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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。
The stability analysis of the wedge stability analysis method is widely used in stability analysis of slope and tunnel engineering. However, this method does not consider the uneven distribution of stress on the wedge sliding surface. Therefore, based on the results of stress on the sliding surface calculated by wedge numerical calculation, the safety factor of the joint is calculated by using the shear strength criterion of rock mass, and the point safety factor method of wedge stability analysis is given by means of summation and averaging. Similarly, according to the traditional rigid body limit equilibrium method, the shear and anti-shear capacity of the sliding surface of the wedge body are summed to obtain the overall safety factor of the anti-sliding stability, that is, the surface safety factor. Finally, the stability of the calculation example of a sliding wedge is illustrated, which shows the correctness of the method proposed in this paper.