地下水对引水式电站隧洞围岩稳定性影响的研究

基于大型通用有限元软件ANSYS对引水式水电站引水隧洞开挖与衬砌过程进行数值模拟。隧洞开挖与衬砌采用ANSYS软件中的生死单元来实现。通过模拟隧洞的开挖与衬砌，改变地下水水位，进而对各水位对应下的引水隧洞洞身段围岩及衬砌稳定进行评价。故在计算结果的基础上．结合工程实际情况和经验．研究地下水水位对隧洞围岩稳定性的影响，并得出几点有益的结论，以期为实际隧洞工程施工及设计提供依据。

The research on the impact of groundwater to surrounding rock stability of diversion hydropower station

Based on the large finite element software ANSYS, numerical simulation has been conducted for the process of diversion tunnel excavation and lining in diversion hydropower station. Tunnel excavation and lining was realized by the birth-death elements in the ANSYS software, through the simulation of tunnel excavation and lining, changing groundwater water level, evaluating the stability of surrounding rock and lining, which water level water corresponding to diversion tunnel. Therefore, on the basis of calculation results, combining with engineering practice and expe- rience, the effect of groundwater level on tunnel surrounding rock stability was researched, and owning some useful conclusions, in order to provide the basis for the actual tunnel engineering con- struction and design.