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1、 分类号:U443.15 10710-2010121010 硕 士 学 位 论 文 高速铁路路基沉降现场测试与理论计算研究 刘 昭 导师姓名职称 雷胜友 教授 申请学位级别 硕士 学科专业名称 岩土工程 论文提交日期 2013年4月25日 论文答辩日期 2013年6月9日 学位授予单位 长安大学 Research on the subgrade settlement site testing and theoretical calculation of High-Speed Railway A Dissertation Submitted for the Degree of Master Ca
2、ndidate：Liu Zhao Supervisor：Prof. Lei Shengyou Changan University, Xian, China I 摘 要 CFG 桩复合地基在黄土地区高速铁路中得到了较大范围的推广， 高速铁路路基沉降要求较普通铁路更为严格，但相关的理论研究还不够完善，给高速铁路地基工后沉降的控制带来较多的困难。本研究依托在建的大西客运专线和已建的郑西客运专线，研究了高速铁路路基沉降控制技术，研究工作体现在了以下方面： 在高速铁路建设工程试验断面现场埋设压力盒、 沉降计、 柔性位移计、 单点位移计、沉降磁环等元器件，采集相关数据，并据此分析了试验断面桩间土压力和沉
3、降量、CFG桩身压力和压缩变形以及路堤上土工格栅变形情况。此外，结合郑西客运专线资料，采用双曲线法、三点法及 Asaoka 法三种回归分析法预测了试验断面的工后沉降，发现三种沉降回归预测方法沉降预测结果是可靠的。 对试验断面的 CFG 桩复合地基加固区采用分层总和法、复合模量法、弦线模量法进行沉降计算，并与实测沉降值进行了对比分析，发现几种计算方法所得沉降变化规律一致，弦线模量法所得沉降值与实测值接近，复合模量法经过修正也可以很好地反映路基的沉降。 针对复合地基沉降变形的特点， 用 2d-sigma 有限元分析软件进行了高速铁路路基的沉降计算，发现计算沉降值与实测值非常接近。并研究了荷载作用下
4、路基沉降的横向影响范围，一般可影响至路堤坡脚外侧一倍的路基宽度，计算选取路基两侧延伸至两倍路基宽度作为分析域进行数值分析。 关键词：关键词：CFG 桩桩柱锤扩孔桩复合地基柱锤扩孔桩复合地基、沉降、垫层作用、复合模量、弦线模量、沉降、垫层作用、复合模量、弦线模量 III Abstract CFG pile composite foundation has got a wide range of promotion in the high speed railway of the loess area, meanwhile embankment settlement requirements in
5、 the high speed railway is more strict than ordinary railway , but the related theoretical research is not enough perfect, which brings more problems for the control of the high speed railway post construction settlement foundation . This paper which is dependent on the built Zheng-Xi passenger line
6、 and the building Da-Xi passenger line studied the control technique of high speed railway subgrade settlement. Research work is reflected in the following aspects: Bury pressure box, meter, flexible displacement meter, single point displacement meter, copper components in the test section of the hi
7、gh-speed railway construction project ,collect relevant data, and analysis the earth pressure and settlement ,the stress of CFG pile and compression deformation , besides the changes of the geogrid on embankment deformation. In addition, it can find three regression subsidence forecast results are r
8、eliable by forecasting the post construction settlement of the test section using the hyperbolic method, three points and Asaoka method, three kinds of regression analysis method. It can find that several settlement calculation methods get consistent settlement of change rule, sedimentation values b
9、y using chord modulus method are close to the measured values and revised composite modulus method can well reflect the settlement of roadbed , which is drawn by settlement calculation using stratified summation method, the composite modulus method, chord modulus method and comparation with the meas
10、ured values. It can find the calculated subsidence value is very close to the measured value, by calculating high-speed railway subgrade settlement using 2d-sigma analysising software, according to the characteristics of composite foundation settlement. Then it can find the lateral impact can genera
11、lly spread lateral double roadbed width in the embankment slope by studying the lateral impact load under the action of embankment settlement, through the calculation choosing embankment on both sides extends to twice the roadbed width as the analysis domain for numerical analysis. Key words： CFG pi
12、leColumn pile hammer expansion composite foundation； Settlement ；Cushion effect；Composite modulus method；Chord modulus method V 目目 录录 第一章 绪论 . 1 1.1 选题背景和意义 . 1 1.2 国内外相关研究现状 . 2 1.2.1 复合地基理论 . 3 1.2.2 高铁沉降分析研究现状 . 3 1.3 本文的主要研究内容 . 5 第二章 高速铁路 CFG 桩复合地基沉降特点研究 . 7 2.1 引言 . 7 2.2 高速铁路路基沉降变形的特点及机理 . 7 2.2.1 高速铁路路基沉降特点 . 7 2.2.2 CFG 桩复合地基桩土变形机理 . 7 2.2.3 CFG 桩复合地基加固机理 . 9 2.2.4 CFG 桩复合地基负摩阻力作用机理 . 10 2.2.5 沉降组成分析 . 12 2.3 沉降计算理论分析 .
