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基于固定机构的上限法在分析基坑的抗隆起稳定性时,往往会得到偏大的不合理结果。根据上限定理,构造了黏土基坑抗隆起稳定性分析的可变组合机构,可变组合机构通过几何参数的优化得到最优的上限解及相应的破坏机构,并且考虑了强度非均质与各向异性的影响。算例分析表明,所提方法接近于多块体上限法和弹塑性有限元法的结果,并且和传统的固定机构相比具有较大的优越性。
Based on the upper bound method of fixed mechanism, when analyzing the anti-swelling stability of foundation pit, it tends to get unreasonable result. According to the upper bound theorem, a variable combination mechanism for the analysis of anti-swelling stability of clay-based pit is constructed. The variable upper limit solution and the corresponding failure mechanism are obtained by optimizing the geometric parameters of the variable combination mechanism. Impact on the opposite sex. The example analysis shows that the proposed method is close to the result of multi-block upper bound method and elasto-plastic finite element method, and has more advantages than the traditional fixed mechanism.