Abstract:Based on the basic idea of Sarma method,a sliding block computational model of stability analysis for an anchored rockmass slope is established after taking into consideration the action of earthquake and influence of underground jointed water as well as the supporting effect of rock-bolts. This model has been applied to stability analysis of a large anchored rockmass slope project of Zipingpu Hydropower Station. Computed results show that the safety factor of slope will decrease when the underground jointed water level and the intensity of earthquake increase;in addition,the safety factor of slope will increase after the slope is reinforced. So,it is very important to attach much weight to the influence of underground jointed water and earthquake on slope stability and to take the rock-bolt supporting for slope into account.