The resistivity responses characteristic in the overbreak zone of cover strata

By means of the physical model satisfying simultaneously the similar conditions of mechanical properties and constant current field properties, the dynamic responses between the developing process of the overbreak zone in the mining process and the apparent resistivities were studied in detail by using the direct problem physical simulation of constant current field and in situ exploration. The variation of the relative abnormities of resistivity caused by the overbreak zone was found out by the direct and inverse fitting.