STABILITY ANALYSIS FOR WEDGE ROCKMASS OF UNDERGROUND CAVITIES UNDER DYNAMIC LOAD

According to three fundamental assumptions of wedge rockmass(wedge) failure, a physical model of wedge in underground cavities is established and a limit equilibrium method for wedge stability analysis is proposed. The method can obtain a stability coefficient calculation expression to judge stability state pursuant to the geometrical analysis. It further discusses wedge stability dynamic response under blasting construction load. Case analysis indicates that wedge in gravity is in a stable state, and the wedge stability increases when the wedge is exerted by beginning blasting load. Engineering blasting load is much greater than the weight of wedge. Blasting load can play a leading role in the wedge stability. When blasting stress waves reflect the wedge, its stability decreases markedly. Single sliding failure of wedge occurs along surface ①.