基于差异沉降的变刚度复合地基方案研究

差异沉降是群桩复合地基的一个不容忽视的问题.通过国内最新研制的大型试验台--中国矿业大学城市地下工程相似模拟试验系统,完成了2组模型试验.试验表明:在竖向荷载作用下等桩长群桩复合地基存在着较大的差异沉降.在模型试验和数值模拟的基础上研究了群桩复合地基差异沉降的形成原因,主要包括不同桩位、荷载和下卧层.对采用改变桩长、桩径、桩体模量等方法实现变刚度复合地基的方案进行分析和讨论,结果表明通过改变桩长的方法是实现变刚度的最佳选择.图7,表9,参10.

Study on Project Plan of Variation Rigidity Composite Foundation on the Basis of Differential Settlement

Differential settlement is an important problem in composite foundation of pile group.Two model experiments were conducted with analog simulation experiment system of urban underground engineering in China University of Mining & technology,Beijing campus.The experiment results reveal that differential settlement occurs in the equal length composite foundation under vertical load.The reason of differential settlement is dealt with by model test and numerical simulation results in this paper.It includes different position of pile,different load and different underlayer.In the meantime,project plans of changing length,diameter and modulus of pile of variation rigidity composite foundation are analyzed and discussed.The results show that the method of changing pile length is the most excellent scheme to realize variation rigidity.7figs.,9tabs.,10refs.