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中文摘要：
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.
英文摘要：
The underground power planes were well developed in the rock interlayer. Because of its big span space house of Xiangjiaba hydropower project situated in bedded sandstone rock, bed mass, and the surrounding rock mass stability was mainly controlled by soft （33.4 m） and high side wall （85.5 m）, the surrounding rock mass＇ stability is a big problem. Discrete element method （DEM） was used in evaluating the laminated excavation of the underground cavern group. Firstly, the real excavation procedure of the I st layer was simulated, compared with monitoring data, indicated that the parameters used in computing is reasonable; secondly, the following excavated layers was calculated according to the excavation scheme; finally, the computing and monitoring results were tried to feedback and direct design and construction.
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