泰安抽水蓄能水电站地下厂房围岩稳定性数值模拟及监测分析

Numerical simulation and monitoring analysis of the stability of the underground power house of the Tai′an Pumped-Storage Power Station

应用快速三维拉格朗日差分法对泰安抽水蓄能水电站地下厂房进行了弹塑性数值模拟,准确的模拟了围岩的动态变化过程,对开挖前后围岩的位移场和应力场以及塑性区进行了比较分析.另外,还对该厂房围岩的变形监测资料进行了研究,得出在开挖和支护过程中围岩的变形特征和支护结构的受力特点;并将现场监测结果和位移计算结果进行比较,结果表明:模拟计算结果和监测结果规律基本一致,采用本计算方法模拟开挖大型地下洞室群具有较强的可行性,对今后的地下大型洞室群的稳定性分析具有参考意义.

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.