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基坑抗隆起稳定性验算是软土基坑支护设计中的一项重要内容。本文结合基坑工程实例,采用有限元强度折减法对基坑坑底的抗隆起稳定性进行分析。主要分析总结了基坑开挖深度、支护结构入土深度、支护结构刚度、基坑深宽比以及坑底软土层厚度对基坑抗隆起稳定性的影响规律。研究表明:基坑开挖深度、基坑宽度、支护结构入土深度和坑底软土层厚度等参数的变化均对基坑抗隆起稳定性有一定程度的影响,而支护结构刚度参数对抗隆起稳定性影响不明显。通过与规范法计算结果的对比分析,证明了有限元强度折减法在基坑抗隆起稳定性分析中的适用性。
Foundation pit anti-swelling stability check calculation is an important part of the design of soft soil foundation pit support. Combining with the engineering example of foundation pit, this paper analyzes the anti-swelling stability of pit bottom with finite element strength reduction method. This paper mainly analyzes and summarizes the rule of excavation depth, supporting depth, supporting structure stiffness, pit aspect ratio and the thickness of soft soil layer on the anti-raising stability of foundation pit. The results show that the variation of parameters such as excavation depth of foundation pit, width of foundation pit, penetration depth of supporting structure and thickness of soft soil layer at bottom of pit have a certain degree of influence on the anti-swelling stability of foundation pit, while the stiffness parameters of supporting structure Bump stability has no obvious effect. By comparison with the results of the normalized method, the applicability of the finite element strength reduction method in the analysis of anti-swelling stability of foundation pit is proved.