多元复合地基承载力可靠度计算

概括了多元复合地基承载力计算方法,并推导出多元复合地基可靠度研究中的极限承载力状态方程.将免疫算法应用于多元复合地基可靠度计算中,基于可靠度指标的几何含义提出优化目标函数,在求解过程中,免疫算法仅需要目标函数的函数值,使计算更为简便,利用Matlab编制了相应的计算程序.通过算例,采用蒙特卡罗法和免疫算法进行对比计算,结果表明免疫算法在进行多元复合地基承载力的可靠度分析时,收敛速度快并且结果精度高.

Reliability analysis of bearing capacity of multi-pile composite foundation

When two or more techniques of ground treatment are comprehensively applied,the multi-pile composite foundation may be formed.In recently years,multi-pile composite foundation is widely used.The classification and the computation methods of bearing capacity of multi-pile composite ground are generalized,and the ultimate bearing capacity equation is deduced in this paper.The immune algorithm is used in reliability analysis of multi-pile composite foundation.Based on the geometric implication of the reliability index,the objective function is presented to calculate the reliability index.In using immune algorithm,only the objective function value is used and the reliability index can be conveniently obtained.The program of computing reliability index is developed in Matlab.Three practical examples using Monte-Carlo method and immune algorithm show that immune algorithm has the advantages of rapid convergence and high perecision in the reliability analysis of bearing capacity of multipile composite ground.