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利用大岗山水电站的地质勘探资料建立不同贯穿节理组合下地下洞室群的DDA模型,分析了洞室群开挖的破坏模式,并简单阐述其破坏机制。基于Monte-Carlo方法模拟节理的随机分布,结合大岗山水电站的开挖设计方案,对地下洞室群在分步开挖过程中的位移及应力演化进行研究。研究表明:洞室群开挖完成后,洞周块体的位移均指向洞内,尾调室上下游与主厂房上游的变形较大;洞周块体的大主应力均平行于洞室边界线,尾调室的应力释放比较明显,其边墙块体发生了滑移;洞室群在开挖过程中互相影响,其中主变室受主厂房和尾调室的影响比较明显。研究结果指出了洞室群开挖过程中需要关注和加固的具体部位,为工程支护措施的优化提供了依据。
Based on the geological exploration data of Dagangshan Hydropower Station, the DDA model of underground caverns under different combinations of joints is established. The failure mode of excavation of cavern group is analyzed and the failure mechanism is briefly described. Based on the Monte-Carlo method to simulate the random distribution of joints and the excavation design of Dagangshan Hydropower Station, the displacement and stress evolution of underground caverns in the step-by-step excavation are studied. The results show that after the excavation of the cavern group, the displacements of the block around the hole all point to the inside of the cave, and the deformation of upstream and downstream of the tail transfer chamber and the upper reaches of the main plant is larger. The main stress of the block is parallel to the boundary of the cavern The stress of the line and tail transfer chamber is more obvious, and the slide of the side wall block occurs. The cavern group affects each other in the excavation process, of which the influence of the main workshop and tail transfer room of the main change room is obvious. The research results point out the specific parts that need attention and reinforcement in the excavation of cavern group, which provides the basis for the optimization of engineering support measures.