DOC《毕业论文》

毕业论文市政道路软基处理 及沉降预测方法探讨 专业年级 05级土木(1)班 学生学号___0

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1 2 7____ 学生姓名 储定保指导教师 余湘娟评阅人朱珍德二九年五月 中国 南京 摘要 本文以练市到杭州段某公路堆载预压软土地基为工程背景,针对软土地基的处理方法、沉降分析和预测这一课题,采用了现场监测和理论研究相结合的方法,进行了较为系统地探讨.

主要工作有: 1.对现有软土地基处理方法的适用范围、加固机理和效果进行了阐述,并对他们进行了比较;

2.主固结沉降配合经验系数修正的地基沉降的计算方法是被工程师们所广泛采用的,但准确程度依赖于经验系数的选取;

3.结合线路工程地质条件和设计情况,合理选择监测断面,制定切实可行的监测方案;

4.采用分层总和法计算地基的主固结沉降量,采用修正太沙基固结度公式计算平均固结度,对比分析了理论沉降和实测沉降,拟合了次固结沉降曲线,从而证明了考虑次固结修正地基沉降的简化计算模型的可行性. 关键词: 软土路基 沉降预测 堆载预压 现场监测 曲线拟合 Abstract The sixth contract section of the Lian (Lian city)-Hang (hangzhou) expressway was taken as the project background in this article, and the preloading method was used to strengthen the soft soil subgrade. To the subject in analyzing and predicting for settlements of the soft ground bed, the method which combined live monitor and theoretical research was studied in system. The groundwork is as follows: 1.The scope of the application and the mechanism and effects of reinforcemet of the ground treatment which was compared was described;

2.The method which calculated the consolidation settlement with the main coefficient of consolidation is widely adopped by the engineers, but the accuracy of the calculation depends on the selection of the coefficient;

3.After considering geological conditions and design situations of the project comprehensively, the monitor section was chosen rationally and a feasible monitoring scheme was made;

4.The Layerwise summation method was used to calculate the main foundation settlement;

The modified Terzaghi average consolidation degree was use to calculate the consolidation degree;

The theoretical and measured settlement was comparatively analysised;

A second solid-end settlement curve was fitted;

Finally it proves that the amendment to consider secondary consolidation of the feasibility of simplifying the calculation model. key words: soft soil subgrade;

settlement prediction;

mound preloading method;

live monitor;

curve fitting method 目录

第一章 绪论

1 1.1 研究目的和意义

1 1.2 固结理论的发展

1 1.3 现有的软土地基处理方法

3 1.4 沉降计算方法以及反分析理论的研究现状

3 1.5 本文的主要工作

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第二章 各种软土地基处理方法及适用范围

5 2.1 软土地基处理的对象

5 2.2 各种软土地基处理方法及其适用性

6 2.3 常用软基处理方法的比较

9 2.4 选择地基处理方法时应考虑的条件

10 2.4.1 地基条件

10 2.4.2 道路条件

11 2.4.3 施工条件

11 2.5 本章小结

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第三章 软土地基沉降分析方法

13 3.1 排水固结法加固地基分析

13 3.2 一维沉降公式的建立

14 3.2.1 无侧向变形条件下单向压缩量计算假设

14 3.2.2 单向压缩量公式

14 3.2.3沉降量分类计算法