基于"m"法的深基坑支护结构三维分析方法

结合工程实例,提出了一种可以考虑土体、支撑系统、挡土墙三者共同作用的基坑支护结构三维简化分析方法.基于“m“法的基本计算理论,将地基土体考虑成坑内的土弹簧单元和坑外的水土压力,并建立支护结构和土弹簧的三维有限元模型来分析支护结构的内力与变形.应用该方法分析了上海铁路南站北广场深基坑工程的支护结构,计算结果与实测值基本吻合,并且可以从整体上把握结构的受力特性.

3 - D Analysis Method of Retaining Structure of Deep Excavation Based on "M" Method

Combine with a practical project,this paper puts forwad a three-dimensional simplified analysis method which takes account of the interaction between soil, surpporting structure and retaining wall to analyse the retaining structure of deep excavation.Based on the fundamental computational theory of "m" method, the spring element is assumed to simulate the soil inside the excavation, soil and water pressure represents the action of soil outside the excavation to build a 3-D FEM model to analyse the internal force and deformation of retaining structure. This method is applied to analyse the surpporting structure of deep excavation of north square of Shanghai South Railway Station,the results of calculation and the value of measurement are in good agreement, and the whole loading characteristics of structure could be learnt.