深厚软土地区窄基坑抗隆起稳定性分析

Analysis on Anti-heave Stability of Narrow Foundation Pit in Deep Soft Soil Areas

摘要:

窄基坑抗隆起稳定性分析是基坑设计中亟待解决的问题之一，进一步研究窄基坑隆起破坏模式和稳定性验算方法，对工程安全和节约造价具有长远意义。采用Plaxis有限元软件基于强度折减法模拟窄基坑隆起破坏并详细分析计算结果，提出新的窄基坑圆弧滑动破坏模式并推导出相应的抗隆起安全系数计算公式，结合福州深厚软土地区某窄基坑工程实例分析，进一步验证了公式的合理性。

Abstract:

The anti-heave stability analysis of narrow foundation pits is one of the urgent problems to be solved in foundation pit design. Further research on heave failure mode and stability verification methods of narrow foundation pits has the long-term significance for engineering safety and cost savings. Based on the strength reduction method, the Plaxis finite element software is used to simulate the heave failure of narrow foundation pits and to analyze the calculation results in detail. A new arc sliding failure mode for narrow foundation pits is proposed and the corresponding calculation formula for the anti-heave safety factor is derived. Based on the case analysis of a narrow foundation pit project in the deep soft soil area of Fuzhou, the rationality of the formula is further verified.