深基坑桩锚支护结构变形和内力分析方法探讨

利用弹性地基梁法和有限差分法,分别计算桩锚支护体系在深基坑开挖过程中支护结构的变形和内力,并与实测数据对比分析后发现:两种设计分析模型由于选型差异和对实际桩土作用模拟的情况不同,分析结果与实测结果间存在程度不同的差异,其中弹性地基梁法在支护结构水平位移分析中误差较大,在以强度控制为主的设计情况下使用较妥;有限差分法能更真实地反映桩锚支护结构在深基坑开挖过程中土体与支护结构的变形及内力变化,但计算模型复杂。

Analytic Method Discussion on Deformation and Inner Force of the Pile-anchor Structure of Deep Excavation Under Construction

We have calculated the deformation and inner forces of the pile-anchor structure based on the model of beam on elastic and finite difference method respectively.By comparing the calculated results with the measured values,two analytic models show dramatic discrepancy from the real values due to the selection and the simulation of the soil-pile action.The error of the model of beam on elastic is obvious as it is use in analysis of horizontal displacement of the supporting structure,which is thus suitable for assessment of the designs mainly controlled by strength.The finite difference method can reflect the change of the deformation and inner forces of the pile-anchor structure of deep excavation,although its calculation model is complicated.