中文摘要：

复合地基采用各种桩体作为增强体,使桩与土共同作用而提高天然地基的承载力。论文通过数值模拟的手段分析了桩身弹性模量、褥垫层强度及褥垫层厚度等因素对复合地基工作性状的影响程度,计算结果显示：桩身模量提高后其桩土应力比也随之增大;在一定范围内,随着褥垫层强度的提高,桩土应力比略有增加;褥垫层厚度在一定范围内增加能够迅速减小桩土应力比,相同褥垫层厚度对不同桩体的应力比调节效果存在区别。

英文摘要：

Various kinds of pile are used as reinforcement in composite foundation which make pile and soil work together and consequently can improve the bearing capacity of natural foundation. In this paper, numerical simulation is used to analyze the influence degree of pile body elastic modulus, cushion layer strength and cushion layer thickness on the properties of the composite foundation. The results show that the pile-soil stress ratio increases with the increase of pile modulus~ in a certain range, with cushion layer strength increases, pile-soil stress increases slightly~ the cushion thickness increases can quickly reduce the stress ratio of pile-soil in a certain extent, and there are difference on adjustment effect of pile-soil stress ratio of same cushion layer thickness to different pile.