文登地下厂房开挖方案围岩稳定性分析

Stability Analysis of Wendeng Underground Plant According to Excavation Schemes

摘要: 开挖程序和开挖方法的选择对于实现地下厂房快速、经济、安全的施工具有重要影响。论文以文登抽水蓄能电站地下厂房为例，以“平面多工序，立体多层次”的思想拟定了三个开挖方案，建立相应的有限元分析模型，反演了初始地应力，并应用非线性有限元方法仿真分析了不同开挖方案下洞室围岩的变形、应力状态和屈服区分布。结果表明，三个开挖方案围岩整体稳定，局部变形和稳定主要受穿越厂房的2条主要断层影响，在制定开挖实施方案时可根据进度要求和施工条件等优化开挖步序。研究结果为文登地下厂房的施工方案优化提供了依据，也可供类似工程参考。

Abstract: Excavation procedure and selection of excavation method for the realization of rapid, economic and safety construction of underground plant are very important. This paper will take the underground plant of Wendeng pumped storage power station as an example, three excavation schemes are mapped out with the idea of “many processes in plane and 3-D multi-level”. The corresponding finite element model is established, the initial stress is inverted by GA, and the nonlinear finite element simulation is adopted to analyze the deformation, stress state and yield zone distribution of surrounding rock under different excavation schemes. The results showed that the overall sta-bility of surrounding rock for the three excavation schemes is good, the local deformation and sta-bility was mainly affected by the two major faults. The excavation implementation plan should be made and optimized according to the schedule requirements and construction conditions. The achievement of the study provides a basis for the construction scheme optimization of underground plant in Wendeng project, which also can be a reference for similar projects.