电测深联合剖面法在高铁路基岩溶探测中的应用  

Combined Electrical Sounding Profile Method in the High-speed Railway Detecting Karst of Subgrade

作　　者：刘瑞军[1] LIU Ruijun(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063

出　　处：《铁道勘察》2024年第3期89-95,共7页Railway Investigation and Surveying

基　　金：国家重点研发计划项目(2019YFC0605101);湖北省重点研发计划项目(2021BAA050)。

摘　　要：采用电测深联合剖面法,对新建莱荣高铁路基岩溶进行综合勘探。该方法结合电测深与联合剖面法的特点,通过测量地下岩层的电性分布,从而准确反映岩溶的位置和形态,且具有横向分辨率高和纵向探测深度可计算等显著优点。将电测深低阻凹陷及联合剖面双线交叉点重叠的位置推测为岩溶发育区,适用于类似地质条件下的路基岩溶探测。探测结果显示,DK11+352~DK11+750段电阻率介于240~560Ω·m,电测深联合剖面法岩溶探测准确率为86.7%;DK11+750~DK12+025段电阻率介于320~1000Ω·m,电测深联合剖面法岩溶探测准确率为50%;路基岩溶综合探测结果准确率为75%。研究结果表明,电测深联合剖面法在路基岩溶探测方面具有较高的精度,为高铁路基岩溶探测提供一种较好的解决方案。The electrical sounding combined profile method was used to conduct comprehensive exploration of the karst in the subgrade of the newly built Laixi-Rongcheng High-speed Railway.The method combines the characteristics of electrical sounding and joint profiling.By measuring the electrical distribution of underground rock strata,it can accurately reflect the location and morphology of karst.It also has significant advantages such as high lateral resolution and calculable longitudinal detection depth.The overlapping position of the low-resistance depression of the electrical sounding and the crossover point of the joint profile were presumed to be the karst development area,which was suitable for the detection of subgrade karst under similar geological conditions.Detection results shows that the resistivity of DK11+352~DK11+750 segment ranges from 240 to 560Ω·m,and the accuracy of karst detection by the electrical sounding combined profile method is 86.7%.The resistivity of DK11+750~DK12+025 segment rangs from 320 to 1000Ω·m,and the accuracy of karst detection by the electrical sounding combined profile method is 50%.The accuracy of comprehensive detection results of subgrade karst is 75%.The results show that the electrical sounding combined profile method has high accuracy in detecting subgrade karst,which provides a better solution for detecting karst in high-speed railway subgrade.

关 键 词：高速铁路 路基 岩溶 电测深法 联合剖面法 

分 类 号：U213.1[交通运输工程—道路与铁道工程] P642[天文地球—工程地质学]