复合桩基础桩-土-承台承载力特性分析研究

为研究复合桩基础桩-土-承台承栽力各自占桩基础总承载力的比值,采用有限元方法,以接触模型模拟混凝土/地基接触面,分端承型和摩擦型桩两种类型,对承台底地基土强度和外荷载大小对桩基础承载力分配的影响进行了分析研究.结果表明:端承型和摩擦型桩的承栽力分配存在较大不同；端承型桩的端阻力随着承台底土强度的增大而增大,侧阻力基本不...

Study on Proportions of Loads on Pile-Soil-Pile Cap of Composite Piled Foundation

In order to study the composite piled foundation’s bearing capacity which is distributed among the pile,soil and pile cap,using the finite element method,and applying the contact model to imitate the interface between concrete and foundation soil,in this paper,the influence of soil’s strength and external load on the proportion of the pile,soil and pile cap’s loads is studied.And this paper discusses this topic on two kinds of pile foundation,that’s end-bearing pile and frictional pile.The result shows that the end-bearing pile and frictional pile’s load proportion are different from each other.The role of the end-bearing pile’s end resistance grows with the soil’s strength,while the side resistance changes little.However,the frictional pile’s end resistance doesn’t change with the soil’s strength,while the side resistance grows.Meanwhile,the result also shows that the pile cap effect grows with the soil’s strength no matter what type of the pile is,and the proportion of the pile cap’s load is not as small as we think before,so it can’t be ignored in any situation.When it comes to the influence of the external load,the computation shows that the end resistance will decline if the external load grows,while the side resistance and pile cap effect’s change law are just right opposite.