含陡倾软弱破碎带节理岩质高边坡稳定性分析

Stability Analysis of High Jointed Rock Slope with Steep Week Fracture Zone

岩质边坡破坏模式及稳定特征主要由边坡发育的控制性软弱结构面决定,以福建某抽水蓄能电站右岸含陡倾软弱破碎带边坡为研究对象,在地质分析基础上,综合运用离散单元强度折减法,对边坡破坏模式及稳定性进行分析。研究结果表明:边坡主要表现为陡倾软弱破碎带和顺层缓倾优势结构面共同控制的滑移变形破坏模式,自然边坡整体稳定性较好,工程开挖会导致边坡稳定性降低,岩体朝向河谷方向的变形量值较大,安全系数不满足规范要求;对边坡采取以预应力锚索加固为主的治理措施后,边坡变形得到了有效控制,稳定性满足要求。

The failure mode and stability characteristics of the rock slope are mainly determined by the dominant weak structural plane.Taking the slope with steep week fracture zone at right bank for a pumped storage power station in Fujian for example,this paper analyzes the failure mode and stability of the slope based on the geological analysis,and combined with discrete unit strength reduction method.The research results show that:the failure mode of the slope is controlled by the steep weak fracture zone and the bedding dominant structural plane with low dip angle.The stability of the natural slope is good,and the slope stability will be decreased by engineering excavation.The deformation of the rock mass towards the river valley is large,and the safety factor does not meet the requirements of the standard.After reinforcement by prestressed anchor cable,the deformation of the slope is effectively controlled,and the stability of slope meets the requirements.