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物探与化探  2021, Vol. 45 Issue (3): 785-792    DOI: 10.11720/wtyht.2021.1124
  工程勘察 本期目录 | 过刊浏览 | 高级检索 |
综合物探方法在株洲湘江大桥勘察中的应用
李谭伟(), 李振兴, 葛延明, 邬远明
湖南省交通规划勘察设计院有限公司,湖南 长沙 410219
The application of comprehensive geophysical prospecting method to the investigation of Xiangjiang bridge in Zhuzhou
LI Tan-Wei(), LI Zhen-Xing, GE Yan-Ming, WU Yuan-Ming
Hunan Provincial Communications Planning,Survey & Design Institute Co.,Ltd.,Changsha 410219,China
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摘要 

岩溶发育地区地质条件复杂,地质情况直接影响桥梁设计方案。株洲湘江大桥桥区岩溶强烈发育,在综合研究该区地形地貌特征和地质情况的基础上,为查明桥址区及各桥墩位置深部岩溶发育类型、规模,勘察中采用了高密度电法、大地电磁、水上浅层地震和孔间弹性波CT进行探测。异常区钻孔验证结果显示,探测结果准确可靠,表明综合物探方法应用于桥址勘察是准确、有效的。调整了桥梁跨径布置方案及桩基基础奠基高程,使布跨和桩长更合理,成功避开岩溶,实现了地质优先,择地建桥的桥梁设计方案。

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李谭伟
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葛延明
邬远明
关键词 综合物探弹性波CT岩溶发育桥梁勘察    
Abstract

The geological conditions in the karst-developed area are complicated.The geological conditions directly affect the bridge design plan.On the basis of comprehensive research on the topographic and geomorphological characteristics and geological conditions of the bridge area of the Xiangjiang River Bridge in Zhuzhou and with the purpose of ascertaining the type and scale of karst development in the bridge site area and the location of each bridge pier,the authors used such means as high-density electrical method,magnetotelluric survey,shallow water earthquake and CT between holes in the survey.Verification results in the anomalous area show that the detection results are accurate and reliable,indicating that the integrated geophysical method is accurate and effective for bridge site survey.The bridge span layout scheme and pile foundation laying height were adjusted to make the layout span and pile length more reasonable,thus successfully avoiding karst,realizing the geological priority and forming the bridge design scheme for site selection.

Key wordscomprehensive geophysical survey    elastic wave CT    karst development    bridge survey
收稿日期: 2020-03-16      修回日期: 2021-01-13      出版日期: 2021-06-20
ZTFLH:  P631.4  
基金资助:湖南省交通规划勘察设计院有限公司自主研发项目“多级断裂控制岩溶条件下库区特大公路桥梁勘察关键技术研究”
作者简介: 李谭伟(1988-),男,工程师,注册土木工程师(岩土),主要从事工程物探、工程勘察工作。Email: 409905310@qq.com
引用本文:   
李谭伟, 李振兴, 葛延明, 邬远明. 综合物探方法在株洲湘江大桥勘察中的应用[J]. 物探与化探, 2021, 45(3): 785-792.
LI Tan-Wei, LI Zhen-Xing, GE Yan-Ming, WU Yuan-Ming. The application of comprehensive geophysical prospecting method to the investigation of Xiangjiang bridge in Zhuzhou. Geophysical and Geochemical Exploration, 2021, 45(3): 785-792.
链接本文:  
https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2021.1124      或      https://www.wutanyuhuatan.com/CN/Y2021/V45/I3/785
Fig.1  工作区区域地质构造简图
介质 电阻率/(Ω·m) 纵波波速/(km·s-1)
<100 0.9~2.2
粗砂 10~103 0.5~2
卵石 3×102~6×103 1.4~2.5
砾岩 10~104 1.6~4.2
灰岩 102~104 3.4~6.1
岩溶水 <300 1.4~2.6
Table 1  测区主要地下介质物性参数范围
Fig.2  测区及测线布置示意
Fig.3  弹性波CT探测平面
Fig.4  大地电磁剖面D1-D1'异常解释
Fig.5  浅层地震剖面Q1-Q1'异常解释
Fig.6  高密度电法剖面G1-G1'异常解释
Fig.7  孔间弹性波CT成像及地质解释
Fig.8  综合物探推断解释平面
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