Compressive and adhesive strengths of shotcrete deteriorated by hazardous components in the groundwater

摘要

Shotcrete for the support of underground excavations has been widely used in mining engineering and civil engineering. The shotcrete can prevent large deformation of ground causing the tunnel to collapse. The shotcrete failure was largely dependant on the loss of adhesion of shotcrete with rock mass and bending failure of shotcrete, and the adhesion of shotcrete should be maximized to improve the supporting ability of shotcrete. It has been reported that the cement concrete has been deteriorated by chemical materials, such as acid, sulfate, and so on, in the water. Also, the shotcrete may be deteriorated by chemical materials because the components of shotcrete are similar to those of cement concrete. The deterioration of shotcrete may cause the collapse of the tunnel.