条形地基极限承载力的数值极限分析方法

Numerical Limit Analysis Method on Ultimate Bearing Capacity of Strip Foundation

数值极限分析方法既有很广的适用性,又有很好的实用性。该文通过有限元荷载增量法和极限应变法计算条形地基的极限承载力,并和传统经验公式的计算结果进行对比分析,验证了数值极限分析方法的可靠性。基于有限元荷载增量法求解地基承载力系数的数值解,可以解决采用经验公式计算可信度不高的问题,并能综合考虑基础宽度和地基土内摩擦角的影响。修正后的地基极限承载力经验公式具有更明确的物理意义,基于数值极限分析方法构建的地基承载力系数取值表格更具实用性和可操作性。

Numerical limit analysis has wide applicability and feasibility. Through the FEM load increment method and limit strain method,this paper testifies the reliability of the numerical limit analysis and compares the calculation result with that of the traditional and empirical expressions. The numerical solution of the bearing capacity coefficient of the foundation with the FEM load increment method can solve the problem of low reliability of the empirical calculation method and comprehensively take the influence of the width and the inner friction angle of the foundation soil into consideration. The corrected empirical formula of the ultimate bearing capacity of the foundation is more physically meaningful. The evaluation table of the bearing capacity coefficient on the basis of numerical limit analysis is more feasible and practicable.