|
|
|
| Research on the advanced detection of transient electromagnetic in tunnel construction by TBM |
HU Jia-Hao1( ), LI Xiu1, LIU Hang2, HU Wei-Ming1, YUE Xin1 |
1.College of Geological Engineering and Geomatics, Chang'an University , Xi'an 710061 , China
2.Xi'an Research Institute, China Coal Technology & Engineering Group Corp., Xi'an 710077 , China |
|
|
|
|
Abstract When the tunnel passes through the complex strata with bad geological development, it often encounters geological disasters such as water inrush, mud inrush, collapse and roof fall. During the construction of the tunnel, the advanced geological prediction for the adverse geological disasters such as water and mud inrush has become an important issue to ensure the construction safety. Transient electromagnetic method has been widely used in the prediction of tunnel and underground cavern construction period. However, with the increasingly complex construction environment, the application of traditional TEM is restricted by various factors. For example, in TBM construction tunnel, the traditional transient electromagnetic device form is limited by TBM machinery, and the metal components of TBM produce strong electromagnetic interference to the collection of secondary field attenuation voltage, which makes this kind of method difficult to apply to TBM construction tunnel at present. In order to overcome the difficulties encountered by TEM in TBM tunnel construction, the authors, based on previous work, attempted to put forward a type of TEM advanced detection device based on electrical source excitation and electric field component acquisition. According to the different working conditions of drilling and blasting method and TBM construction tunnel, the three-dimensional finite-difference time-domain method is used to simulate the distribution and response characteristics of transient electromagnetic field in front of the tunnel excited by a single electrical source. Based on the analysis of the distribution and response characteristics of transient electromagnetic field, the authors hold that the single electrical source launching device not only can be used in the tunnel construction by drilling and blasting but also has the capability of advanced prediction in the tunnel construction by TBM.
|
|
Received: 27 December 2019
Published: 26 October 2020
|
|
|
|
|
|
|
Yee cell format used in FDTD calculation
|
|
Schematic diagram of tunnel model
|
|
Layout of transmitting source and receiving point of tunnel face
|
|
Calculation model of TBM
|
|
Schematic diagram of calculation model with TBM
|
|
Electric field distribution in front of 10 μs tunnel model after closure
|
|
Electric field distribution in front of 10 μs TBM model hand after shut down
|
|
Comparison of attenuation curves of electric field Ex、Ey and Ez components of observation points on tunnel face
|
|
10 μs after closing of TBM under different backoff distance distribution of electric field Ex component in xOz plane
|
|
TBM machine with different tool withdrawal decay curve of electric field Ex component
|
|
Schematic diagram of calculation model
|
|
Distance between water bearing fault of TBM construction tunnel and tunnel face abnormal response curve of horizontal component of electric field at different distances
|
|
The water bearing abnormal body is 15 m away from the tunnel face attenuation curve and apparent resistivity of horizontal component of electric field
|
| [1] |
洪开荣. 我国隧道及地下工程发展现状与展望[J]. 隧道建设, 2015,35(2):95-107.
|
| [1] |
Hong K R. Current situation and prospect of tunnel and underground engineering development in China[J]. Tunnel Construction, 2015,35(2):95-107.
|
| [2] |
钱七虎. 地下工程建设安全面临的挑战与对策[J]. 岩石力学与工程学报, 2012,31(10):1945-1956.
|
| [2] |
Qian Q H. Challenges and countermeasures for safety of underground engineering construction[J]. Journal of Rock Mechanics and Engineering, 2012,31(10):1945-1956.
|
| [3] |
李术才, 刘斌, 孙怀凤, 等. 隧道施工超前地质预报研究现状及发展趋势[J]. 岩石力学与工程学报, 2014,33(6):1090-1113.
|
| [3] |
Li S C, Liu B, Sun H F, et al. State of art and trends of advanced geological prediction in tunnel contruction[J]. Chinese Journal of Rock Mechanics and Engineering, 2014,33(6):1090-1113.
|
| [4] |
赵永贵, 刘浩, 孙宇, 等. 隧道地质超前预报研究进展[J]. 地球物理学进展, 2003,18(3):460-464.
|
| [4] |
Zhao Y G, Liu H, Sun Y, et al. Advance in advance prediction of tunnel geology[J]. Progress in Geophysics, 2003,18(3):460-464.
|
| [5] |
孙怀凤. 隧道含水构造三维瞬变电磁场响应特征及突水灾害源预报研究[J]. 岩石力学与工程学报, 2015,34(3):648.
|
| [5] |
Sun H F. Three dimensional transient electromagnetic field response characteristics of tunnel water bearing structure and prediction of water inrush disaster source[J]. Journal of Rock Mechanics and Engineering, 2015,34(3):648.
|
| [6] |
薛国强, 李貅. 瞬变电磁隧道超前预报成像技术[J]. 地球物理学报, 2008,51(3):894-900.
|
| [6] |
Xue G Q, Li X. Advanced prediction imaging technology of TEM tunnel[J]. Journal of Geophysics, 2008,51(3):894-900.
|
| [7] |
孙怀凤. 隧道瞬变电磁三维探测[C]// 中国地球物理学会第二十七届年会论文集.中国地球物理学会, 2011.
|
| [7] |
Sun H F. Three dimensional detection of transient electromagnetic in tunnel[C]// Proceedings of the 27th Annual Meeting of China Geophysical Society. China Geophysical Society, 2011.
|
| [8] |
李貅. 瞬变电磁测深的理论与应用[M]. 西安: 陕西科学技术出版社, 2002.
|
| [8] |
Li X. Theory and application of TEM sounding [M]. Xi’an: Shaanxi Science and Technology Press, 2002.
|
| [9] |
陈卫营, 薛国强, 崔江伟. 电性源瞬变电磁发射源形变对观测结果影响分析[J]. 地球物理学进展, 2015,30(1):126-132.
|
| [9] |
Chen W Y, Xue G Q, Cui J W. Analysis of the influence of the deformation of the transient electromagnetic emission source of the electric source on the observation results[J]. Progress in Geophysics, 2015,30(1):126-132.
|
| [10] |
卢绪山. 隧道TBM机瞬变电磁响应三维并行模拟及干扰去除研究[D]. 西安:长安大学, 2014.
|
| [10] |
Lu X S. Three dimensional parallel simulation of transient electromagnetic response of tunnel TBM and study of interference removal [D]. Xi'an: Chang’an University, 2014.
|
| [11] |
孙怀凤. 隧道含水构造三维瞬变电磁场响应特征及突水灾害源预报研究[D]. 济南:山东大学, 2013.
|
| [11] |
Sun H F. Three dimensional transient electromagnetic response characteristics of tunnel water bearing structure and prediction of water inrush disaster source[D]. Jinan:Shandong University, 2013.
|
| [12] |
葛德彪, 闫玉波. 电磁波时域有限差分方法(第三版)[M]. 西安: 西安电子科技大学出版社, 2011.
|
| [12] |
Ge D B, Yan Y B. Finite difference time domain method of electromagnetic wave (Third edition)[M]. Xi’an: Xi’an University of Electronic Science and Technology Press, 2011.
|
| [13] |
Yee K S. Numerical solution of initial boundary value problems involving Maxwell’s equations[J]. IEEE Trans. Antennas Propag, 1966,14(3):302-307.
|
| [14] |
戚志鹏, 智庆全, 李貅, 等. 隧道瞬变电磁任意点垂直分量全域视电阻率解释方法[J]. 岩石力学与工程学报, 2015,34(7):1426-1434.
|
| [14] |
Qi Z P, Zhi Q Q, Li X, et al. Interpretation method of global apparent resistivity of vertical component at any point of tunnel transient electromagnetic field[J]. Journal of Rock Mechanics and Engineering, 2015,34(7):1426-1434.
|
| [15] |
张莹莹, 李貅, 姚伟华, 等. 多辐射场源地空瞬变电磁法多分量全域视电阻率定义[J]. 地球物理学报, 2015,58(8):2745-2758.
|
| [15] |
Zhang Y Y, Li X, Yao W H, et al. Definition of multicomponent global apparent resistivity of multi radiation field source ground air transient electromagnetic method[J]. Journal of Geophysics, 2015,58(8):2745-2758.
|
|
|
|
