【作者】 吴宗皓；

【导师】 王奎华；

【作者基本信息】 浙江大学 ， 建筑与土木工程， 2010， 硕士

【摘要】 复合地基工后沉降已受到工程界越来越多的关注。本文通过理论分析、数值计算和工程实例对比,对采用水泥搅拌桩复合地基的机场的沉降和工后沉降进行了较为详细的分析和研究。首先回顾了复合地基的发展历史,介绍了水泥搅拌桩复合地基的研究和应用现状,并总结了目前常用的几种复合地基的沉降计算方法。在此基础上,着重介绍了ABAQUS有限元软件在复合地基固结分析和沉降计算中的应用。通过对一维固结问题的ABAQUS解和解析解的分析比较,验证了ABAQUS有限元软件的正确性。进而运用ABAQUS有限元软件对机场水泥搅拌桩复合地基的固结过程进行了较完整的数值计算,分析了该类复合地基沉降的发展规律,并通过与规范法计算值、Asaoka法计算值和现场实测数据的比较,讨论了采用ABAQUS有限元软件计算机场水泥搅拌桩复合地基沉降和工后沉降的可行性。本文工作表明,对采用水泥搅拌桩复合地基的机场的工后沉降进行计算和控制是十分重要的。ABAQUS有限元软件为该类复合地基工后沉降的计算,提供了一条有效的途径。更多还原

【Abstract】 The settlement of composite ground after construction has been received more and more atentions.In this thesis,a detailed study is made on the settlement of composite ground with cement-mixed columns after construction of airport through theoretical and numerical as well as case analysis and comparisons.Firstly,the development history of composite ground is reviewed,and the status of study and application of composite foundation with cement-mixed columns introduced.Then available methods for the computation of settlement of composite ground are listed.On this basis,the applications of FEM computer software ABAQUS in consolidation and settlement analyses are illustrated by comparing the FEM resuls with the analytical ones for one dimensional consolidation problems.Further more, the computer software ABAQUS is used to analyze the consolidation process of composite ground with cement-mixed columns under an airport,and the principle of the developments of the settlement in these composite ground is revealed.Finally,the FEM results are compared with the ones obtained from traditional method,Asaoka’s method and field observation,and the feasibility of using ABAQUS to calculate the settlement of composite ground with cement-mixed columns after construction of airport is discussed.It has been shown that it is very important to estimate and control the settlement of composite ground with cement-mixed columns after construction of airport,and FEM computer software ABAQUS has provide an efective way for the computation of the settlement of such composite ground.更多还原