软弱下卧层上部天然地基基础底面积的简便计算方法

在进行天然地基上浅基础的设计时。必须验算地基承载力。如果存在软弱下卧层时。还必须进行软弱下卧层承载力验算。根据《建筑地基础设计规范》中关于地基承载力计算及软弱下卧层承载力验算的相关规定，文章推导出一种可直接计算出满足设计要求的基础底面积的简便计算方法。

The Reduced Calculation Method of the Foundation Area above Soft Sub-base

Ground bearing capacity should be calculated before the design for the natural shallow foundation.If there is soft sub-base beneath,bearing capacity of the sub-base should be checked.According to the rules in Foundation Design Standard of Building Ground,a reduced calculation method which can directly figure out the demanded foundation area is introduced.