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基坑隆起稳定性数值分析是深基坑工程研究中的重要方法,尚处于初步探讨阶段,还存在一些重要的科学问题有待深入认识。基于国内外这方面的研究成果并结合笔者在软土基坑三维数值参数分析工作中的经验,对基坑隆起稳定性数值分析中的隆起破坏空间效应、破坏模式、本构模型及参数选择等问题进行了初步探讨,指出隆起稳定分析应重点开展三维和窄长基坑双侧隆起分析;破坏模式辨识中,隆起模式未必与传统方法的破坏模式相同;土体本构模型选择应主要考虑土体加卸荷条件以及屈服与破坏准则;参数分析中,首次指出本构模型参数选择存在可行域问题。
The numerical analysis of foundation pit bumpy stability is an important method in deep foundation pit engineering research. It is still in the preliminary exploration stage. There are still some important scientific issues to be understood in depth. Based on the research results at home and abroad and the author’s experience in three-dimensional numerical analysis of soft soil foundation pit, the space effect, failure mode, constitutive model and parameter selection of the bump failure in numerical analysis of foundation pit stability It is pointed out that the uplift stability analysis should focus on the analysis of the two-sided uplift of 3D and narrow foundation pit. In the identification of failure mode, the uplift mode is not necessarily the same as that of the traditional method. The selection of soil constitutive model should mainly consider soil Body loading and unloading conditions as well as yield and failure criteria. In parametric analysis, it is first pointed out that there is a feasible problem in the constitutive model parameter selection.