地基承载力的数值分析方法

Numerical Analysis of Foundation Bearing Capacity

介绍了边坡稳定的塑性力学上限解在计算地基承载力方面的推广。简要回顾了由Ｄｏｎａｌｄ和Ｃｈｅｎ提出的能量法的基本原理，说明该法可以得出与闭合解一样精确的解答，使用此数值方法来复核地基容重不为零时承载力计算的各种经验方法，发现这些经验方法在大多数情况下均低估了地基的承载力。计算基础有埋深和荷载偏心的经验公式也低估了地基承载力约５％～１０％。

This paper discusses the extensions of the energy method of slope stability to bearing capacity analysis.The basic principles developed by Donald and Chen (1995) have been reviewed,which showed that the new method can give answers as accurate as closed form solutions.The results given by this numerical approach were compared with those obtained by the conventional methods.It has been found that the bearing capacities calculated by empirical methods with non zero foundation soil gravity in most cases have been underestimated.The traditional empirical methods for embedded footings and eccentrical loadings also underestimate the ultimate load by 5%-10%,compared with those given by the numerical method.