某水电站边坡稳定性分析及治理方案研究

Study on Slope Stability Analysis and Management Scheme of a Hydropower Station

【目的】为了消除西藏某存在潜在不稳定岩体的水电站边坡的地质灾害隐患,有必要对其稳定性进行研究并提出治理方案。【方法】以边坡地质勘察和结构面分析结果为基础,选用3个典型剖面构建二维边坡,采用极限平衡法对该边坡在3种不同工况下的稳定性进行计算。【结果】稳定性计算结果表明,3个典型剖面在3种工况下的稳定性系数计算结果均大于1.2,该边坡整体处于稳定阶段;根据稳定性计算结果提出了格构梁+预应力锚索+主动防护网+监测的治理措施。【结论】研究该边坡的稳定性,并针对不稳定岩体提出治理方案,可为类似工程提供参考。

[Purposes]In order to eliminate the geological hazards of a hydropower station slope with po⁃tentially unstable rock mass in Xizang,it is necessary to study its stability and propose a treatment plan.[Methods]Based on the results of geological investigation and structural analysis of the slope,three typi⁃cal profiles were selected to construct a two-dimensional slope,and the stability of the slope under three different working conditions was calculated by the limit equilibrium method.[Findings]The stability cal⁃culation results show that:the stability coefficients of the three typical profiles under the three working conditions are all greater than 1.2,and the slope is in a stable stage;according to the stability calculation results,the management measures of lattice beam+prestressed anchor cable+active protection network+monitoring are proposed.[Conclusions]This study calculates the stability of the slope and puts for⁃ward the management scheme,which can provide reference for similar projects.