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两河口水电站地下厂房地质条件复杂,属于高地应力区,加之受进、出水口布置的限制,其洞轴线选择是一个难点。笔者采用三维非线性有限元方法,对两河口地下厂房N3°E和N7°W两个轴线方案展开平行分析。模拟加固措施和实际开挖过程,对两个方案的地下厂房洞室群围岩应力应变特征和稳定性进行分析评价。分析表明:与N7°W轴线方案相比,N3°E轴线方案较好的规避了地应力释放,可以显著限制变形和塑性区发展,建议采用N3°E方案。
The geological conditions of the underground powerhouse of Lianghekou Hydropower Station are complex and belong to the high stress area. In addition, due to the restriction of the layout of the inlet and the outlet, the selection of the hole axis is a difficult task. The author uses the three-dimensional nonlinear finite element method to analyze the two axial schemes of N3 ° E and N7 ° W in the underground estuary of Lianghekou. Simulating reinforcement measures and actual excavation process, the stress and strain characteristics and stability of surrounding rock mass of underground powerhouse with two schemes are analyzed and evaluated. The analysis shows that compared with the N7 ° W axis scheme, the N3 ° E axis scheme avoids the release of in-situ stress and can significantly limit the deformation and plastic zone development. The N3 ° E scheme is suggested.