云南苗尾水电站倾倒变形体边坡稳定性分析

Stability analysis of toppling deformation slope in reservoir area of Miaowei Hydropower Station in Yunnan

倾倒变形破坏是高山峡谷地区反倾薄层状斜坡的典型失稳形式之一。为了分析云南苗尾水电站库区倾倒变形体边坡(QD8)稳定性,对其岩体结构进行调查,并分析了两种破坏形式。采用极限平衡法,计算倾倒变形体边坡在天然、地震、蓄水和暴雨4种工况下的稳定性。结果表明:边坡最小安全系数为1.18,整体稳定性较好;运用离散元法,得到边坡的应力和位移分布,最大位移为0.14 m,存在局部坍塌现象,因此倾倒变形体边坡(QD8)稳定性较好。研究成果可为倾倒变形体边坡稳定性分析提供借鉴。

Toppling deformation and failure is one of the typical instability forms of anti dip thin-layer slope in high mountain and gorge area.In order to analyze the stability of toppling deformation slope QD8 in the reservoir area of Miaowei hydropower station,the rock mass structure was investigated and two failure modes were analyzed.The limit equilibrium method is used to calculate the stability of the slope under natural,earthquake,water storage and rainstorm conditions.The minimum safety factor of the slope is 1.18,and the overall stability is good.By using the discrete element method,the distribution of stress and displacement of the slope is obtained.The maximum displacement is 0.14 m,and there exist local collapse.Therefore,the stability of QD8 is better.The research results of this paper can provide reference for the slope stability analysis of toppling deformation body.