本文選題：重載鐵路 + 黃土隧道　； 參考：《北京交通大學》2017年碩士論文

【摘要】：隨著國家西部開發(fā)的不斷深入以及路網(wǎng)的逐漸完善,重載鐵路建設(shè)快速進入西北黃土多山地區(qū),為滿足行車需要,實現(xiàn)克服高差、縮短里程及優(yōu)化線性指標的目的,隧道的修建必不可少。目前,國內(nèi)外對重載鐵路的研究主要集中在軌道、路基和橋梁上,關(guān)于重載鐵路對黃土隧道基底影響的研究較少。我國既有重載鐵路隧道的基底設(shè)計缺少完善的規(guī)范指導,導致在鐵路運營期間,部分隧道出現(xiàn)底部開裂破損、翻漿冒泥、下陷等病害,隨著軸重增大、運量提高后,這種現(xiàn)象將更加明顯,因此對重載鐵路黃土隧道復合基底的深入研究具有重要工程意義。本文以大準至朔黃鐵路聯(lián)絡(luò)線中位于濕陷性黃土區(qū)淺埋偏壓段的柳條山隧道為工程背景,對灰土擠密樁復合基底沉降控制進行了分析,通過室內(nèi)試驗研究了重塑黃土的工程特性及力學參數(shù),分別采用理論公式和數(shù)值模擬計算了復合基底沉降量及變化規(guī)律,分析了灰土擠密樁參數(shù)設(shè)計對復合基底沉降的影響。本文所做的具體工作及主要研究成果如下:1.在搜集和查閱文獻資料基礎(chǔ)上,總結(jié)分析了國內(nèi)外重載鐵路運輸發(fā)展現(xiàn)狀、黃土隧道復合基底加固及灰土擠密樁的應(yīng)用等方面的研究進展,提出了本文的研究內(nèi)容及技術(shù)路線。2.重塑黃土的室內(nèi)滲透試驗和三軸剪切試驗結(jié)果表明,重塑黃土的彈性模量與含水率和壓實度呈線性關(guān)系,黏聚力與含水率和壓實度呈指數(shù)關(guān)系,并為復合基底數(shù)值模擬提供了樁間土力學參數(shù)。3.建立了重載鐵路黃土隧道復合基底沉降計算模型,確定了復合基底荷載條件,通過角點法計算了復合基底附加應(yīng)力,由分層總和法計算得到了黃土隧道復合基底的沉降量。4.分別建立了隧道基底在不同進深處天然黃土地基和灰土擠密樁復合地基的有限元數(shù)值分析模型,分析了地層結(jié)構(gòu)、樁端位置對隧道基底沉降的影響規(guī)律,確定了沉降量最大位置在隧道洞口處,并對灰土擠密樁的對隧道基底沉降控制效果進行了研究。5.結(jié)合柳條山隧道工程實例,確定了影響復合基底沉降的參數(shù)及其合理取值范圍,基于正交方法設(shè)計試驗方案,對各參數(shù)進行了顯著性檢驗,得到了樁長變化對基底沉降影響最顯著,分析得到了復合基底沉降量與參數(shù)的變化呈指數(shù)關(guān)系,并結(jié)合沉降規(guī)律對柳條山隧道復合基底的設(shè)計提出了優(yōu)化方案。
[Abstract]:With the development of western China and the gradual improvement of the road network, the construction of heavy-haul railway has rapidly entered the mountainous region of loess in northwest China. In order to meet the requirements of driving, overcome the height difference, shorten mileage and optimize the linear index, the railway construction of heavy haul has entered into the northwest loess mountainous area rapidly. The construction of the tunnel is indispensable. At present, the research on heavy-haul railway is mainly focused on track, roadbed and bridge at home and abroad, but there is little research on the influence of heavy-haul railway on the foundation of loess tunnel. The foundation design of the existing heavy-haul railway tunnel in our country lacks perfect standard guidance, which leads to the cracking and damage at the bottom of some tunnels during the period of railway operation, such as cracking and damage of bottom, mud and mud, subsidence and so on. With the increase of axle load, the volume of transportation increases. This phenomenon will be more obvious, so it is of great engineering significance to study the composite basement of heavy haul railway loess tunnel. Based on the Liutiaoshan Tunnel located in shallow buried partial pressure section of collapsible loess area in the connection line between Dazheng and Shuohuang railway, this paper analyzes the settlement control of composite foundation of lime-soil compaction pile. The engineering characteristics and mechanical parameters of remolded loess were studied through laboratory tests. The settlement and variation law of composite foundation were calculated by theoretical formula and numerical simulation, and the influence of parameters design of lime soil compaction pile on composite foundation settlement was analyzed. The specific work and main research results of this paper are as follows: 1. On the basis of collecting and consulting literature, this paper summarizes and analyzes the development status of heavy-haul railway transportation at home and abroad, the reinforcement of composite foundation of loess tunnel and the application of lime-soil compaction pile, and puts forward the research content and technical route of this paper. The results of laboratory permeability test and triaxial shear test show that the elastic modulus of remolded loess is linearly related to moisture content and compactness, and cohesion is exponentially related to moisture content and compactness. The soil mechanics parameters. 3. 3 are provided for the numerical simulation of composite foundation. The calculation model of composite foundation settlement of heavy duty railway loess tunnel is established, the load condition of composite foundation is determined, the additional stress of composite foundation is calculated by corner point method, and the settlement of composite foundation of loess tunnel is calculated by the method of stratified summation. The finite element numerical analysis models of natural loess foundation and lime-soil compacted pile composite foundation are established in different depths of tunnel foundation, and the influence of stratum structure and pile end position on the settlement of tunnel base is analyzed. The maximum settlement is determined at the entrance of the tunnel, and the control effect of the lime-soil compaction pile on the settlement of the tunnel base is studied. Combined with the example of Liutiaoshan tunnel project, the parameters affecting the settlement of the composite basement and its reasonable value range are determined. Based on the orthogonal design test scheme, the significance of each parameter is tested. The variation of pile length has the most significant influence on the settlement of the foundation, and the exponential relationship between the settlement of the composite foundation and the parameters is obtained, and the optimization scheme for the design of the composite foundation of the Liutiaoshan tunnel is put forward in combination with the settlement law.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U452.2

【參考文獻】

相關(guān)期刊論文 前10條

1 賈宏錚;;硅化法加固黃土過程土體抗剪強度和濕陷變形研究[J];山西建筑;2016年28期

2 郭延斌;;鐵路隧道基底病害的形成原因及整治對策研究[J];江西建材;2016年07期

3 袁媛;;談灰土擠密樁施工技術(shù)及其質(zhì)量控制措施[J];山西建筑;2016年10期

4 胡小平;鄧成堯;韓金剛;劉映安;李淑華;;大秦鐵路重載運輸分析與啟示[J];交通運輸工程與信息學報;2015年02期

5 石中平;;垂直均布荷載矩形基礎(chǔ)地基任意點附加應(yīng)力系數(shù)公式推導[J];成都理工大學學報(自然科學版);2015年02期

6 趙旭峰;;重載鐵路軌道技術(shù)發(fā)展趨勢及需要關(guān)注的問題[J];中國鐵路;2014年11期

7 趙文強;黃志軍;;灰土擠密樁復合地基浸水載荷試驗研究[J];路基工程;2014年05期

8 高建偉;余宏明;李科;;黃土無側(cè)限抗壓強度的試驗研究[J];安全與環(huán)境工程;2014年04期

9 裴增壯;艾兵;陽佳林;吳宗華;;濕陷性黃土地基處理方案比選與設(shè)計[J];建筑技術(shù);2014年07期

10 康熊;宣言;;我國重載鐵路技術(shù)發(fā)展趨勢[J];中國鐵路;2013年06期

相關(guān)會議論文 前1條

1 楊明群;;淺談灰土擠密樁與DDC樁在工程實踐中應(yīng)用與發(fā)展[A];2002年中國西北部重大工程地質(zhì)問題論壇論文集[C];2002年

相關(guān)重要報紙文章 前1條

1 王雄;趙妮娜;;我國鐵路27噸軸重貨運列車邁入國際重載鐵路先進行列[N];人民鐵道;2014年

相關(guān)博士學位論文 前1條

1 王小軍;黃土地區(qū)高速鐵路建設(shè)中的重大工程地質(zhì)問題研究[D];蘭州大學;2008年

相關(guān)碩士學位論文 前7條

1 洪勃;濕陷性馬蘭黃土滲透性試驗研究[D];長安大學;2016年

2 李軍;抗剪強度指標試驗分析及在支護工程中的應(yīng)用[D];河北工程大學;2014年

3 黃樹明;山區(qū)鐵路開展重載運輸相關(guān)問題研究[D];西南交通大學;2014年

4 李川;水泥土擠密樁在黃土隧道基底加固中的應(yīng)用研究[D];西南交通大學;2009年

5 李平;飽和黃土的三軸滲透試驗研究[D];西北農(nóng)林科技大學;2007年

6 龐烈鑫;樹根樁在黃土隧道基底加固中的應(yīng)用研究[D];西南交通大學;2006年

7 羅世毅;水平層狀地基中附加應(yīng)力與沉降計算分析[D];長安大學;2003年

，

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