客運專線論文大西客運專線黃土路基加固措施研究.doc

客運專線論文：大西客運專線黃土路基加固措施研究【中文摘要】本文以大西客運專線為工程依托,對黃土地基加固措施進行了簡要的理論分析,對試驗段黃土路基加固措施的設計、施工工藝和質量控制進行了具體的研究分析,運用數值模擬方法,對路基填筑各階段的施工對地基沉降的影響進行了預測分析,論文主要做的工作如下：1.對試驗段水泥土擠密以及CFG樁的布樁方式,試樁的工藝和質量控制的主要內容作了研究分析。對于水泥土擠密樁,在施工開始前,要對地質情況進行復核,確定填料的最優(yōu)含水量以及影響樁身質量的其他因素如填料的粒徑、施工工藝、施工時填料的保護措施等；施工完畢后對樁身的壓實密度,樁間土的擠密系數、干密度以及濕陷性系數等進行了檢測,結果表明,消除了黃土的濕陷性,增強了地基的承載力。對CFG樁,要注意影響其質量的一些因素,如施工工藝、砼的質量等；CFG樁試樁后對其進行了樁身的完整性,單樁承載力等進行了檢測,結果表明達到設計要求。2.通過基于PLAXIS的有限元分析,對水泥土擠密樁和CFG樁聯合加固大西客運專線黃土地基在路基填筑階段的沉降進行了預測分析,數值分析表明：在路基填筑的各階段,地基應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,能夠滿足客運專線對工后沉降的要求。故通過現場結論以及數值模擬分析可知,此種復合地基加固措施可以在客運專線黃土地基加固處理中加以推廣應用?！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.【關鍵詞】客運專線 黃土地基 水泥土擠密樁 CFG樁 數值模擬 沉降【英文關鍵詞】passenger dedicated railway loess foundation cement-soil compacted pile CFG pile numerical simulation settlement【目錄】大西客運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 客運專線路基地基處理概述111.3 客運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 黃土的性質概述12-131.3.3 客運專線黃土路基特點131.3.4 客運專線黃土路基地基加固措施研究現狀13-141.4 本文的研究目的、內容和方法14-161.4.1 研究目的141.4.2 研究內容14-151.4.3 研究方法15-16第二章 大西客運專線黃土路基主要加固措施及機理分析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16-172.1.3 水文地質特征及地震參數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理18-192.2.3 水泥土擠密樁的設計、影響因素及施工19-282.2.3.1 路基地基復合承載力20-252.2.3.2 水泥土擠密樁復合地基沉降控制計算25-272.2.3.3 水泥土擠密樁的影響因素及施工27-282.2.4 水泥土擠密樁的質量控制28-292.3 CFG樁29-372.3.1 CFG樁的加固機理及適用范圍30-312.3.1.1 CFG樁的加固機理30-312.3.2 CFG樁設計及施工31-362.3.2.1 CFG樁設計計算31-352.3.2.2 CFG樁施工35-362.3.3 CFG樁質量控制36-37第三章 大西客運專線黃土路基試驗段加固措施分析37-573.1 水泥土擠密樁及CFG聯合應用加固黃土地基37-573.1.1 水泥土擠密樁及CFG復合地基設計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值模擬分析57-674.1 PLAXIS元軟件計算原理57-584.2 計算模型58-604.2.1 建立模型584