Abstract: The under-ground power house of Tai′an Pumped-Storage Power Station was elasticplastic numerically simulated using the three-dimensional fast Lagrangian analysis of the Continua method. Then the dynamic process in the wall rock was simulated. The changing law of displacements and stresses of the rock-mass was studied. Many monitoring instruments were installed during construction, and much information was received. Based on the complete observation information of the Tai’an Pumped-Storage Power Station, the deformation data of the wall rock were studied. The conclusion shows that the underground power house is steady in principle. In addition,the displacement between computation and observation of certain points in the rock were compared with each other. The results show that the rules of computation and observation results are approximately consistent with each other. It is feasible that underground power houses can be simulated by this method. It will be a  significant reference to other stability analyses of large underground powerhouses.

Key words: underground engineering, wall-rock deformation, observation, numerical simulation