【摘要】 锦屏一级水电站尾水调压室为2个巨型圆筒状竖井,且位于2条大断层及多组节理切割的复杂高应力地质体内,球冠状顶部开挖支护困难。工程应用和理论研究均表明:开挖方式和支护参数是影响尾水调压室穹顶应力分布和变形的关键因素。基于对1#尾水调压室顶拱f14断层及煌斑岩脉,断层影响带的现场勘察研究采用力学分析、原位监测和三维数值模拟等手段,对尾水调压室围岩变形破坏机制进行深入分析,研究尾水调压室开挖过程中穹顶围岩变形和力学特征。最后,对尾水调压室的开挖、支护提出若干有益的建议,为锦屏一级水电站的动态开挖支护设计提供技术支持。更多还原

【Abstract】 The surge tank at tailrace of Jinping I hydropower station is composed of two vertical cylindrical wells of large-diameter at the location of high stress and complex geological configurations with two large scale faults and multiple sets of joints. It was difficult to cavern out the domes and setup supporting structures at the top of cylindrical wells. Engineering practice and theoretical research show that the methods of excavation and the parameters of supporting are the key factors influencing the stress distribution and deformation at the crest of the dome of the tailrace surge tank. Lamprophyre veins and fault f14 were found to exist above the dome of tailrace surge tank #1 through in-situ investigations. The deformation and failure mechanisms of surrounding rock of the tailrace surge tank are studied through mechanical analysis,in-situ monitoring and 3D numerical simulation. The deformational and mechanical characteristics of the dome rocks during excavation process were studied. Some advices on the excavation and support for the tailrace surge tank are thus presented as the technical supports for its excavation and design of the support.更多还原