双圆形洞室群开挖过程围岩应力场变化分析

洞室群稳定性是水利水电、铁路公路、国防工事、能源开发与储备工程等领域的研究热点问题。结合新疆某水电站洞室群工程,利用3D-Sigma软件建立了5个洞室群模型(每个模型均含有两个圆形洞室),模拟了洞室开挖过程中围岩应力场变化状况,通过在拱顶、拱底、左右拱脚等区域设立应力监测点,详细分析了前期洞室开挖过程中围岩应力场的变化、后期洞室开挖对前期洞室围岩应力场影响以及随两洞室间距增大应力场的变化规律,得出了洞室群开挖过程中的应力集中分布特征。研究成果对深部洞室群稳定性控制具有一定的参考价值。

Analysis of Rock Stress Field Variation in Two Circular Caverns during the Excavation Process

The stability of caverns is the focus of study on water conservancy and hydropower industry,railways,highways,defense,energy development and reserve,and other fields.Based on a hydroelectric power station hole project in Xinjiang,this paper uses numerical simulation of 3D-Sigma software to establish five cavern models which contain two circular chambers,and simulates the rock stress field change in actual excavation process.Through setting up stress monitoring points such as top arch,bottom arch,left and right arches,the paper analyzes the stress field change in pre-chamber excavation process,the impact of post-excavation of the cavern to pre-stress field and the changing range of stress field with the hole distance increasing,and obtains the feature of stress intensiveness in the actual excavation process.The research results have some reference value for the stability control of the deep caverns.