开挖边坡稳定性分析及变形破坏机理研究

Analysis of the Excavation Slope Stability and Research on the Slope Deformation Failure Mechanism

为研究开挖边坡稳定性及其变形破坏机理,选取典型开挖边坡工程实例,在调研工程区域地质条件的基础上,研究了开挖边坡特征、边坡病害发生情况、边坡破坏类型及破坏机理,获取边坡工程灾害的发生机制及边坡失稳破坏规律。基于赤平极射投影法,对边坡危险优势节理组特征以及优势节理组、边坡面产状进行分析,得到边坡潜在的破坏模式。采用极限平衡理论,对边坡的稳定性及变形破坏机理展开研究,并运用Flac3D有限元法对开挖边坡稳定性计算结果进行验算。研究结果表明:采用理论计算、定性分析、数值计算相结合的手段,能够得到边坡稳定性分析较为满意的结果,从而可以为边坡的支护提供支撑及依据。

To study the excavation slope stability and deformation failure mechanism,the author,taking the typical exca-vation slope as the engineering instance,on the basis of regional geological conditions in the research project,studied the slope excavation characteristics,disease occurrence,types of slope failure and failure mechanism,and obtained the mecha-nism of slope engineering disasters and destruction rule of slope instability.Based on plane polar projection method,dan-gerous joint set characteristics and advantages of the slopes joint set,slope surface occurrence were analyzed.With the limit equilibrium theory,the stability of slope deformation and failure mechanism was studied.Additionally,Flac3D finite ele-ments method is used to check the stability calculation results of the slope.Research results show that,the combination of theoretical calculation,qualitative analysis and numerical calculation can get the relatively satisfactory results of slope sta-bility analysis,which can provide support and basis for the slope support treatment.