基于电追踪技术的基坑止水帷幕渗漏探测数值模拟研究  

Numerical Simulation Study on Leakage Detection of Waterproof Curtain in Foundation Pit Based on Electric Tracking Technology

作　　者：徐明江 陈煜烽 刘春林 XU Ming-jiang;CHEN Yu-feng;LIU Chun-lin(Guangzhou Testing Centre of Construction Quality and Safety Co.,Ltd.,Guangzhou 510440;Guangzhou Construction Engineering Co.Ltd.,Guangzhou 510030)

机构地区：[1]广州建设工程质量安全检测中心有限公司,广州510440 [2]广州建筑股份有限公司,广州510030

出　　处：《广州建筑》2022年第6期49-52,共4页GUANGZHOU ARCHITECTURE

基　　金：广州市建筑集团科技计划项目(2022-KJ005、2021-KJ007、2020-KJ007);广州市建筑科学研究院科技进步项目(2022Y-KJ01、2021Y-KJ04)。

摘　　要：基坑开挖时常会发生渗漏水现象,危及基坑及其周边环境安全。因此,基坑开挖前对止水帷幕潜在渗漏点进行精准探测和事先处理就显得尤为重要。止水帷幕渗漏通道的几何尺寸通常较小,所引起的电性空间差异小,现有高密度电法和电磁勘探方法通常难以分辨渗漏位置。本文提出一种基于电追踪技术的基坑止水帷幕渗漏探测方法,利用非结构有限元法实现了基于电追踪技术的渗漏探测三维数值模拟,并对探测装置的关键参数和渗漏通道属性的影响规律进行讨论分析。结果表明:本文提出的基于电追踪技术的基坑止水帷幕渗漏探测方法能够实现对止水帷幕渗漏点位置的有效探测。Leakage often occurs during the foundation pit excavation,endangering the safety of the foundation pit itself and the surrounding environment.Therefore,it is especially important to accurately detect and deal with the potential leakages of waterproof curtain before excavation.In addition,the electrical spatial differences caused by waterproof curtain leakage are so small that the location of leakage is difficult to be distinguished by using the high-density resistivity method and electromagnetic exploration methods.To this end,this paper proposes a leakage detection method of foundation pit waterproof curtain based on electric tracking technology.A three-dimensional numerical simulation of the leakage detection based on the electric tracking technique is realized by using the nonstructural finite element method.At the same time,the key parameters of the detection device and the influence regularity of the leakage properties are discussed and analyzed.The results shows that the leakage detection method of waterproof curtain of foundation pit based on electric tracking technology can achieve the effective detection of waterproof curtain leakage location.

关 键 词：止水帷幕渗漏 电追踪技术 三维数值模拟 电位异常 

分 类 号：TU52.8[建筑科学—建筑技术科学]