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板式支护体系下的基坑因具备足够的刚度和强度可能发生圆弧滑动而出现隆起破坏,坑底地基失稳也可能引起地基极限承载力剧降。考虑到参数的变异性,常规的方法得到的基坑抗隆起稳定性系数可能并不安全,为此提出将板式支护体系下基坑的隆起破坏视为两种破坏模式组成的串联系统,利用常用的可靠度分析方法验算点法(FOSM)分别求出单个破坏模式的可靠度指标,结合逐步等效平面法求出系统的可靠度指标,进而求出系统失效概率,并通过算例对基坑的抗隆起稳定性进行评价。结果表明,基坑的抗隆起破坏可能受任一种破坏模式的控制,因此采用系统可靠度方法评价基坑的抗隆起稳定性更接近工程实际。
Due to sufficient rigidity and strength, the foundation pit under the plate support system may have circular arc sliding and may have uplift damage, and the instability of the foundation bottom may also cause the ultimate bearing capacity of the foundation to decrease drastically. Taking into account the variability of the parameters, the stability coefficient of the foundation pit obtained by the conventional method may not be safe. Therefore, the proposed method is to consider the failure of the foundation pit under the slab support system as a series system of two failure modes. The commonly used reliability analysis method check point method (FOSM) is used to calculate the reliability index of a single failure mode. The reliability index of the system is obtained by the step by step equivalent plane method, and then the failure probability of the system is obtained. Pit anti-bump stability was evaluated. The results show that the anti-swelling of the foundation pit may be controlled by any failure mode. Therefore, the system reliability method is more effective in evaluating the anti-swelling stability of the foundation pit.