西南某水电站地下厂房开挖方案优选研究

以西南某水电站地下厂房工程为依托，采用动态规划原理，取围岩的等效应变值作为动态规划中的收益函数，对地下洞室群的开挖方案优选进行了研究，运用三维非线性数值计算方法模拟地下洞室群在不同开挖方案下的分步开挖过程，随着搜索优化过程的逐步进行，得出了全局最优解，即洞室群顺序施工的最优开挖方案。研究结果表明:采用动态规划原理得出的最优顺序施工开挖方案是最优方案。

Study on Optimization of Excavation Scheme for Underground Powerhouse of a Hydropower Station in the Southwest

Taking the underground powerhouse of a hydropower station in the southwest as an example, the paper, by use of dynamic programming principle and taking the equivalent strain value of surrounding rock as the payoff function in the dynamic programming, studied the excavation scheme for the underground cavern group in such manner that, the excavation by steps of each scheme was simulated by 3D nonlinear numerical calculation and, as the searching optimization goes on, the global optimal solution, i.e. the optimal excavation scheme for the step construction of the cavern group, was found out. The study result shows that the optimal excavation scheme for step construction obtained by dynamic programming principle is the optimal scheme.