(1. College of Civil Engineering，Qingdao University of Technology，Qingdao，Shandong 266033，China；2. Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering，Ocean University of China，Qingdao，Shandong 266100，China；3. Qingdao National Laboratory for Maine Science and Technology，Qingdao，Shandong 266061，China；
4. China Railway 14th Construction Bureau Co.，Ltd.，Jinan，Shandong 250014，China)
Abstract：In order to effectively detect the hidden faults of the retaining structures of deep foundation pit and ensure the safety of foundation pit，a theoretical model for the detecting range of the micro-well logging were deduced based on the theory of electrode tube detection. The numerical simulation on the detection of transverse cracks and longitudinal cracks were carried out with methods of AM and AMN. The results show that the perceiving ability of AM to transverse cracks is greater than that of longitudinal cracks，the perceiving ability of AMN to longitudinal cracks is greater than that of transverse cracks. The influence of electrode tube distance，the electrode pole distance and crack size on the sensitivity of micro-logging electric detection were analyzed. The results show that the sensitivity of AM device is mainly related to the electrode pole distance and the width of the cracks to be measured，while the sensitivity of the AMN device is mainly related to the electrode tube distance and the lengths of the cracks to be measured. The general requirement of parameter setting is put forward according to engineering practice. The reliability and accuracy of the micro-well logging theory in the seepage detection of the wall were verified through the physical simulation and practical application. The equivalent simplification of the testing process was realized.
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2017, Vol. 36 
