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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。
The Jinping I Hydropower Station tail water surge chamber is 2 giant cylindrical shafts, and is located in a complex high-stress geological body with two large faults and multiple sets of joint cuttings. It is difficult to excavate and support the spherical crown at the top. Both engineering application and theoretical research show that the mode of excavation and supporting parameters are the key factors affecting the stress distribution and deformation of the dome of tailrace surge tank. Based on the investigation on the f14 fault and lamprophyre vein of the roof arch of 1 # tailrace surge chamber, the site investigation of the influence zone of the fault, the deformation and failure of the surrounding rock of the tailrace surge tank were analyzed by mechanical analysis, in situ monitoring and three-dimensional numerical simulation Mechanism to conduct an in-depth analysis to study the deformation and mechanical characteristics of the surrounding rock during the excavation of tailrace surge chamber. Finally, some useful suggestions for the excavation and support of the tailrace surge chamber are provided, which provide technical support for the dynamic excavation support design of Jinping I Hydropower Station.