Study on Comprehensive Testing of Lossless Precision Testing for Leakage of Waterproof Curtain in Foundation Pit

As the rapid development of ultra-deep foundation pit, the effective detection technology for the foundation pit envelope leaks is still an urgent need. Resistivity method is an important way to carry on anti-seepage detection. However, there is no relevant theoretical formula to guide the specific construction for practical application. The main objective of this note is to build a new theoretical model of detection range of the micro-logging method. The numerical simulations of transverse and longitudinal cracks detection have been carried out by the AM and AMN methods, respectively. The calculation formula of micro-logging electric detection's sensitivity has been proposed and the influence of electrode tube distance, the electrode pole distance and crack size have been analyzed. Finally, the results of the practical application in the project illustrate reliability and accuracy of the micro-logging theory, indicating that the equivalent simplification of the testing process is realized.