极限分析下限法在双层地基承载力中的应用

Lower-bound Method of Limit Analysis Applied in Calculation of Bearing Capacity of Two-layer Foundation

本文根据极限分析下限法原理,结合有限元技术和线性优化方法,编制了求解地基极限承载力的程序,并通过与已有地基承载力计算结果比较,证明了本文程序是合理有效的。利用该方法,研究了存在软弱下卧层的双层地基硬壳层厚度以及内摩擦角对于极限承载力的影响。该计算方法对于双层地基工程具有指导作用。

Based on the principle of lower-bound method of limit analysis,the finite element technique and linear optimum method are combined to work out a program which can be used to solve limit bearing capacity of foundation.The results coming from the above program are compared with the existing calculation results of foundation bearing capacity,which verifies the reasonability and effectiveness of the program.The above method is used to study the influences of the thickness and the internal friction angle of the crust layer on limit bearing capacity subject to the existence of weak underlying stratum in two-layer foundation.This method can serve as a guide for two-layer foundation projects..