自稳式深大基坑开挖卸载扰动位移一般规律

Universal rule of excavation and unloading disturbance displacement of autostable deep foundation pit

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。

Based on conventional excavation numerical model, peak displacement distribution caused by deep excavation disturbance and change regulation and mechanical origin with ratio of width to depth, soil degeneration parameters and soil strength parameters are studied. The unified calculation formula of horizontal displacement peak value and vertical displacement peak value of foundation pit with ratio of width to depth is established. At the same time, based on sensitivity analysis, the unified calculation formula of the excavation disturbance displacement is established by considering the soil strength and rigidity characteristics. The results have reference value to the design of the structure parameter and excavation stability.