【作者】 王茂丽；

【导师】 胡春林；

【作者基本信息】 武汉理工大学 ， 岩土工程， 2005， 硕士

【摘要】 软土地基在外荷载作用下,其沉降一般比较大。在软土地基上修建构造物时,其沉降变形问题是关键性的土工技术问题。对于软土地基固结沉降是否符合实际情况要取决于理论是否完善和合理。本文在现有研究的基础上,考虑土体的非线性特征,对软土地基非线性固结沉降进行研究。本文主要研究工作如下: (1) 论述了软土地基固结及沉降的研究现状,特别是论述了饱和土一维非线性固结理论的研究现状及发展状况。 (2) 对饱和软土地基一维线性固结沉降进行了分析,论述了土固结的基本概念和饱和土的太沙基固结理论。探讨了软土地基工后沉降的计算方法。在Matlab操作平台上编制了计算程序,并结合工程实例,对桩体复合地基的固结沉降进行了分析计算,通过不同的土工参数变化探讨了软土地基固结沉降的规律。 (3) 分析和建立了饱和软土地基单向渗透固结的非线性普遍方程,建立了考虑应力历史的一维非线性固结基本方程。 (4) 借助Matlab软件,结合工程实例,对饱和软土地基一维非线性固结沉降进行了计算与分析。分别考虑了加荷、土层厚度等随时间变化时的一维固结的计算,以及地基为成层土时的一维固结的计算,并对考虑应力历史的一维固结方程进行了求解。得到了一些对工程实际有意义的结论。更多还原

【Abstract】 Under the act of applied loads, the settlement of soft foundation, generally, is quite great. Therefore, the settlement and deformation are key problems of geotechnic techniques when a building is laid on the soft one. Whether the consolidation and settlement of soft clay foundation meets the practical situation or not, it depends on whether the theories are perfect and appropriate. In the thesis, the nonlinear character of soil basing on the existing researches is considered, and the nonlinear consolidation and settlement on the soft clay foundation is studied. The main researches of the thesis are as follows:(1) Discussing of the current study of the consolidation and settlement onthe soft clay foundation, and specially discussing the present state of one- dimensional nonlinear consolidation theory and its development.(2) Analyzing the one-linear consolidation and settlement on the saturatedsoft clay foundation, and introducing the basic conception of the saturated soil and Terzaghi consolidation theory of the saturated soil. The calculation methods of the post construction settlement on soft clay foundation are discussed. The calculation program on the operating deck of Matlab are programmed, the consolidation and settlement of the compound foundation associating the case history are analyzed and calculated, and the regularity of the consolidation and settlement on the soft soil foundation are discussed.(3) Analyzing the non-linear consolidation general equation and havingestablished the one-dimensional nonlinear consolidation basic equation considering the stress history.(4) Associating the case history and basing on the operating deck ofMatlab, the one-dimensional nonlinear consolidation basic equation of saturated soil is calculated and analyzed, and individually considering one-dimensional consolidation calculation that varies with the load and the thickness of the layers with the time, and considering one-dimensional consolidation calculation when the foundation is stratified, and solving one-dimensional consolidation equation considering the stress history. Some significant conclusions for the existent projects are gained.更多还原