基于数值计算的楔形体稳定性分析方法研究

楔形体稳定性极限平衡分析法被广泛应用于边坡和隧道等工程的稳定性分析,但该方法未考虑到楔形体滑动面上的应力分布不均匀问题。为此,本文根据楔形体数值计算得到的滑动面上应力结果,利用岩体抗剪强度准则计算节点的安全系数,通过求和平均给出了楔形体稳定性分析的点安全系数法。同理,依据传统刚体极限平衡法,对楔形体滑动面各单元的剪力、抗剪断能力进行求和,获得了抗滑稳定整体安全系数即面安全系数。最后,通过对一滑动楔形体考核算例的稳定性计算,说明了本文提出的楔形体稳定性分析方法的正确合理性。

Analysis Method of Stability of Sliding Wedge Based on Numerical Simulation

The limit equilibrium method for sliding wedge stability analysis is widely used for stability analysis of slope and tunnel engineering, but it does not consider the asymmetric situation of stress distribution on the wedge sliding surface. For the sake of solve this problem, according to the computation result of stress on the sliding surface of wedge,  the safety factor of node was computed by using the anti-shear strength criterion of rock mass, then the point safety factor method for wedge stability analysis was gave through sum and average method. Similarly,  based on the traditional limit equilibrium method for rigid body, by summing up the shear stress and shear-bearing capacity of each unit on the wedge sliding surface, the anti-sliding safety factor,  namely,  surface safety factor method, was obtained. Finally,  the case study of a sliding wedge was performed, which shows that the presented method are accurately and reasonable.