双向增强体复合地基的设计与PFC模拟

发布时间：2018-03-27 19:38

本文选题：地基处理　切入点：复合地基　出处：《湖北工业大学》2017年硕士论文

【摘要】：伴随着工程建设的发展,对地基的要求越来越高,上部结构已经发展的相当完善了,所以土木工程界的研究中心逐渐由地上转为地下,地基承载力的大小决定了上部结构能修建多高,软土地基是土木工程建设中经常遇到的问题之一。“CFG桩+土工格栅”双向增强体复合地基作为刚是现如今工程上应用最广泛的复合地基。本文对“CFG桩+土工格栅”复合地基进行工程上的应用,具有重要的实际意义。本文首先以地基处理的概念入手,以双向增强体复合地基为主线,通过总结大量的相关文献,系统阐述了地基处理的主要方法、双向增强体复合地基的概念及其性状,并简要介绍了CFG桩和土工格栅的特点和应用。以武汉xZ口至孝感高速公路标段AK0+006~AK0+040为工程背景,进行了“CFG桩+土工格栅”双向增强体复合地基的设计,并通过现有的理论对设计复合地基进行理论上的承载力及沉降计算。最后,采用PFC软件建立了“CFG桩+土工格栅”加固软土地基的分析模型,通过施加不同的荷载作用,分析了“CFG桩+土工格栅”复合地基的变形特性。本文通过理论计算和数值仿真模拟计算,得到本文设计的“CFG桩+土工格栅”复合地基的承载力、沉降量以及地基的稳定性都达到了工程要求。
[Abstract]:With the development of engineering construction, the demand for foundation is getting higher and higher, and the superstructure has been developed quite well, so the research center of civil engineering has gradually changed from above ground to underground. The bearing capacity of the foundation determines how high the superstructure can be built. Soft soil foundation is one of the common problems in civil engineering construction. "CFG pile geogrid" bidirectional reinforced composite foundation is the most widely used composite foundation in today's engineering. This paper deals with "CFG pile geogrid". The application of composite foundation in engineering, This paper begins with the concept of foundation treatment, takes the two-way reinforced composite foundation as the main line, and systematically expounds the main methods of foundation treatment through summing up a large number of relevant documents. This paper introduces the concept and characteristics of two-way reinforced composite foundation, and briefly introduces the characteristics and application of CFG pile and geogrid. Taking the AK0 006~AK0 040 section of Wuhan XZ Kou to Xiaogan Expressway as the engineering background, The design of "CFG pile geogrid" bidirectional reinforced composite foundation is carried out, and the theoretical bearing capacity and settlement of the designed composite foundation are calculated through existing theories. The analysis model of "CFG pile geogrid" for strengthening soft soil foundation is established by using PFC software. The deformation characteristics of "CFG pile geogrid" composite foundation are analyzed. The bearing capacity of "CFG pile geogrid" composite foundation designed in this paper is obtained by theoretical calculation and numerical simulation. The settlement and the stability of the foundation meet the engineering requirements.
【学位授予单位】：湖北工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU47

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