某抽蓄电站地下厂房洞室群开挖支护过程中围岩稳定性分析

某大型抽水蓄能电站的地下厂房洞室群结构复杂,地质结构特殊,安全问题突出,需评价其在开挖支护过程中围岩的稳定性。为此,采用弹塑性有限元法,建立三维模型,使用自编程序Gehomadrid,根据开挖方案,通过不断调整模型中单元的存在状态,真实、有效地模拟了开挖支护过程,得到了开挖支护过程中围岩位移、应力、塑性区以及支护受力等结果。研究成果可为该工程设计、施工提供指导意见,也可为同类工程提供参考。

Stability Analysis of Surrounding Rock during Excavation and Support Process of Underground Powerhouse for Pumped Storage Power Station

The underground powerhouse caverns of a certain large pumped storage power station has characteristics of complex structure, special geological structure and serious safety problem. So, it is necessary to study the stability of surrounding rock during excavation and support process. Therefore, a three-dimensional model was established based on elastic-plastic FEM. According to the excavation plan, self-written program Gehomadrid was used to effectively simulate the excavation and support process by adjusting the state of elements in the model. Finally, the results of displacement, stress, plastic zone of surrounding rock and force of supporting structure in the process of excavation and support were obtained. This study can provide the guidance for design and construction of the project as well for the construction of similar projects.