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  • Table of Content
      10 November 2012, Volume 36 Issue S1 Previous Issue    Next Issue
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    THE APPLICATION OF SMALL COAL PIT GOAF GEOPHYSICAL TECHNOLOGY TO THE RAILWAY ENGINEERING GEOLOGICAL EXPLORATION
    LI Jian
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 1-6.  
    Abstract   HTML   PDF (1522KB) ( 588 )
    Synthesizing such factors as actual situation of exploration stage, detection depth and detection precision, the authors tentatively discuss the choice and combination of geophysical methods, analyze characteristics of various methods, and sum up the anomaly features reflected by data obtained by various geophysical methods which correspond to coal pit goaf.By utilization of a single geophysical method or integrated geophysical technology in combination with geological and drilling data, we can recognize the development stage of the small coal pit goaf and guide the deployment of the drill holes, thus partially or quite macroscopically solve the problem of detecting small coal pit goaf. In addition, according to geophysical data, we can evaluate the engineering conditions of the goaf.
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    THE APPLICATION OF CONTROLLABLE SOURCE AUDIO MAGNETIC METHOD TO DETECTING GOAF IN COAL MINE
    JIA Yong-mei, YAO Cheng-lin, DENG Zhong-jun, FANG Chun-gang, WANG Hui-bin, LI Liang-jing, LI Yuan-qiang
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 7-11.  
    Abstract   HTML   PDF (2184KB) ( 762 )
    This paper deals with an example of detecting coal mine goaf by using controllable source audio magnetic technique (CSAMT). The following aspects are discussed:the working principle of CSAMT,the geophysical premise of detecting coal mine goaf,the equipment and its parameter setting,the working field layout and the data analysis. The result of the study was verified by drilling. Drilling verification shows that the detecting result is coincident with the coal mine goaf. It is thus held that the CSAMT is effective in detecting coal mine goaf.
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    THE APPLICATION OF HIGH DENSITY METHOD TO THE EXPLORATION OF COALFIELD GOAF
    YANG Jing-ming
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 12-15.  
    Abstract   HTML   PDF (1124KB) ( 752 )
    The high density resistivity method was used to investigate coalfield goaf in a certain expressway construction site to obtain the visual resistance ratio 2D imaging drawing of the surveyed area.The anomaly and the high and low resistance of the 2D imaging drawing were analyzed, and the distribution area and burial depth of the underground goaf were inferred. It is concluded that the result is consistent with the drilling data, that the high-density resistivity methods are effective in detecting the coalfield goaf.
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    A TENTATIVE DISCUSSION ON DETECTION TECHNOLOGY OF COAL SEAM GOAF IN A TUNNEL
    WU De-sheng, WU Feng-shou, SU You-cai, HUA Xiao-ming, LI Cang-song
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 16-19.  
    Abstract   HTML   PDF (825KB) ( 524 )
    This paper first describes the adverse effect of coal seam goaf in tunnel on tunnel construction and operation, and then compares advantages and disadvantages of various geophysical technologies in the light of specific work space of the tunnel. GPR technology which has a strong anti-interference capability and high efficiency is adopted to detect the coal seam goaf. Combined with several engineering examples, this paper analyzes the coal seam goaf detection in high risk tunnel by using GPR technology, and verifies the validity and accuracy of GPR.
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    RESEARCH ON INTEGRATED GEOPHYSICAL EXPLORATION FOR RAILWAY SURVEY IN COAL MINE GOAF
    LI Zhi-hua
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 20-26.  
    Abstract   HTML   PDF (2446KB) ( 583 )
    The railway survey in goaf area always faces such problems as tight schedule, high accuracy and high cost. The author preliminarily summed up the effective methods and models after years of research and practice, studied the advantages and disadvantages of various kinds of geophysical methods which were used for anomaly of the object body, and the detection depth and the anti-industrial stray current interference by taking into account the effect and efficiency. These methods and models can solve the problem of the distribution of the goaf. A large quantity of deep drilling work can be reduced, and reliable technical information can be provided for railway line selection and processing. The integrated geophysical technology has become the preferred technology for solving the engineering geological problems of the goaf area.
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    A COMPARATIVE STUDY OF CHARACTERISTICS OF COMPOSITE GEOPHYSICAL ANOMALIES IN DETECTION OF MULTI-LAYER COAL GOAF
    TANG Shi-geng
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 27-33.  
    Abstract   HTML   PDF (1463KB) ( 592 )
    The application of geophysical exploration method to the detection of multi-layer goaf has long been a difficult problem. The multi-layer distribution of the goaf leads to very complex underground media structure, and surface and rock deformation also result in such irregular changes of the media layer as cracks, collapses and water filling. All these phenomena cause great technological difficulties for the geophysical exploration based on differences in media. With practical examples, the author made a comparative analysis of the utilization of geophysical exploration to detect anomaly characteristics of the multi-layer goaf and got some understanding, which was then used in practical exploration work, with satisfactory results obtained.
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    A DISCUSSION ON GEOPHYSICAL METHODS AND TECHNOLOGIES FOR DETECTING GOAF
    WANG He-yu
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 34-39.  
    Abstract   HTML   PDF (2768KB) ( 762 )
    Goaf is bringing serious harm to human's production and life, and therefore detection of goaf has become an important research topic. This paper describes geophysical characteristics of the goaf and geophysical methods (electrical method, seismic method, radioactive method) for detection of goaf in combination with practical examples, and discusses the research status and existing problems of the above three methods as well as the research and development trends in future.
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    THE EVALUATION OF TEM ANTI-INTERFERENCE MEASURES IN DATA ACQUISITION
    WU Jun-Jie, WANG Xing-Chun, DENG Xiao-Hong, LV Guo-Yin, ZHANG Jie, YANG Yi
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 40-44.  
    Abstract   HTML   PDF (955KB) ( 479 )
    Anti-interference measures must be adopted in coalfield where noise level is heavy to guarantee the quality of data collected. The evaluation of parameters is necessary for understanding the effectiveness of the measures. TEM S/N and its calculation method are given in this paper to evaluate the effectiveness of the anti-interference measures. The TEM S/N data were statistically analyzed by using field data processed with different measures, and the result shows that the S/N parameter can display the effectiveness reasonably and the calculation is easy.
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    THE APPLICATION OF PRECISE HIGH DENSITY RESISTIVITY METHOD TO THE DETECTION OF GOAF IN A DOLOSTONE MINE
    SU Zhao-feng, CHEN Chang-yan, XIAO Min, JIA Hui, BAI Zhao-xun
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 45-47.  
    Abstract   HTML   PDF (589KB) ( 419 )
    Small-distance precise high density resistivity method was adopted and symmetric quadrupole device was chosen to detect the goaf in a certain dolostone mine. As a result, the position of the shatter zone was clearly detected, and the affecting range and depth of the goaf were delineated satisfactorily. All these achievements demonstrate the feasibility and practicability of applying high density resistivity method to detecting the goaf.
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    APPLICATION OF SAMPLING FREQUENCY AND PHASE PARAMETEROF CONTROLLED-SOURCE AUDIOMAGNETOTELLURICS
    LIU Ming, WANG Dong-hua, LI Bo
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 48-50.  
    Abstract   HTML   PDF (523KB) ( 538 )
    In the survey of goaf of coal mine, electromagnetic exploration tends to appear superficial blind area. According to the principle of electromagnetic wave propagation and Bostick depth relation, calculate the exploration depth of different strata, at the same time introduce the application effect of the phase parameters in surveying fracture structure. Application results show that selecting reasonablely frequency of data acquisition, can overcome shallow blind area. And apply, including phase parameters, the multi parameter to analysis worked-out position, the effect is obvious.
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    A COMPARATIVE STUDY OF THREE KINDS OF GEOPHYSICAL METHODS IN EXPLORATION OF GOAF IN THE JINCHENG COAL MINE
    ZHAO Ming-xuan, MA Hui-zhen, XIN Yong-qi
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 51-56.  
    Abstract   HTML   PDF (1286KB) ( 711 )
    The authors selected three kinds of methods(transient electromagnetic method,controlled source frequency magnetotelluric method and radon gas survey)to conduct large quantities of experiments in the goaf exploration of the Jincheng coal mine. On the basis of exploration effects, the advantages and disadvantages as well as the applicable scope of the three methods were summarized, which is helpful to method selection in goaf exploration in the future.
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    SIMULATION ERROR OF RECTANGULAR-LOOP BY CIRCULAR-LOOP IN TRANSIENT ELECTROMAGNETIC SURVEY
    ZHOU Nan-nan, XUE Guo-qiang
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 57-60.  
    Abstract   HTML   PDF (532KB) ( 440 )
    Rectangular-loop has been used widely for its easy arrangement. However, there is no analytic solution for rectangular loop. Traditionally, the response of rectangular loop is calculated by circular loop. This paper analyzes the error which may be caused by this simulation for rectangular loop by circular loop in the light of primary field and induced secondary field. Especially, the secondary field of circular-loop and rectangular-loop is calculated by means of hyper-geometric distribution function and superposed electric-dipole, whose superposition principle is controlled by superposition coefficient. Lastly, this paper presents the comparison result, which enhances the quantitative understanding of this simulation.
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    APPLICATION OF MICRO-GRAVITY METHOD IN SURVEY OF GOAF
    WANG Yan-tao, PAN Rui-lin
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 61-64.  
    Abstract   HTML   PDF (602KB) ( 484 )
    Yuli coal mine and Yancun coal mine is the mining information blind area, The electromagnetic and the seismic method is not suitable for exploration goaf, due to the Wangzhuang coal mine, Zhangze Power Plant, high voltage corridor, Changzhi-Handan highway. As a result of mining rock density difference, microgravity is suitable for exploration goaf. The field verification, drilling and mining rock movement deformation analysis, and exploration results consistent. Gravity anomaly zone in goaf evenly sink area exists in the rock mass deformation. With this method, the mining boundary are explored, offering convenient and effective exploration means for exploration goaf.
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    THE APPLICATION OF SEISMIC ATTRIBUTES TECHNOLOGY TO THE INTERPRETATION OF GOLF IN COAL FIELD
    SHEN You-yi, LIU Hai-ping
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 65-69.  
    Abstract   HTML   PDF (3509KB) ( 551 )
    With the Xiangning ore district of the Hedong coalfield as an example and on the basis of an analysis of the geological conditions, geophysical characteristics and the seismic attributes responses, the author selected several seismic attributes that are relatively sensitive to the golf of coalfield from more than twenty attributes, such as average amplitude energy value, ratio of positive to negative peak amplitudes, maximum reflectance, instantaneous frequency and instantaneous phase, thus obtaining ideal result in the interpretation of golf in coalfield.
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    THE INFLUENCE OF THE TYPE AND PAREMETERS OF THE RECODING GEOMETRY ON GOAF DETECTION
    TIAN Wei, CHANG Suo-liang, CHEN Qiang
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 70-77.  
    Abstract   HTML   PDF (4677KB) ( 442 )
    The design of conventional coal mine three-dimensional seismic exploration observation system focuses its attention on saving acquisition cost and improving efficiency of construction,and hence often uses narrow azimuth half beam line horizontal scrolling observation way;nevertheless,for coal mine fine structure exploration in irregularly-developed goaf,the prospecting effect remains doubtful.On the basis of the ray tracing algorithm for three-dimensional goaf numerical model forward based on an analysis of the observation effects of different observation systems in such aspects as acquisition of footprints,azimuth distribution,and target goaf lighting degree,the authors carried out detailed comparison.The analytical results of six kinds of observation systems and nine kinds of attributes show that the wide azimuth 45° oblique type observation system has obvious advantages in five aspects,and its anomaly response to the geological target of the goaf is the best.
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    THE DETECTION OF GOAF BASED ON SEISMIC ATTRIBUTE ANALYSIS TECHNOLOGY AND ITS APPLICATION
    ZENG Wei-wang, XU Yu-ying, CHENG Yue
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 78-82.  
    Abstract   HTML   PDF (1100KB) ( 438 )
    With the existing information of the goafs and 3D seismic prospecting data,combined with the geophysical characteristics of the goafs,the authors performed technological extraction and comprehensive analysis of various attributes in one of the working areas in Linfen,Shanxi Province.Variance,three instantaneous parameters information,structure and root mean square were selected,which can effectively highlight the anomaly of the mined-out area,with the structure attributes being most important.A comparison with surface properties shows that the body properties are more reliable in qualitative interpretation of the mined-out area.
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    THE APPLICATION OF GEOPHYSICAL EXPLORATION TECHNOLOGY TO THE DETECTION OF COAL MINE GOAF
    ZHANG Shu-ting
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 83-87.  
    Abstract   HTML   PDF (1219KB) ( 609 )
    Based on a description of characteristics of the goaf and other geophysical anomaly fields, this paper emphatically deals with four ground geophysical exploration technologies, i.e., transient electromagnetic method, reflection wave method, ground penetrating radar method and EH4 magnetotelluric method, and, in combination with practical engineering examples, sums up the application effects as well as advantages and disadvantages of these technologies. Studies show that these methods have such superiorities as high resolution, low cost, rapidness, high accuracy and effectiveness, and can provide guiding data for safe production of the coal mine.
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    THE APPLICATION OF HIGH DENSITY RESISTIVITY METHOD AND SHALLOW SEISMIC TECHNIQUE TO DETECTING GOAF IN THE COAL MINE
    SUN Lin
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 88-91.  
    Abstract   HTML   PDF (948KB) ( 583 )
    The choice of appropriate test methods in survey of goaf must be suitable for different ground conditions. The authors conducted goaf exploration in a coal mine of Inner Mongolia by using the high density resistivity method and shallow seismic comprehensive geophysical prospecting method. The results show that the two geophysical methods are effective in the comprehensive detection of the coal goaf area.
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    THE APPLICATION OF TRANSIENT ELECTROMAGNETIC METHOD TO THE DETECTION OF COAL MINE GOAF AND COLLAPSE AREAS
    QIE Wei-dong
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 92-95.  
    Abstract   HTML   PDF (1487KB) ( 476 )
    The transient electromagnetic method was used to detect goaf and collapse areas in the Xiangyuan coal field. The effectiveness tests on the method were made both in the known goaf and non-mined out area. The author found that the low resistivity anomaly in the working area is the reflection of the waterlogged goaf. In combination with data available, the author has judged that the mined-out depth of the minable coal seam (No.3 coal seam) is 144~324 m, being relatively shallow on the eastern side and comparatively deep on the wesetern side, which is consistent with the dip of the coal seam. Horizontal section of apparent resistivity was made at the burial depth of 260m in No.3 coal seam. In combination with anomaly conditions along various survey lines, the author inferred the limits of the goaf, and preliminarily found out the factors responsible for such geohazards as cracks in house and land subsidence.
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    A COMPARATIVE STUDY OF INTEGRATED GEOPHYSICAL METHODS IN THE DETECTION OF COAL MINE GOAF
    HE Jin, ZHANG Ya-feng, WEI Jian-jiang
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 96-101.  
    Abstract   HTML   PDF (3268KB) ( 531 )
    Based on a comparative study of the effects of various geophysical exploration methods over the known goaf of the Shuiquan coal mine run by China Coal Corp., this paper sums up the response characteristics of these methods under the same geoelectric conditions, generalizes three kinds of anomalies in goaf of the working area, points out the optimal combination of the geophysical exploration methods, and suggests reciprocal verification of integrated geophysical exploration methods in the detection of goaf.
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    THE APPLICATION OF INTEGRATED GEOPHYSICAL EXPLORATION METHODS TO THE DETECTION OF GOAF AND ITS WATER LOG SITUATION
    HAO Zhi-guo, JIA Shu-lin, WEN Qun-lin
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 102-106.  
    Abstract   HTML   PDF (1290KB) ( 771 )
    The study ore district is an integrated mine, whose excavation situation is rather complex. The authors thus put forward the systematic methods which combine surface geophysical exploration with downhole geophysical exploration so as to detect the goaf and its water log situation. First, three-dimensional seismic exploration is employed to detect the development of coal seam and structures in the ore district, accompanied by the delineation of anomaly distribution in the goaf. On such a basis, surface electric methods such as transient electromagnetic method and high-density electric method are emphatically used near the anomaly district to verify the existence of goaf and investigate the water-bearing and transmissivity situation of the goaf and structures. Then, downhole transient electromagnetic method is utilized to accurately locate the downhole anomaly near the goaf waterlogged area delineated by surface methods. The systematic application of the above-mentioned methods not only guarantees the high-efficiency production of the mine but also realizes the precise exploration of coal resources and emphatic detection of the goaf and its water quantity as well as effective reduction of downhole advanced drilling workload. Therefore, it has fairly reasonable technical and economic properties and is suitable for widespread application in the mine whose underground excavation situation is relatively complex.
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    THE APPLICATION OF HIGH DENSITY RESISTIVITY METHOD AND TRANSIENT ELECTROMAGNETIC METHOD TO THE DETECTION OF COAL MINE GOAF
    HUANG Qun
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 107-110.  
    Abstract   HTML   PDF (608KB) ( 523 )
    There occurs large-area mined-out and collapse district in a certain place along the high mountain section of the ‘Cloud' branch line. In order to guarantee the transport safety, the author conducted effectiveness test of the method following the principle of "from known to unknown" and determined the exploration method and work parameters. The d. c. high-density electrical sounding method characterized by high efficiency and good detection effect was mainly employed, with the assistance of transient electromagnetic method in some favorable places so as to further determine the limits and properties of the anomaly district. Practice shows the integrated application of geophysical exploration methods can guarantee the reliability of the interpretation result and improve the precision of geophysical interpretation.
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    GEOLOGICAL EXPLORATION IN GOAF AND COLLAPSE AREAS IN SMALL COAL PITS
    XUE Yong-jun, WU Xiu-fang, ZHONG Cong-ming, LI Yu-lin
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 111-113.  
    Abstract   HTML   PDF (581KB) ( 1492 )
    The geophysical technology combining transient electromagnetic method and high density electric method was adopted to make exploration in goaf and collapse areas of shallow small coal pits in Mentougou District of Beijing. Well positions were arranged according to geophysical exploration results, and drilling verification of anomaly areas and normal areas was conducted, which proved the effectiveness of the technology.
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    MONITORING WATER-FILLED GOAF BY USING TEM TECHNOLOGY
    GUO Wei-li, XUE Guo-qiang, ZHOU Nan-nan, XIAO Hong-yao
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 114-118.  
    Abstract   HTML   PDF (1598KB) ( 453 )
    Central-loop TEM sounding was carried out three times, and TEM soundings over the buried goaf was interpreted. The interpretation results show that the limits of the goaf are enlarged with time. The surface sink and the cracks detected demonstrate that the power building is in an unstable state. With the transient electromagnetic method, we can rapid obtain the electric information of strata in shallow or even great depth, interpret geological problems ideally, and get satisfactory detection result.
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    GEOPHYSICAL DETECTION METHOD ON STONE ARCH BRIDGE DISEASE TREATMENT ENGINEERING
    LIU Di, LI He
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 119-123.  
    Abstract   HTML   PDF (1747KB) ( 305 )
    Trough disease treatment project of a stone arch bridge, which located from Guanyin Mountain to Qinshiya of Bao-Cheng line, the authors introduced geophysical detection method on stone arch bridge disease treatment. The stone arch bridge by using ultrasonic wave method and the CT method detection. The ultrasonic method for this kind of stone structure in bridge detection can obtain very good results. Combined ultrasonic transmission wave and ultrasonic CT method, can better detect stone arch bridge internal disease area position and size, for the treatment of stone arch bridge program provides a strong technical support, but also for the treatment effect detection provides a powerful means.
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    THE APPLICATION OF SEISMIC WAVE EXPLORATION METHOD TO THE DETECTION OF GOAF IN SMALL COAL MINE
    WANG Jun
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 124-127.  
    Abstract   HTML   PDF (1031KB) ( 351 )
    Nowadays, goaf in the small coal mine(GSCM)is dangerous to resources integrated mining. Therefore, it is important to detect this kind of GSCM with suitable seismic geophysical method. In this paper, numerical simulation of GSCM was conducted on the basis of model design, and the response characteristics of GSCM in seismic section were analyzed. It is discovered that the reflection seismic waves phase axis is discontinuous in seismic section when the scale of GSCM is small, whereas the reflection seismic waves phase axis assumes "pseudosyncline" feature when more GSCM are connected together. Two cases of GSCM in Jinchen and Hongtong of Shanxi Province were studied, with satisfactory result achieved.
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    SOME PROBLEMS WORTHY OF ATTENTION IN THE APPLICATION OF SHALLOW EARTHQUAKE TO THE DETECTION OF GOAF
    TANG Shi-geng, XUE Ying
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 128-131.  
    Abstract   HTML   PDF (737KB) ( 484 )
    In the exploration of the coal goaf, shallow earthquakes can be regarded as one of the preferred geophysical methods. Its advantages such as high resolution and good detection results have been widely used in goaf detection, and its superiority is especially obvious in the exploration of multi-layer goaf; nevertheless, its high requirement in field work and difficult data processing as compared with other geophysical methods should be given much careful and prudent attention. Based on previous achievements, the authors present some personal opinions concerning the field acquisition technique and data processing and interpretation of this method.
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    THE FORWARD CALCULATION SYSTEM IN TEM FOR TABULAR BODY
    SU Yan-ping, XUE Guo-qiang, ZHOU Nan-nan, XU Chi-bin
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 132-136.  
    Abstract   HTML   PDF (1180KB) ( 334 )
    A 2D forward system for the layered geological body is developed. With this system, it is convenient to study TEM response. Progress-oriented and object-oriented methods are both used in the programming of this system, which are connected by the DLL files. The system has comfortable interface and stable performance, and can realize the forward calculation of all kinds of tabular bodies. The finite difference method is adopted in the 2D forward to calculate the tabular bodies with different thicknesses, angles and conductances. The results are shown by the way of curve graph which can be conveniently observed and can also be further studied by other graphic software.
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    THE APPLICATION OF SEISMIC EXPLORATION TECHNOLOGY TO INTEPRETING NAPPE OVERTHRUST STRUCTURE IN COALFIELD
    CAO jie
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 137-140.  
    Abstract   HTML   PDF (1311KB) ( 360 )
    In order to find out the strike of F1-2 fault set and the coal seam undulation morphology as well as the structure distribution under its nappe structure in the Weijiadi coal mine of Baiyin City, the author conducted three-dimensional seismic exploration. Taking into account the complex seismic geological conditions of the study area, the author adopted corresponding technical measures for data acquisition and processing and obtained high-quality three-dimensional data. In the process of data interpretation, the means of adopting seismic data interpretation assisted by seismic attribute interpretation was employed. As a result, the interpreted geological and structural characteristics under the nappe overthrust structure are fairly obvious, and the distribution range of the fault coal is delineated.
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    THE APPLICATION OF INTEGRATED GEOPHYSICAL INTERPRETATION TECHNOLOGY TO THE MULTILAYERED MINED-OUT COMPLEX AREA OF THE COALFIELD
    ZHANG Zhao-fang, LI Jing, LIU Hai-jun, JIANG Wen-bo, LI Qing
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 141-145.  
    Abstract   HTML   PDF (1341KB) ( 420 )
    With the increasing amalgamation of the old mines and small mines,geological engineering problems tend to increase,especially the problems related to coal goaf.These geological engineering problems are likely to result in water inrush during mining.Aimed at solving these problems,the authors describe the achievements obtained from the integrated geophysical interpretation of the 3D seismic method,DC topography and controlled source electromagnet data for detecting the multilayered mined-out complex area.With an exploration example,the practical effects of these technologiesy are also discussed in this paper.
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    THE APPLICATION OF PRE-STACK TIME MIGRATION TECHNOLOGY TO COALFIELD SEISMIC DATA PROCESSING IN STRUCTURALLY-COMPLEX AREA
    WANG Jun, DU Qi-wei, NIU Xiao-cheng
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 146-149.  
    Abstract   HTML   PDF (2446KB) ( 304 )
    The pre-stack time migration technology is one of the effective means for imaging of complex structure.It can be adapted to the condition of relatively rapid longitudinal and transverse variation and is suitable for migration imaging with large dip angles.With examples,the authors discuss the problems which deserve attention in using the pre-stack time migration technology to conduct coalfield seismic data processing in the structurally-complex area.The results demonstrate that this technology can effectively improve imaging effect of coal seams in structurally-complicated areas and raise coalfield seismic data signal-to-noise ratio and resolution.
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    A TENTATIVE DISCUSSION ON THE FEASIBILITY OF APPLYING INTEGRATED GEOPHYSICAL EXPLORATION METHODS TO DETECTING UNDERGROUND TUNNELS
    HU Ben-na, LIU Guo-hui, MIAO Jing-chun
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 150-153.  
    Abstract   HTML   PDF (1171KB) ( 400 )
    In the light of special site conditions and interference environment of the city,the authors carried out the feasibility study of applying integrated geophysical exploration methods to detecting underground tunnels,put forward a new combined model for integrated geophysical exploration and deeply studied the feasibility and the complementary role.Practice shows that the combination of the integrated geophysical methods can meet the detection accuracy of the urban underground tunnel,and also has the advantages of suppressing interference from the city.It is proved that this combination is effective.
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    THE APPLICATION OF SEISMIC WAVE CT TO GROUTING DETECTION
    MAO Xing
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 154-157.  
    Abstract   HTML   PDF (769KB) ( 337 )
    The seismic wave CT(Computerized Tomography) is a high resolution geophysical method containing abundant information,and hence it is very suitable for engineering geological exploration.Grouting filling,as a goaf treatment scheme,has been used frequently in recent years.Owing to the considerable uncertainty of the grouting slurry position and reinforcement effect after the grouting treatment,it is difficult to conduct quality examination on the basis of traditional sampling and compactness methods.Due to its own advantage,seismic wave CT has become a suitable choice for grouting quality detection,and it has achieved good results in practical applications.
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    THE APPLICATION OF PRECISE PROCESSING TECHNIQUE FOR TRANSIENT ELECTROMAGNETIC DATA TO DETECTION OF GOAF IN COAL MINE
    RU Liang, ZHONG Wei-jie, ZHU Yu-zhen, SHEN Li-feng, ZHOU Ming-lei
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 158-160.  
    Abstract   HTML   PDF (702KB) ( 405 )
    This paper presents the principle and characteristics of transient electromagnetic longitudinal conductivity differential imaging and the processes of the software for longitudinal conductivity differential imaging to process the transient electromagnetic data. Experimental exploration was carried out in some coal mines in Henan Province. The low resistivity area was inferred and delineated, and the method was compared with the traditional method of apparent resistivity imaging. The results indicate that the software used in this study has the features of faster processing speed, intuitive imaging, higher interpretation accuracy.
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    THE APPLICATION OF SEISMIC CT TECHNOLOGY IN THE EXPLORATION OF COALFIELED MINED-OUT AREA OF LONG-PAI-CHONG TUNNEL
    CAO Yun-yong
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 161-163.  
    Abstract   HTML   PDF (1369KB) ( 325 )
    The frequent collapse incidents of coalfield mined-out areas in recent years have severely threatened the safety and security of life and property,as well as those of railway construction.As a result,it is of great significance to search out the buried depth,location and spatial extension scope of coalfield mined-out areas for better instructions and management.This paper intends to briefly explain the principles of seismic computerized tomography in the first place,then discuss the applied effects of seismic tomography in combination with railway construction cases.
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    THE APPLICATION OF TRANSIENT ELECTROMAGNETIC METHOD TO THE DETECTION OF GOAF AND COLLAPSE COLUMNS
    YUAN Wen-tao
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 164-167.  
    Abstract   HTML   PDF (1051KB) ( 404 )
    This paper details with topography, surface water and geology of the study area. The results provide a basis for the choice of detection methods. Based on electrical property of the detection area, the authors hold that TEM is well suitable for the study of the detection area. The authors compared and analyzed the parameters of resistivity and found that the stratigraphic physical character differences could effectively determine the distribution of water log in goaf and collapses columns, thus guaranteeing safe production.
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    THE APPLICATION OF TRANSIENT ELECTROMAGNETIC METHOD TO THE EXPLORATION OF COAL MINE GOAF
    WU Jun-lin, JIN Yue-wen
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 168-170.  
    Abstract   HTML   PDF (888KB) ( 515 )
    This paper mainly describes the application of the transient electromagnetic method to the exploration of coal goaf, and compares the effects of different loop line devices in the practical engineering work. The results show that the transverse resolution of the coincident loop device is higher, with the detecting depth reaching hundreds of meters, whereas the large fixed source line device can detect deep information and divide anomalies quite in detail.
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    THE APPLICATION OF THE TRANSIENT ELECTROMAGNETIC METHOD TO LOCATING THE INFLUENCE RANGE OF COALFIELD GOAF
    LI Lian-ying
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 171-174.  
    Abstract   HTML   PDF (1009KB) ( 347 )
    In view of the existence of quite a few house cracks in villages and periphery of the surveyed area, the authors tried to find out whether there exists a goaf and whether the cracks are caused by the goaf. Data obtained by transient electromagnetic method were used in combination with geological and digging conditions of the mining district to infer the influence range of the goaf. It is held that the cracks in houses in villages and periphery are caused mainly by the goaf.
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    THE APPLICATION OF CHARACTERISTICS OF REFLECTION WAVE IN SEISMIC TIME PROFILE TO INTERPRETING COAL MINE GOAF
    HAN Shao-ming
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 175-177.  
    Abstract   HTML   PDF (712KB) ( 337 )
    At present, coal resources in Shanxi Province are being reformed, and the resource reserves will be checked after the merging of small coal pits. It is necessary to investigate the structure of the goaf that threats mine production,so as to get rid of hidden danger. Through a comparative study during data processing, the author has discovered that reflection seismic wave phase axis is concave downward, interrupted, and discontinued or interruptedly-continuous in the seismic section if the goaf is buried. In this paper, the goaf is interpreted by using seismic time section reflection wave feature. The result of seismic exploration for the goaf is as follows: totally seven 3#-coal goaf areas have been discovered,the total goaf area is 0.808 km2,and the limits of three goaf areas agree with the drilling data,which means that the interpretation result is well verified by drilling data.
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    THE APPLICATION OF THREE-DIMENSIONAL EXPLORATION TECHNOLOGY TO INTERPRETING COALFIELD GOAF
    CAO Li-Dan
    Geophysical and Geochemical Exploration. 2012, 36 (S1): 178-179.  
    Abstract   HTML   PDF (449KB) ( 459 )
    With the exploitation of the coal seam during coal production,more and more underground goaf areas will occur,and the geophysical properties of the goaf and its overlying strata will obviously change correspondingly.Seismic exploration can effectively distinguish structures with obvious differences in physical character.Using the three-dimensional seismic exploration technology,the author analyzed the reflection wave characteristics of the goaf,summed up the factors affecting the resolution in seismic data acquisition and the key technique for goaf data processing.Exploitation verification shows that the three-dimensional seismic technology is feasible and effective in goaf exploration.
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