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向家坝水电站地下厂房位于层状砂岩中,岩体层理面发育,稳定性受多条软弱夹层控制,且洞室跨度大(33.4m),边墙高(85.5m),因此,在洞室的开挖过程中围岩的稳定性问题显得尤为突出.采用三维离散元软件对地下洞室群的分层开挖进行了模拟计算.首先仿真模拟了地下厂房第一层实际开挖顺序(先中导洞,后两侧扩挖),并对比相应的监测资料,结果吻合较好;然后根据施工方案对以下各层的洞室分层开挖过程进行了模拟计算,将其结果与前人计算结果进行对比;最后,尝试将数值计算结果结合监测结果来反馈分析指导设计和施工.图7,表4,参14.
The underground powerhouse of Xiangjiaba Hydropower Station is located in bedded sandstone. The bedding plane of rock mass develops. Its stability is controlled by multiple weak intercalations. The span of the tunnel is large (33.4m) and the side wall is high (85.5m). Therefore, The stability of surrounding rock is very prominent in the excavation process of the chamber.Discrete element software is used to simulate the stratified excavation of the underground caverns.First, the simulation of the actual excavation sequence The first pilot hole, the latter two sides of the expansion), and compare the corresponding monitoring data, the results are in good agreement; and then according to the construction program of the following layers of tunnel excavation process simulation, the results with the former Finally, try to combine the numerical results with the monitoring results to guide the design and construction of the feedback analysis.