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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 of composite foundation research lies in the load transfer mechanism and the distribution rules and characteristics of additional stress in various types of composite foundations. However, the research of this problem, the numerical simulation method represented by the finite element method, can simulate the physical geometric characteristics and various working conditions of the composite foundation, and can display the stress field and the displacement field of the entire calculation domain, and can avoid the problem that the model size and the shape , Load, parameters and other constraints, and can simulate indoor and field difficult to reach the test conditions and test programs, in the project has a vast world of applications. Based on the actual project status of high-speed railway, a three-dimensional finite element model was established by using MIDAS / GTS numerical simulation software to further analyze the settlement deformation and load sharing factors of CFG pile composite foundation under embankment load. The effects of CFG pile composite foundation on each Influence of Construction Stage on Settlement and Stress of Soil Between Pile Cap and Piles.