基于赤平投影方法的周宁抽蓄电站边坡块体破坏模式识别

Recognition of Failure Mode of Slope Block Failure Mode in Zhouning Pumped Storage Station Based on Stereographic Projection Method

岩质边坡的变形和破坏主要受岩体中发育的结构面控制。采用赤平投影法开展岩质边坡破坏模式分析,可以方便地确定结构面之间的组合关系,实现对典型块体破坏风险模式的识别。以周宁抽蓄电站下库坝址区边坡地质与工程条件为背景,开展基于赤平投影法的边坡随机块体破坏风险模式预测分析。结果表明,边坡具有形成块体破坏的结构面条件,且平面滑移和楔形体失稳是施工期可能面临的主要破坏模式;赤平投影法对边坡破坏模式预测的合理性和适用性通过施工期岩体现实破坏表现得到实践验证。

Deformation and failure of rock slope are mainly controlled by structural planes developed in rock mass.The stereographic projection method is used to analyze the failure modes of rock slope,which can easily determine the combination relationship between structural planes and identify the failure risk mode of typical block.Based on the geological and engineering conditions of the slope at the lower reservoir site of Zhouning Pumped Storage Station,this paper predicts and analyzes the failure mode of random block of the slope is predicted and analyzed by the stereographic projection method.The results show that the slope has the structural plane condition for block failure,and the plane slip and wedge instability are the main failure modes that may occur during the construction period.The rationality and feasibility of the stereographic projection method for predicting the failure mode of the slope are verified by the on-site failure performance of the rock mass during the construction period.