Analytical solution of rock pressure for shallow-buried unsymmetrical-loading tunnels under earthquake loading

Based on the pseudo-static method, an analytical solution of rock pressure for shallow-buried unsymme-trical loading tunnels under earthquake loading was derived by rotating the deflection angles of earthquake force and combining the limit equilibrium condition, with discussion on the influencing factors of rock pressure. It is found that the mechanical indexes of rock soil mass have an obvious influence on the lateral pressure coefficient. Under earthquake loading, the vertical earthquake acceleration coefficient always decreases the total vertical pressure on the vault and lowers the lateral pressure coefficient in most cases. The impact of horizontal earthquake acceleration coefficient on the total vertical pressure on the vault and the lateral pressure coefficient depends on the direction of horizontal earthquake force. The lateral pressure coefficient of the shallow-buried side always decreases with increasing ground inclination, but the lateral pressure coefficient of the deep-buried side increases.