地基软弱下卧层验算探讨

Discussion on the calculation method of foundation with weak substratum

通过对规范软弱下卧层计算不同方法的比较,复核1≤E_(s1)/E_(s2)<3时软弱下卧层计算时地基压力扩散角取值。对于高层建筑筏板基础,由于主楼所处的位置不同,筏板基础周边的压力不同导致自重压力值pc不同,利用公式计算软弱下卧层顶面处的附加压力值p_(z)和软弱下卧层顶面处土的自重压力值p_(cz)如何取值规范未明确,通过与附加应力系数法和有限元计算结果进行计算比较,给出设计建议。

The value of the Expansion angle of subgrade pressure in the calculation of the weak substratum at 1≤E_(s1)/E_(s2)<3 is reviewed by comparing different methods for the calculation of the standard weak substratum in this paper.For the raft foundation of high-rise buildings,due to the different locations of the main building and the different pressures around the raft foundation,resulting in different self-weight pressure values pc,how to calculate the additional pressure value p_(z)and the self-weight pressure value p_(cz)of the soil at the top of the weak substratum is not clear,this paper gives design suggestions by calculating and comparing with the additional stress coefficient method and the finite element calculation results.