客運(yùn)專線論文大西客運(yùn)專線黃土路基加固措施研究.doc

客運(yùn)專線論文：大西客運(yùn)專線黃土路基加固措施研究【中文摘要】本文以大西客運(yùn)專線為工程依托,對黃土地基加固措施進(jìn)行了簡要的理論分析,對試驗(yàn)段黃土路基加固措施的設(shè)計(jì)、施工工藝和質(zhì)量控制進(jìn)行了具體的研究分析,運(yùn)用數(shù)值模擬方法,對路基填筑各階段的施工對地基沉降的影響進(jìn)行了預(yù)測分析,論文主要做的工作如下：1.對試驗(yàn)段水泥土擠密以及CFG樁的布樁方式,試樁的工藝和質(zhì)量控制的主要內(nèi)容作了研究分析。對于水泥土擠密樁,在施工開始前,要對地質(zhì)情況進(jìn)行復(fù)核,確定填料的最優(yōu)含水量以及影響樁身質(zhì)量的其他因素如填料的粒徑、施工工藝、施工時(shí)填料的保護(hù)措施等；施工完畢后對樁身的壓實(shí)密度,樁間土的擠密系數(shù)、干密度以及濕陷性系數(shù)等進(jìn)行了檢測,結(jié)果表明,消除了黃土的濕陷性,增強(qiáng)了地基的承載力。對CFG樁,要注意影響其質(zhì)量的一些因素,如施工工藝、砼的質(zhì)量等；CFG樁試樁后對其進(jìn)行了樁身的完整性,單樁承載力等進(jìn)行了檢測,結(jié)果表明達(dá)到設(shè)計(jì)要求。2.通過基于PLAXIS的有限元分析,對水泥土擠密樁和CFG樁聯(lián)合加固大西客運(yùn)專線黃土地基在路基填筑階段的沉降進(jìn)行了預(yù)測分析,數(shù)值分析表明：在路基填筑的各階段,地基應(yīng)力變化的最明顯的加固是部分；地基沉降變化最大的在路基填筑階段,路基填筑完畢后,沉降變化量較小,能夠滿足客運(yùn)專線對工后沉降的要求。故通過現(xiàn)場結(jié)論以及數(shù)值模擬分析可知,此種復(fù)合地基加固措施可以在客運(yùn)專線黃土地基加固處理中加以推廣應(yīng)用?！居⑽恼縏his 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.【關(guān)鍵詞】客運(yùn)專線 黃土地基 水泥土擠密樁 CFG樁 數(shù)值模擬 沉降【英文關(guān)鍵詞】passenger dedicated railway loess foundation cement-soil compacted pile CFG pile numerical simulation settlement【目錄】大西客運(yùn)專線黃土路基加固措施研究摘要6-7Abstract7第一章 緒論10-161.1 選題背景10-111.2 客運(yùn)專線路基地基處理概述111.3 客運(yùn)專線黃土地基加固措施概述11-141.3.1 地基處理的主要目的和方法11-121.3.2 黃土的性質(zhì)概述12-131.3.3 客運(yùn)專線黃土路基特點(diǎn)131.3.4 客運(yùn)專線黃土路基地基加固措施研究現(xiàn)狀13-141.4 本文的研究目的、內(nèi)容和方法14-161.4.1 研究目的141.4.2 研究內(nèi)容14-151.4.3 研究方法15-16第二章 大西客運(yùn)專線黃土路基主要加固措施及機(jī)理分析16-372.1 工程概況16-182.1.1 地形地貌162.1.2 地層巖性及參數(shù)16-172.1.3 水文地質(zhì)特征及地震參數(shù)17-182.2 水泥土擠密樁18-292.2.1 水泥土擠密樁原理分析182.2.2 水泥土擠密樁的加固機(jī)理18-192.2.3 水泥土擠密樁的設(shè)計(jì)、影響因素及施工19-282.2.3.1 路基地基復(fù)合承載力20-252.2.3.2 水泥土擠密樁復(fù)合地基沉降控制計(jì)算25-272.2.3.3 水泥土擠密樁的影響因素及施工27-282.2.4 水泥土擠密樁的質(zhì)量控制28-292.3 CFG樁29-372.3.1 CFG樁的加固機(jī)理及適用范圍30-312.3.1.1 CFG樁的加固機(jī)理30-312.3.2 CFG樁設(shè)計(jì)及施工31-362.3.2.1 CFG樁設(shè)計(jì)計(jì)算31-352.3.2.2 CFG樁施工35-362.3.3 CFG樁質(zhì)量控制36-37第三章 大西客運(yùn)專線黃土路基試驗(yàn)段加固措施分析37-573.1 水泥土擠密樁及CFG聯(lián)合應(yīng)用加固黃土地基37-573.1.1 水泥土擠密樁及CFG復(fù)合地基設(shè)計(jì)37-383.1.2 水泥土擠密樁及CFG施工工藝38-493.1.2.1 水泥土擠密樁試樁工藝38-453.1.2.2 試驗(yàn)段水泥土擠密樁加固黃土地基效果分析45-493.1.3 CFG樁的的施工工藝49-513.1.4 CFG加固黃土地基的效果分析51-57第四章 基于PLAXIS的黃土地基加固效果數(shù)值模擬分析57-674.1 PLAXIS元軟件計(jì)算原理57-584.2 計(jì)算模型58-604.2.1 建立模型584