客运专线论文大西客运专线黄土路基加固措施研究.doc

客运专线论文：大西客运专线黄土路基加固措施研究【中文摘要】本文以大西客运专线为工程依托,对黄土地基加固措施进行了简要的理论分析,对试验段黄土路基加固措施的设计、施工工艺和质量控制进行了具体的研究分析,运用数值模拟方法,对路基填筑各阶段的施工对地基沉降的影响进行了预测分析,论文主要做的工作如下：1.对试验段水泥土挤密以及CFG桩的布桩方式,试桩的工艺和质量控制的主要内容作了研究分析。对于水泥土挤密桩,在施工开始前,要对地质情况进行复核,确定填料的最优含水量以及影响桩身质量的其他因素如填料的粒径、施工工艺、施工时填料的保护措施等；施工完毕后对桩身的压实密度,桩间土的挤密系数、干密度以及湿陷性系数等进行了检测,结果表明,消除了黄土的湿陷性,增强了地基的承载力。对CFG桩,要注意影响其质量的一些因素,如施工工艺、砼的质量等；CFG桩试桩后对其进行了桩身的完整性,单桩承载力等进行了检测,结果表明达到设计要求。2.通过基于PLAXIS的有限元分析,对水泥土挤密桩和CFG桩联合加固大西客运专线黄土地基在路基填筑阶段的沉降进行了预测分析,数值分析表明：在路基填筑的各阶段,地基应力变化的最明显的加固是部分；地基沉降变化最大的在路基填筑阶段,路基填筑完毕后,沉降变化量较小,能够满足客运专线对工后沉降的要求。故通过现场结论以及数值模拟分析可知,此种复合地基加固措施可以在客运专线黄土地基加固处理中加以推广应用。【英文摘要】This paper briefly analysised the theoretical of loess roadbed reinforcement relying on Datong-Xian Passenger Dedicated Raiway engineering and concrete researched the design proposal,construction technology and quality control of loess roadbed reinforcement,then forcasted the foundation settlement at every level during constructing roadbed,the main research in the paper as follow:1.the paper researched the arrangement form of compacted cement pile and CFG pile,technology of test pile and the main content of quality control.For compacted cement pile,it should re-check the geological condition and confirm the optimum water content of filler and other factor that may influence on the quality of pile, such as diameter of particles,construction technology and protection measures of filler when constructing; After construction, we detected the compacted density of pile body and the compaction coefficient, dry density,coefficient of settlement of loess of soil between piles,the results showed that settlement of loess had been eliminated and reinforced the bearing capacity of foundation. For CFG pile it should pay more attention on the influencing factors of quality,such as construction technology,the quality of concrete and so on; we sampling inspection the pile integrity and bearing capacity of single pile of CFG pile after construction, the results showed that it reached the design requirements.2.through finite element analysis based on PLAXIS software,this paper prediction analyzed the settlement of Datong-Xian dedicated passenger railway loess foundation that reinforced by using soil-cement compacted piles combined with CFG pile in roadbed filling stage,numerical analysis shows that the part which foundation stress changed obviously is which had been reinforced; the loess foundation settlement which had been reinforced could meet the requirements of dedicated passenger railway. Therefore, through filed conclusion and numerical analysis we know that the this composite foundation reinforcement can be popularization and application in loess foundation of dedicated passenger railway.【关键词】客运专线 黄土地基 水泥土挤密桩 CFG桩 数值模拟 沉降【英文关键词】passenger dedicated railway loess foundation cement-soil compacted pile CFG pile numerical simulation settlement【目录】大西客运专线黄土路基加固措施研究摘要6-7Abstract7第一章 绪论10-161.1 选题背景10-111.2 客运专线路基地基处理概述111.3 客运专线黄土地基加固措施概述11-141.3.1 地基处理的主要目的和方法11-121.3.2 黄土的性质概述12-131.3.3 客运专线黄土路基特点131.3.4 客运专线黄土路基地基加固措施研究现状13-141.4 本文的研究目的、内容和方法14-161.4.1 研究目的141.4.2 研究内容14-151.4.3 研究方法15-16第二章 大西客运专线黄土路基主要加固措施及机理分析16-372.1 工程概况16-182.1.1 地形地貌162.1.2 地层岩性及参数16-172.1.3 水文地质特征及地震参数17-182.2 水泥土挤密桩18-292.2.1 水泥土挤密桩原理分析182.2.2 水泥土挤密桩的加固机理18-192.2.3 水泥土挤密桩的设计、影响因素及施工19-282.2.3.1 路基地基复合承载力20-252.2.3.2 水泥土挤密桩复合地基沉降控制计算25-272.2.3.3 水泥土挤密桩的影响因素及施工27-282.2.4 水泥土挤密桩的质量控制28-292.3 CFG桩29-372.3.1 CFG桩的加固机理及适用范围30-312.3.1.1 CFG桩的加固机理30-312.3.2 CFG桩设计及施工31-362.3.2.1 CFG桩设计计算31-352.3.2.2 CFG桩施工35-362.3.3 CFG桩质量控制36-37第三章 大西客运专线黄土路基试验段加固措施分析37-573.1 水泥土挤密桩及CFG联合应用加固黄土地基37-573.1.1 水泥土挤密桩及CFG复合地基设计37-383.1.2 水泥土挤密桩及CFG施工工艺38-493.1.2.1 水泥土挤密桩试桩工艺38-453.1.2.2 试验段水泥土挤密桩加固黄土地基效果分析45-493.1.3 CFG桩的的施工工艺49-513.1.4 CFG加固黄土地基的效果分析51-57第四章 基于PLAXIS的黄土地基加固效果数值模拟分析57-674.1 PLAXIS元软件计算原理57-584.2 计算模型58-604.2.1 建立模型584