综合物探技术在城市轨道交通不良地质体探测中的应用分析  

Application Analysis of Comprehensive Investigation Technology in the Detection of Unfavorable Geological Bodies in Urban Railway Engineering

作　　者：李应战 计鹏 张德强 雷凯 Li Yingzhan;Ji Ping;Zhang Deqiang;Lei Kai(Guangzhou Investment and Construction Co.,Ttd,China Railway Group Limited,Guangzhou Guangdong 510000,China;Survey Institute,China Railway LiuYuan Group Co.,Ltd.,Tianjin 300000,China)

机构地区：[1]中国中铁股份有限公司广州投资建设有限公司,广东广州510000 [2]中铁第六勘察设计院集团有限公司勘察院,天津300000

出　　处：《工程地球物理学报》2023年第4期471-479,共9页Chinese Journal of Engineering Geophysics

基　　金：广州地铁集团有限公司科研项目(编号:HT201421)。

摘　　要：不良地质体将会对地铁施工带来安全风险。由于常规地质钻探不可能做到连续、全面揭露地质情况,必然存在地质空白区和遗漏区,辅以综合物探手段加以查明极其必要。本次研究以广州地铁勘察项目为例,结合前期勘察成果,首先采用微动探测和等值反磁通瞬变电磁法对某地铁分支两处可能发育复合型断裂并与线路相交的区域进行针对性的施工勘察,最终确定了该隐伏分支复合型断裂与在建地铁线路的位置关系。然后采用地震CT(Computed Tomography,CT)和钻孔验证相结合的方式对某线路某车站进行岩溶探测,通过对比分析地震CT与钻探验证成果,得出本次成果划分的基岩面与验证结果基本一致;地震CT成果圈定的溶洞位置和规模(高度)与钻探验证孔实际揭示吻合度较高,误差均在正常范围内。本次研究表明,采用综合勘察技术,可以更有针对性地查明场地内地质情况,优化设计及施工方案,以保证地铁施工和后续运营的安全。Unfavorable geological bodies brings safety risks to metro construction.Due to the discontinuity and incompleteness of conventional geological drilling in revealing stratum,geological blank and missing areas occur frequently.It is extremely necessary to use comprehensive geophysical prospecting methods as supplementary means.This research took Guangzhou metro investigation project as an example.Firstly,we carried out specific investigation during construction on the intersection areas of two possible mixed mode fractures and the metro line,using micro seismic and equivalent reverse magnetic fluxtransient electromagnetic,through which we determined their positional relationship.Then,we detected the krast in the metro line and a station using both seismic CT and drilling.It is proved that the bedrock faces determined by the geophysical prospecting methods are basically the same with the drilling results.The krast location and scale determined by seismic CT are also highly consistent with the drilling results.This research shows that the comprehensive investigation methods are more competent in identifying the geological conditions,thus can optimize the design and construction scheme,ensuring the safety of construction and operation.

关 键 词：不良地质体 微动探测 等值反磁通瞬变电磁 地震CT 综合勘察技术 

分 类 号：P631[天文地球—地质矿产勘探]