苗尾水电站边坡倾倒变形机理与加固效果分析

倾倒变形边坡是一类较为复杂的岩石边坡,其稳定性分析方法和评价标准尚无设计规范遵循,变形机理与加固处理设计理念与常规滑动模式边坡存在一定的差异,因而倾倒边坡的稳定性分析与治理往往成为工程的技术难题。针对苗尾水电站施工过程中右坝基边坡发生的较大范围倾倒拉裂变形,通过地质结构分析,并结合数值模拟,进行了右坝基边坡倾倒变形机理研究。在此基础上,提出了以预应力锚固为主,加强边坡排水的综合加固措施。数值计算和监测成果表明加固处理后边坡处于稳定状态。苗尾水电站右坝基边坡典型倾倒变形治理的工程实践,可为类似复杂工程边坡提供借鉴。

Slope Toppling Deformation Mechanism and Reinforce Effectiveness Analysis of Miaowei Hydropower Station

Toppling slope is one of the complicated rock slopes.Deformation mechanism of toppling varies due to different geological conditions.To a certain extent,toppling slope is different from general sliding mode slope both in reinforcement idea and stability analysis method,which makes toppling become a difficult engineering issue in projects.Aiming at the wide range of toppling-crack deformation occurred at the right slope in Miaowei hydropower station,the deformation mechanism was studied by geological analysis and numerical simulation.Focusing on prestressed anchor and strengthening slope drainage,comprehensive rescue reinforcement measures were put forward.Both the results of numerical analysis and monitoring show that the treated slope is stable,which indicates the reinforcement measures is feasible and effective.The typical case of processing against complicated toppling slopes in Miaowei can be reference for similar projects.