杨房沟水电站断层对左岸坝肩稳定性影响及对策  

Study on the Influence of Fault f37 on the Stability of Left Bank Abutment of Yangfanggou Hydropower Station and its Countermeasures

作　　者：闫兴田 段伟锋 么伦强 YAN Xingtian;DUAN Weifeng;YAO Lunqiang(PowerChina Huadong Engineering Corporation Limited, Hangzhou 311122, China)

机构地区：[1]中国电建集团华东勘测设计研究院有限公司,杭州311122

出　　处：《西北水电》2021年第6期44-48,共5页Northwest Hydropower

摘　　要：针对杨房沟水电站左岸坝肩边坡开挖施工情况,基于断层f_(37)性状特征、可能形成的组合块体、边坡监测数据,采用定量计算方法,对施工期边坡稳定性进行分析评价。三维离散元计算表明:块体1、块体2及二者的组合块体,破坏模式均为以断层f_(37)为底滑面的滑移破坏模式。刚体极限平衡计算表明:缆机基础混凝土浇筑前和浇筑后阶段,块体1在暴雨工况下不满足安全要求,应加强支护,块体2在各工况下满足要求;计算分析过程及结果对类似高边坡工程的开挖、支护设计有一定参考价值。Aiming at the excavation and construction of the slope at the left abutment of Yangfanggou hydropower station,the slope stability during the construction period is analyzed and evaluated by quantitative calculation method based on the characteristics of fault f_(37),possible combined block and slope monitoring data.Three-dimensional discrete element calculation shows that the failure modes of block 1,block 2,and their combined block are all slip failure modes with fault f_(37) as the bottom slip surface.The calculation of rigid body limit balance shows that before and after casting of cabling foundation concrete,block 1 does not meet the safety requirements under the working condition of heavy rain and the support should be strengthened,while block 2 meets the requirements under all working conditions.The calculation results can be used as reference for engineering excavation and support design of similar high slopes.

关 键 词：稳定性 开挖变形 左岸坝肩边坡 杨房沟水电站 

分 类 号：P642.22[天文地球—工程地质学]