Study on the stability of mine roadways supported by rock bolts and shotcrete in jointed rock masses

Abstract

In recent years, to ensure sufficient coal output for economic development, a significant number of coal mine roadways have been constructed annually in Vietnam's underground coal mines. The coal mine roadways are constructed through different rock conditions, such as soft rock and rock hard with jointed rock masses. The jointed rock masses affect the stability of the mine roadways. Therefore, designing and constructing support systems to maintain the stability of these roadways is important. This study employs the finite element method to assess the stability of a mine roadway supported by rock bolts and shotcrete, constructed within jointed rock masses. The results of the study presented the displacement values, strength factor and failure of the rock mass around mine roadway, as well as the axial force in rock bolts and shotcrete, and the paper also investigated the influence of the inclination angle of the jointed rock masses and the discontinuity spacings for jointed rock masses on the stability of the mine roadway.