为了确定柱下矩形扩展基础的底面积,必须进行地基承载力的验算;教学时一般采用试算确定基础的底面积,试算的次数依经验而定;对于ek≤b/6的情况,很多文章提出了直接求解一元三次方程的手算方法.本文提出一种不需反复试算的直接精确解法,不论偏心距的大小均可直接求得精确解,并以MATLAB为平台编制了程序便于学生和设计人员使用.%To determine the bottom area of the rectangle expand foundation of columns, the carrying capacity of the ground must be verifyed by caculation. Trial-calculation is usually adopted to determine the foundation bottom area in teaching and the times of the trial-calculation depends on experiences. At the situation of ek ^ 6/6 , a lot of papers provide a hand method to solve cubic equation directly. A direct accurate solution without many trial-calculation is put forward to solve this problerm, no matter the degree of eccentricity of columns. And it is compiled to routine for students and designers with MATLAB.
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