Parameter sensitivity analysis on tunnel rock's stability of Jinping II hydropower station

The scale of the construction and the buried depth of deep hydropower stations increases. Because of the instable mechanical properties of deep rock mass and complex environment, the stability of tunnel rock in the deep state is an important study object in deep rock mechanics. The rational choice of rock mass parameters around the diversion tunnel, construction methods and the distribution of tunnel center distances will greatly affect the safety of hydropower projects. Using finite element analysis software ANSYS, many numerical models with different parameters and different tunnel center distances have been constructed and parameters for the sensitivity of surrounding rock stability were analyzed. The displacement, stress and plastic zone were analyzed to establish the relationship between the stability of surrounding rock and the parameters.