大型尾水调压室穹顶开挖支护力学与变形特征研究

发布时间：2018-11-11 19:13

【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。
[Abstract]:The tailrace surge chamber of Jinping I Hydropower Station is composed of two giant cylindrical shafts and is located in the complex high stress geological body with two large faults and multiple joints cutting. It is difficult to excavate and support the spherical crown top. The engineering application and theoretical study show that the excavation mode and the supporting parameters are the key factors affecting the stress distribution and deformation of the dome in the tailrace surge chamber. Based on the field investigation of the f14 fault and lamprophyre vein of the top arch of the tailings surge chamber and the fault influence zone, the deformation and failure mechanism of the surrounding rock of the tailrace surge chamber is analyzed by means of mechanical analysis, in-situ monitoring and three-dimensional numerical simulation. The deformation and mechanical characteristics of dome surrounding rock during the excavation of tailrace surge chamber are studied. Finally, some useful suggestions are put forward for the excavation of tailrace surge chamber, which provides technical support for the dynamic excavation and support design of Jinping first class hydropower station.
【作者单位】：浙江工业大学建筑工程学院;北京市勘测设计院有限公司;清华大学水沙科学与水利水电工程国家重点实验室;
【基金】：清华大学水沙科学与水利水电工程国家重点实验室开放基金资助项目(sklhse 2014 D 02) 浙江省科技厅公益项目(2012C21105) 浙江省重点科技创新团队项目(2010R50035)
【分类号】：TV732.5

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