Assay of field experiment and forward calculated results of cement-soil cut-off wall’s defect detecting with multi-electrodes resistivity method

Some cement-soil samples measured in laboratory have showed low resistivity character in a short time after they were mixed. On base of this point, many electrodes were set on the top of cement-soil cut-off wall along it’s extend direction to detect the positions of different defects which had been set in the wall in a short time after it had been built. The measured apparent resistivity sections show depth of wall , blanks between poles and cement to soil ratio variation can bring apparent resistivity patterns change and their positions correspondence. Forward Calculated results with 2.5-D finite element method (FEM) also showed the same resisitivity abnormality character with field detecting results and the abnormal resisitivity patterns changing with the type, size and resistivity variation of defects.