Abstract:

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.
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Key words: caverns, numerical simulation, stress field, stress concentration, hole distance