超大型地下洞室群施工开挖程序及围岩稳定分析

结合某水电站超大型地下洞室群施工过程中围岩稳定问题,利用3维非线性有限元以3大洞室(主厂房,主变室,尾调室)开挖顺序不同的3种施工方式,对地下洞室群进行了稳定计算和分析比较,为施工设计和现场施工提供了较为可靠的依据

The Excavation Procedure of Super-Large Underground Chambers and the Surrounding Rock Stability

During the construction of a group of super large chambers, the most critical problem is the stability of the surrounding rock. So it's necessary to analyze the excavation sequence and the stability of the underground chambers. In this paper, three main chambers of an underground hydropower station are excavated according to three different schemes. The stability of the underground chambers constructed in accordance with the three excavation schemes are analyzed and compared by employing three dimensional nonlinear finite method, supplying a reference for the construction design and field construction. In addition, some relevant comments and suggestion are put forward for the revealed problems in the surrounding rock stability.