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传统的基坑抗隆起稳定分析上限法的变形机构在用于饱和黏土基坑时,往往不符合基坑的真实变形。根据软土地区基坑开挖引起的地表沉降曲线,构造了饱和黏土基坑抗隆起稳定性上限分析的变形机构和运动许可速度场,变形机构内部的土体作为连续变形体,且在边界处没有明显的破坏面。提出了一种新的基于上限法的基坑抗隆起稳定性分析方法,该方法采用的变形机构更符合实际的基坑变形,而且可以考虑支护结构入土深度对基坑隆起变形的影响。结合算例与工程实例,并与基于Terzaghi机构和Prandtl机构的上限法、多块体上限法进行对比,验证了本方法的合理性与适用性。
The deformation mechanism of traditional upper limit method for stability analysis of foundation pit is often inconsistent with the actual deformation of foundation pit when used in saturated clay foundation pit. According to the ground settlement curve caused by the excavation of foundation pit in soft soil area, the deformation mechanism and movement permission velocity field of the upper limit stability analysis of saturated clay foundation pit are constructed. The soil body inside the deformation mechanism is regarded as the continuous deformation body, No obvious damage to the surface. A new method based on the upper bound method is proposed to analyze the anti-swelling stability of the foundation pit. The deformation mechanism adopted by the method is more in line with the actual deformation of the foundation pit, and the influence of the supporting depth on the deformation of the foundation pit can be considered. Combining the examples with the engineering examples and comparing with the upper bound method based on the Terzaghi mechanism and the Prandtl mechanism, the multi-block upper bound method is verified, which proves the rationality and applicability of this method.