立洲水电站调压井不同施工方案三维非线性有限元分析

3-D Nonlinear Finite Element Analysis of Surge Tank of Lizhou Hydropower Station in Different Construction Schemes

就调压井而言,其施工期的围岩稳定、结构受力特性是设计中须深入研究的关键技术问题之一。以立洲水电站调压井工程为研究对象,应用三维非线性有限元法对其不同方案的开挖支护效应、应力变形规律、围岩稳定及衬砌结构内力分布等开展了较为深入系统的研究,揭示该工程调压井不同施工方案井壁围岩、边坡的应力变形、塑性区分布规律及其稳定性,提出了推荐施工方案、建议优化措施等。上述研究成果为该工程优化设计提供了重要的参考依据。

The surrounding rock stability and structural load bearing features of surge tank in construction period are key technical issues in the design.The surge tank of Lizhou hydropower station in different construction schemes is taken as an example to research the excavation supporting effect,stress deformation law,surrounding rock stability,lining structure stress distribution and reinforcement.The research is carried out through 3-D nonlinear finite element method.The stress deformation and plastic zone distribution and stability of the lining surrounding rock,and slope stress in different schemes are revealed.Construction scheme and optimization measures are recommended.The research result provides reference for the optimization design of the project.