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采用极限平衡理论对基坑坑底稳定性进行分析的方法是根据“确定性”的土体性质、滑动方式计算其抗隆起稳定系数,将运动单元法理论应用于极限平衡理论,并考虑强度折减原理,建立了适应不同类型滑裂面形式的坑底稳定性分析的“确定性”模型,在此基础上,考虑到坑底土力学性能的随机性及其强度参数不能满足约束条件的随机性,建立了机会约束的可靠性分析方法。针对圆弧滑动面和普-瑞法滑裂面进行计算比较,分析了不同滑动面圆心位置、坑底荷载、支撑荷载对支护结构插入比的影响,以及随机约束函数的置信水平对插入比的控制作用。以一工程实例实现了上述分析思想与方法。
The limit equilibrium theory is used to analyze the bottom stability of foundation pit. The method is based on the “deterministic ” soil properties, sliding mode to calculate the anti-swelling stability coefficient, the theory of moving element method is applied to the limit equilibrium theory, and consider Based on the principle of “strength reduction”, the “deterministic” model of pit bottom stability is established to adapt to different types of slip planes. Based on this, considering the stochastic nature of the mechanical properties of pit bottom and its strength parameters can not satisfy the constraints The randomness of the conditions, established a reliability analysis of opportunity constraints. The influence of the position of center of circle, pit bottom load and supporting load on the insertion ratio of supporting structures is analyzed and compared with that of circular slip surface and Pu-Rui Ru sliding surface, and the influence of the confidence level of stochastic constraint function on insertion ratio The role of control. The above analysis ideas and methods are realized by an engineering example.