周宁抽水蓄能电站下水库右岸边坡稳定性分析

Stability Analysis of the Right Bank Slope of the Lower Reservoir in Zhouning Pumped Storage Power Station

针对周宁抽水蓄能电站下水库右岸岩质高边坡开挖施工,采用三维离散元数值分析方法,深入开展施工期边坡开挖变形响应特征及稳定性分析评价。分析结果表明:边坡开挖引起的坡体变形量值很小,以卸荷回弹变形为主,典型部位的开挖变形量值总体在10 mm以内;开挖后边坡不存在整体稳定问题,边坡潜在危险区域主要是开口线附近的强卸荷岩体,局部存在块体失稳风险,是施工中需要重点关注的问题,可适当控制爆破药量、加强支护。

Three-dimensional discrete element method is used to analyze the deformation response characteristics and the stability of the right bank rock slope of the lower reservoir in Zhouning Pumped Storage Power Station during the construction period.The results show that the slope deformation induced by the excavation is mainly the unloading rebound deformation,and the deformation is very small as the total deformations in typical locations are all within 10 mm.The overall stability of the slope after excavation is of no problem.While,local instability risks are observed in the strongly unloading rock mass near the opening line,which should be the key issue of the excavation construction.In these areas,control of the blasting charge and appropriate support measures should be taken.