Experimental Study on Seepage Characteristics of Fractured Rock Mass and Its Electrical Response

Abstract

Fissure seepage is the main factor that causes mine water disasters. Physical models of the fractured rock mass with various widths of fracture were designed to perform the seepage test, which demonstrated the seepage characteristics of the fractured rock mass. Furthermore, grouting tests were performed, with the network parallel electrical test conducted simultaneously, during the water and slurry seepage, respectively. The relationship between the seepage velocity and the hydraulic gradient during the seepage process was fitted to a quadratic function, in which the seepage flow resistance of the fractured water was a key factor affecting the seepage flow. The percolation velocity gradually decreased as the width of the percolation fissures increased under the relatively stable seepage pressure difference. The seepage velocity of the percolation medium was quantified by the change of the natural electric field along the path of the seepage. The change extent of the exciting current and the variation of apparent resistivity determined the location of the percolated medium and the filling effect on the space of the seepage channel.