摘要
复合地基研究的关键在于各类复合地基中荷载传递机理、附加应力的分布规律及特点。而对这一问题的研究,以有限元为代表的数值模拟方法,可以模拟复合地基的物理几何特性及各种工况,可以展示整个计算域的应力场和位移场,可以避免模型尺寸、形状、荷载、参数等限制,并且可以模拟室内和现场难以达到的试验条件和试验方案,在工程中有着广阔的应用天地。文中结合高速铁路实际工程概况,应用MIDAS/GTS数值模拟软件建立三维有限元模型,进一步对路堤荷载下CFG桩复合地基沉降变形和荷载分担影响因素进行了系统分析,研究了CFG桩复合地基在各个施工阶段对桩帽顶部与桩间土的沉降及受力的影响规律。
The key to study composite foundation is the load transfer mechanism,the additional stress distribution and characteristics.About the researches on this issue,numerical simulation method as the representative of the finite element can simulate the geometric properties of composite foundation and a variety of physical conditions.And it can show the stress field throughout the computational domain and the displacement field,which can avoid model size,shape,load,parameters and other restrictions.Numerical simulation method is also able to simulate laboratory and field test conditions and test programs so that it has a vast world.In this paper,according to the actual survey of high-speed railway project,three-dimensional finite element model is created applying MIDAS/GTS numerical simulation software.Furthermore,systematic analysis of deformation and load distribution factors of CFG pile composite foundation under embankment load is carried out.Settlement and the force of law of the pile cap and soil of CFG pile composite foundation in all construction phase is also studied in details.
出处
《公路》
北大核心
2011年第10期12-17,共6页
Highway
关键词
施工阶段
CFG桩复合地基
沉降
应力
有限元
construction period
CFG pile composite foundation
settlement
stress
finite element
