考虑位移效应的支护结构土压力计算

基坑工程中,墙体在墙后土体压力作用下,将产生较大的位移和挠曲变形,引起土压力重分布。在充分考虑支护结构-土相互作用的基础上,建立了土压力与墙体位移的关系曲线,并考虑土拱效应引起的应力重分布,得到了考虑位移的土压力计算方法,并通过工程中实测位移不断修正土压力值,能计算非极限状态下土压力的动态值。

Earth Pressure Calculation in Foundation Pit Engineering Under Consideration of Displacement

In foundation pit engineering,the retaining wall will generate a big displacement and flexural deformation due to earth pressure behind wall,and the earth pressure will redistribute.On the basis of fully considering the interaction of the supporting structure and soil,a curve describing the relationship between earth pressure and wall displacement is set up,and the calculation method for earth pressure when considering the displacement is obtained with consideration of stress redistribution caused by soil arching action.The earth pressure is modified according to the real-surveyed displacement.The dynamic value of earth pressure in non-limit state can be computed by this method.