工程物探技术在地下输水管道病害检测方面的探讨

Exploration of engineering geophysical techniques in the detection of underground water pipeline diseases

在南水北调中线北京段配套工程环线工程地下输水管道病害隐患检测过程中,管道附近土体的运行维护工作急需更全面、准确的日常基础资料,以及更好的输水管道病害检测的解决方案,探讨工程物探技术在大口径混凝土地下输水管道病害检测方面的应用。选用高密度电法和微动法2种物探法,检测输水隧洞附近土体隐患情况,结合前期探测数据和地质资料,以及后期数据反演,综合分析土层结构富含水隐患情况,检测出富含水区域。工程物探技术可为沉降风险区域范围划定提供参考,能为地下隧洞无损检测提供新的思路。

The operation and maintenance of soil near water conveyance pipelines urgently need more comprehensive and accurate daily basic data,as well as better solutions for detecting diseases in water conveyance pipelines during the detection process of hidden dangers in the underground water conduit diseases of the supporting project of Middle Route of South-to-North Water Diversion Project in Beijing.This paper discusses the application of engineering geophysical techniques in the detection of diseases in large-diameter concrete underground water conveyance pipelines.Two geophysical methods,high-density resistivity and seismic micro-tremor survey,were selected to detect hidden dangers in the soil near the water conveyance tunnel.Combining early detection data and geological information,as well as subsequent data inversion,a comprehensive analysis of the structures of soil layers containing hidden water hazards was performed,identifying areas rich in water.Engineering geophysical techniques can provide references for demarcating the range of settlement risk areas and offer new insights for non-destructive testing of underground tunnels.