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采用一般化基坑开挖数值模型,系统研究了基坑开挖扰动位移峰值分布的区域性及其随宽深比、土体变形参数、土体强度参数等的变化规律和力学成因。建立了水平位移峰值、竖向位移峰值随基坑宽深比的统一计算公式。在参数敏感性分析系统基础上,建立了考虑土体强度特性、刚度特性等综合条件下基坑开挖扰动位移预测统一计算公式。该研究对基坑围护结构参数设计以及开挖稳定性的预测具有参考意义。
A general numerical model for the excavation of a foundation pit is used to systematically study the regional distribution of peak perturbation displacement of excavation and its variation with depth-width ratio, soil deformation parameters, soil strength parameters, and the causes of mechanics. The uniform formula of peak-to-peak horizontal displacements and width-to-depth ratios of vertical displacements is established. Based on the parameter sensitivity analysis system, a unified formula for predicting disturbances and displacements of the foundation pit excavation under the comprehensive conditions of soil strength and stiffness is established. The research has reference significance for the design of excavation retaining structure parameters and the prediction of excavation stability.