某工程陡倾角顺层边坡破坏机制及稳定性分析

Failure Mechanism and Stability Analysis of a Steep Slope of a Project

以长江沿岸某工程边坡为例,在野外调查的基础上,利用板梁弯曲理论、力学模型分析方法对陡倾顺层边坡的变形破坏型式、破坏机制进行分析论证,并对该边坡的溃屈破坏临界坡长和稳定性进行计算分析,认为该边坡目前处于非稳定的蠕动变形阶段,边坡破坏以溃屈、滑塌破坏为主。其变形破坏的程度、溃屈破坏的临界坡长与边坡岩层厚度、滑移面的粘聚力及内摩擦角、边坡坡角、岩体弹性模量以及抗弯刚度相关。针对边坡现状,提出降低坡高、锚固处理的综合工程防护措施建议。

Taking an engineering slope along the Yangtze River as an example,based on the field investigation,the deformation and failure modes and failure mechanisms of steeply inclined slopes are analyzed by using plate beam bending theory and mechanical model analysis method.It is found that the target slope is currently in the stage of unstable creep deformation and its main failurecause refers to collapsing and slumping.It can be observed that the slope deformation and the critical slope length of collapsing destruction is closely related to several properties:rock thickness,cohesion and friction angle along the slipsurface,slope angle,the elastic modulus and flexural rigidity of rock.Some measures of slope stability problems are given for current situation of the slope,such as reducing slope height and anchoring.