地基承载力的新计算方法

A new method of calculating the bearing capacity of strip foundation

根据理论及工程实际经验发现,地基破坏时土体影响范围的大小与传统理论的对数螺旋线相比,更接近于圆弧形滑动面。通过假定一系列圆心在基底的圆弧形滑动面,根据安全稳定系数最小确定出圆心在基底边缘时的圆弧面为地基整体失稳时的最危险滑动面;运用极限平衡方法,通过建立力矩平衡方程求解出了一种新的基于条形基础的地基极限承载力计算公式,并与现有的几种地基承载力计算方法进行了比较分析,验证了作者提出的方法远比经典的理论公式结果合理,并与现行常用查表方法结果最为接近,表明作者提出的新方法具有理论上的合理性,通过工程实例验证了其工程价值。

According to the theoretical and practical experience,the affected areas of destruction soil under the foundation is closer to circular slip surface,further less than the logarithmic spiral of traditional theory.This article assumed that the center of series the arc-shaped sliding surface were in the bottom,then according to the minimum security and stability coefficient,the determined center of a circle at the edge of the base of the foundation is the most dangerous slip surface when the overall instability of the foundation.With limit equilibrium method,the author deduce a new theory formula for calculating the bearing capacity of strip foundation.And it is taken to compare with several existing calculation methods of foundation bearing capacity to evaluate it the legitimacy and applicability of engineering practice.