基坑渗漏水土流失区的超高密度电阻率法探测数值模拟及试验研究

Numerical Simulation and Experimental Study on Detection of Soil and Water Loss Area by Ultra-high Density Resistivity Method in Foundation Pit Seepage

基坑开挖时常会发生渗漏涌水现象,危及基坑及其周边环境安全。基坑发生涌水险情时对渗漏与水土流失区域进行快速精准探测和针对性注浆封堵尤为重要。本文针对基坑渗漏与水土流失区域的低阻特性,尝试应用超高密度电阻率法实现基坑渗漏与水土流失区域精准定位。首先利用超高密度正反演软件ZZ-RINV2D得到渗漏与水土流失区域的地电响应规律,其次对发生渗漏险情的基坑进行探测试验。结果表明:超高密度电阻率应用于基坑渗漏与水土流失区域探测具有一定的可行性,反演结果结合地质资料能够快速圈定渗漏与水土流失区域的位置,为注浆封堵提供可靠的技术支持。

The phenomenon of leakage and water gushing often occurs during excavation of foundation pit,which endangers the safety of foundation pit and its surrounding environment.It is very important to detect the leakage and soil erosion area quickly and accurately and to plug the area with grouting when the danger of water gushing occurs in the foundation pit.In view of the low resistance characteristics of the excavation leakage and soil erosion area,this paper tries to apply the ultra-high density resistivity method to achieve the precise location of the excavation leakage and soil erosion area.Firstly,the geoelectric response rules of leakage and soil erosion areas are obtained by using the ultra-high density forward and inversion software ZZ-RINV2D.Secondly,the detection test is carried out on the foundation pit where the leakage danger occurs.The results show that the application of ultra-high density resistivity to the detection of soil and water loss area of foundation pit leakage has a certain feasibility,and the inversion results combined with geological data can quickly define the location of the leakage and soil loss area,and provide reliable technical support for grouting plugging.