锦屏一级水电站左岸坝肩边坡岩体稳定性分析  

An Analysis of Stability of the Abutment Slope at the Left Bank of Jinping-Ⅰ Hydropower Station

作　　者：胡杨[1,2] 林太清[1] 徐海亮[1] 荣冠[1,2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072 [2]水工岩石力学教育部重点实验室(武汉大学),武汉430072

出　　处：《中国农村水利水电》2015年第1期151-157,共7页China Rural Water and Hydropower

基　　金：国家"973"项目资助(2011CB013501,2010CB732005);新世纪优秀人才计划项目资助(NCET-11-0406)

摘　　要：据工程地质调查分析,锦屏一级水电站左岸坝肩边坡岩体的整体稳定性主要由深部裂缝SL44-1、断层f42-9、煌斑岩脉X切割组合的变形体控制。采用三维离散元程序(3DEC)建立了锦屏一级左岸边坡局部三维和真实三维模型,同时考虑了预应力锚索的加固效应,对左岸坝肩变形体施工期的稳定性进行了分析。结果表明,在开挖至高程1 780m之前,坝肩岩体的变形随着开挖逐渐增大;开挖至高程1 780m时,断层f42-9与深部裂缝SL44-1的交线被揭露,阻滑岩体完全被挖除,横河向位移较上一开挖步显著增大。为验证数值模型的合理性,将数值模拟结果与监测资料进行了对比分析,测点横河向位移的计算值与监测值相近,边坡开挖支护后,各测点的位移逐渐收敛,安全状态符合要求。As the engineering geological investigation of Jinping？Ⅰ Hydropower Station points out,the stability of the abutment slope at the left bank is mainly controlled by the deformable body which is cut by the interior fracture SL44-1,the fault f42-9and the Lamprophyre X.The local 3-D model and the overall 3-D model of the left bank have been built by using the three-dimensional discrete code（3DEC）.Research has been conducted on the stability of the deformable body on the abutment slope during the construction period with considering the reinforcement effect of the pre-stressed anchor cable.The result shows that,the deformation of the abutment rock increases along with the excavation before the slope is excavated to the elevation of 1 780 m.After the excavation to the elevation of 1 780 m,the intersection of the fault f42-9and the interior fracture SL44-1has been revealed and the anti-skid rock has been completely excavated.As a result,the lateral displacement increases significantly compared to the previous excavation step.In order to estimate the numerical model,the numerical simulation result has been compared with the deformation monitoring data of the left abutment slope.The lateral displacement from numerical simulation agrees well with the monitoring data.The displacement of monitoring point shows the trend of convergence and stability of the left slope meets the engineering demands after slope reinforcement.

关 键 词：锦屏一级水电站 边坡稳定性 离散元 

分 类 号：P642[天文地球—工程地质学]