土木工程 学院 岩土与地下工程 专业 3 班 胡延民 同学的毕业设计（论文）于 2010 年 06 月 日进行了答辩。
根据所提供的毕业设计（论文）材料、指导教师和评阅人意见以及在答辩过程中学生回答问题的情况，毕业设计（论文）答辩委员会（小组）做出如下决议。
一、毕业设计（论文）的总评语
二、毕业设计（论文）的总成绩： 三、答辩组组长签名：
答辩组成员签名：
答辩委员会主席： 签字（盖章） 年 月 日
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摘 要
随着我国近年来的经济和基础设施建设的发展，CFG桩复合地基技术在软土地基处理方面得到了越来越广泛的应用，并出现了很多理论和计算方法。但是由于影响CFG桩复合地基承载性状的不确定因素多、问题复杂且难度大，人们对它的认识还不够深入，使理论计算与工程实际存有较大差异，并且造成了在实际工程应用中的安全隐患或浪费，因此有必要对CFG桩复合地基承载性状进行进一步研究，使理论研究与实际相吻合并指导实践，从而达到安全适用、经济合理的目的。
本文以中华翰苑6#住宅楼楼为实例，介绍CFG桩加固软土的机理和复合地基的受力性状，概括CFG桩复合地基设计和计算的基本理论，利用这一原理，分析了桩体模量、桩长、置换率等对CFG桩复合地基承载性状的影响；说明了CFG桩在该地区进行地基处理的适用性和推广普及的可行性。 关键词：CFG桩；复合地基；筏板基础；地基处理
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Abstract
With China's recent economic and infrastructure development, CFG pile composite foundation in soft soil treatment has been more widely used, and there have been many theoretical and computational methods. However, due to impact of CFG pile composite foundation bearing capacity of the elements of uncertainty, the problem is complex and difficult, it is not enough in-depth understanding of it, so that theoretical and practical engineering there a big difference and resulted in the practical application security risks or waste, it is essential to CFG pile composite foundation bearing capacity for further research to theoretical research and practical guide practice kissing the merger, so as to achieve security for, the purpose of economic rationality.
In this paper, the Chinese Han Court Building 6 # residential buildings as an
example to introduce the soft soil CFG pile composite foundation of the mechanism and mechanical properties, general CFG pile composite foundation design and calculation of the basic theory, using the principle of pile model the amount of pile length, displacement rate on the CFG pile composite foundation traits; shows CFG pile foundation treatment in the region to promote universal applicability and feasibility.
Keywords: CFG pile; composite foundation; raft; ground treatment
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目 录
第一章 绪 论 .............................................................................................................. 1
1.1 问题的提出 ............................................................................................................ 1 1.2 常用地基处理技术 ............................................................................................... 1
1.2.1 地基处理方法的分类 ..................................................................................... 1 1.2.2 地基处理设计方案选择 ................................................................................. 1
1.3 CFG 桩复合地基处理技术现状 ........................................................................ 7 1.4研究目的及意义 .................................................................................................... 9 1.5 本设计的主要工作与设计思路 ....................................................................... 11
1.5.1 设计内容 ...................................................................................................... 11 1.5.2 设计思路 ...................................................................................................... 11
第二章 原始资料 ............................................................................................................... 13
2.1工程概况 ............................................................................................................... 13 2.2工程勘察情况 ....................................................................................................... 13
2.2.1 勘察目的与任务 .......................................................................................... 13 2.2.2岩土工程勘察等级确定 ................................................................................ 14 2.2.3勘察工程布置 ............................................................................................... 14 2.2.4勘探测试及取土方法简述 ............................................................................ 14 2.2.5勘察工作完成情况 ....................................................................................... 15
2.3场地工程地质条件 .............................................................................................. 16
2.3.1地形、地貌及地质构造条件 ........................................................................ 16 2.3.2水文地质条件 ............................................................................................... 16 2.3.3场地土冻结深度 ........................................................................................... 16 2.3.4不良地质作用 ............................................................................................... 17 2.3.5地下水腐蚀性评价 ....................................................................................... 17 2.3.6 活动断裂影响 .............................................................................................. 17 2.3.7 场地地震效应评价....................................................................................... 17
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2.4现场岩土工程分析与评价 ................................................................................. 18
2.4.1岩土参数的分析与选用 ................................................................................ 18 2.4.2．各层土承载力特征值及压缩性评价 .......................................................... 19 2.4.3各土层桩基参数 ........................................................................................... 21
第三章 筏板基础设计....................................................................................................... 24
3.1基础概述 ............................................................................................................... 24 3.2筏板基础的类型 .................................................................................................. 26 3.3筏板基础的结构设计.......................................................................................... 27 3.4筏板基础平面尺寸确定 ..................................................................................... 28
3.4.1筏板厚度 ....................................................................................................... 28 3.4.2筏板基础埋深及承载力的确定 .................................................................... 29 3.4.3筏板配筋 ....................................................................................................... 29 3.4.4 筏板的平面尺寸 .......................................................................................... 30 3.4.5天然筏板基础的变形计算 ............................................................................ 30 3.4.6筏板平面尺寸演算 ....................................................................................... 31
3.5筏板基础抗浮锚杆的设置 ................................................................................. 34 3.6筏板基础的施工与监测 ..................................................................................... 36
3.6.1筏板基础的施工 ........................................................................................... 36 3.6.2筏板基础的监测 ........................................................................................... 36
第四章 CFG桩复合地基设计 ........................................................................................... 38
4.1特点和适用范围 .................................................................................................. 38 4.2 CFG桩及其复合地基知识概述 ....................................................................... 38 4.3CFG桩复合地基加固机理 ................................................................................. 39
4.3.1 CFG桩加固机理 ........................................................................................... 39 4.3.2设置褥垫层的基本原理 ................................................................................ 39
4.4施工准备 ............................................................................................................... 40
4.4.1技术准备 ....................................................................................................... 40
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