發(fā)布時間：2018-02-25 07:04

  本文關鍵詞： 地鐵隧道 淺埋暗挖 數值模擬 灰關聯(lián)分析　出處：《蘭州交通大學》2017年碩士論文　論文類型：學位論文

【摘要】：經濟高速發(fā)展的今天,能不能擁有更為便利、快捷的交通已經越來越成為制約地區(qū)經濟發(fā)展的關鍵。發(fā)展以地鐵為主的城市軌道交通作為解決城區(qū)交通擁堵問題解決方式已經越來越多的被運用于我國的大中型城市,蘭州地區(qū)地質情況特殊,地鐵修建過程往往伴隨著著地表沉降、拱頂沉降、周邊收斂、隧道底部隆起、建筑物變形、深層沉降、地表水平位移、襯砌變形和地下管線變形等。地層的沉降可能引起地表開裂甚至塌陷,同時,地層的沉降也會使地下市政管線隨地層而沉降,而不均勻的沉降則會導致管線的滲漏甚至破裂;另外,土層的不均勻沉降還會導致地上建筑物傾斜、開裂變形等。所以對于地表、地層的變形規(guī)律研究就具有其現實意義。本文以蘭州地鐵淺埋暗挖區(qū)間隧道為背景,對淺埋暗挖地鐵隧道施工過程進行了數值分析模擬,并結合隧道修建過程中第三方監(jiān)測的實測數據進行了變形預測分析。本文主要研究內容及成果如下:(1)分析總結了現場監(jiān)測數據,隧道開挖的超前影響約占最終沉降值的5%~10%,左右線隧道相繼開挖期間的沉降量約占最終沉降量的55~80%;開挖完成后沉降值約占最終沉降量的12~28%,開挖階段的沉降變形是地表沉降變形的主要部分,合理的控制臺階長度,并盡量縮短襯砌封閉成環(huán)時間能有效控制地表沉降。(2)運用不同類型的函數對地表沉降、拱頂沉降、水平收斂實測數據進行擬合回歸分析,并且預測了最終變形值。從擬合的效果來看,Boltzmann函數對于地表變形、拱頂沉降都表現出更好的相關性,倒指數函數對于收斂的則表現出更好的相關性。運用PECK公式進行了地表橫向變形的回歸分析。(3)結合蘭州地鐵一號線拱星墩~焦家灣區(qū)間淺埋暗挖段工程實例,參考實際施工情況,運用有限元分析軟件GTS-NX建立三維實體模型,對施工過程引起的地表、地層沉降變形分縱向和橫向進行了研究總結。(4)對數值模擬和現場監(jiān)測數據進行了對比分析,從結果來看二者所反應測點的變形規(guī)律基本一致,可以通過數值分析可以來超前預測隧道施工引起的地層的沉降規(guī)律。做了現場圍巖及支護結構的現場測試,得出了圍巖與初支的接觸壓力及格柵拱架中鋼筋受力規(guī)律。(5)采用二維數值模擬方式分析了雙線隧道凈距、襯砌的彈性模量、圍巖的彈性模量以及隧道的埋深對地表變形的影響,并對地表變形規(guī)律做了總結。采用灰關聯(lián)分析法對不同影響因素下的地表最大沉降變形進行了敏感性分析,從關聯(lián)度序列中可以看出,影響地表最大沉降值的諸多因素中,隧道埋深的影響最大,其次分別是襯砌混凝土彈性模量、圍巖彈性模量、雙線隧道凈距。
[Abstract]:Today, when the economy is developing at a high speed, can it be more convenient? Rapid traffic has become the key to restrict the regional economic development. The development of subway based urban rail transit as a solution to the problem of urban traffic congestion has been used in more and more large and medium-sized cities in China. The geological conditions of Lanzhou area are special. The construction process of subway is often accompanied by ground subsidence, dome settlement, circumjacent convergence, tunnel bottom uplift, building deformation, deep settlement, surface horizontal displacement, etc. Lining deformation and underground pipeline deformation. Ground settlement may cause surface cracking or even collapse, at the same time, stratum settlement will also make underground municipal pipeline layer and settlement, and uneven settlement will lead to pipeline leakage or even rupture; In addition, the uneven settlement of the soil layer will also lead to the slope of the ground building, cracking and deformation, etc. Therefore, for the ground surface, the study of the deformation law of the ground has its practical significance. This paper takes the shallow buried underground tunnel of Lanzhou Metro as the background. Numerical analysis and simulation of the construction process of shallow buried underground subway tunnel are carried out. Combined with the measured data of the third party monitoring during the tunnel construction, the deformation prediction analysis is carried out. The main contents and results of this paper are as follows: 1) the field monitoring data are analyzed and summarized. The advance influence of tunnel excavation accounts for about 5% of the final settlement value. The settlement of the left and right tunnels during successive excavation accounts for 55% of the final settlement. After excavation, the settlement value accounts for about 12% of the final settlement, and the settlement deformation in the excavation stage is the ground. The main part of surface subsidence and deformation, The surface subsidence can be effectively controlled by controlling the length of the steps reasonably and shortening the closing time of the lining.) by using different types of functions, the measured data of surface subsidence, dome settlement and horizontal convergence are analyzed by fitting regression analysis. And the final deformation value is predicted. The Boltzmann function shows a better correlation to the surface deformation and the dome settlement. The inverse exponential function shows a better correlation to convergent ones. The regression analysis of the transverse deformation of the ground surface is carried out by using the PECK formula. Combined with the engineering example of the shallow buried subsurface excavation section between the arch star pier and Jiaojia Bay section of Lanzhou Metro Line 1, Referring to the actual construction situation, using the finite element analysis software GTS-NX to set up the three-dimensional solid model, for the surface caused by the construction process, The paper compares and analyzes the numerical simulation data and the field monitoring data. The results show that the deformation law of the measured points is basically the same. Numerical analysis can be used to predict the settlement law of strata caused by tunnel construction in advance. The site test of surrounding rock and supporting structure has been done. The contact pressure between surrounding rock and initial support and the stress law of reinforcement in grid arch frame are obtained. The effects of net distance, elastic modulus of lining, elastic modulus of surrounding rock and buried depth of tunnel on surface deformation are analyzed by two-dimensional numerical simulation. In this paper, the law of surface deformation is summarized. The sensitivity analysis of surface maximum settlement under different influence factors is carried out by using grey correlation analysis. From the correlation degree series, it can be seen that among the many factors that affect the maximum subsidence value of the surface, The influence of tunnel depth is the most, followed by the elastic modulus of lining concrete, the elastic modulus of surrounding rock and the net distance of double-line tunnel.
【學位授予單位】：蘭州交通大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U456.3;U231.3

【參考文獻】

相關期刊論文 前10條

1 蔡佳愿;周傳波;吳超;;雙線平行地鐵隧道盾構同向推進縱向安全間距研究[J];長江科學院院報;2016年12期

2 李濤;嵇長民;冀文歡;張文強;龔文波;萬燁;;地鐵隧道暗挖施工地表沉降模擬分析[J];桂林理工大學學報;2016年04期

3 翁效林;王俊;王立新;張玉偉;;黃土地層浸水濕陷對地鐵隧道影響試驗研究[J];巖土工程學報;2016年08期

4 王忠昶;趙德深;吳會軍;;近距隧道暗挖施工誘發(fā)地層變形規(guī)律的模型試驗研究[J];中國鐵道科學;2013年06期

5 孔祥興;夏才初;仇玉良;張麗英;龔建伍;;平行小凈距盾構與CRD法黃土地鐵隧道施工力學研究[J];巖土力學;2011年02期

6 聶衛(wèi)平;徐衛(wèi)亞;周先齊;;基于三維彈塑性有限元的洞室穩(wěn)定性參數敏感性灰關聯(lián)分析[J];巖石力學與工程學報;2009年S2期

7 王紹君;劉宗仁;陶夏新;;淺埋暗挖隧道施工性態(tài)的數值模擬與分析[J];土木工程學報;2007年06期

8 姚宣德;王夢恕;;地鐵淺埋暗挖法施工引起的地表沉降控制標準的統(tǒng)計分析[J];巖石力學與工程學報;2006年10期

9 魏綱,徐日慶;軟土隧道盾構法施工引起的縱向地面變形預測[J];巖土工程學報;2005年09期

10 李圍,何川,張志強;大型地下結構下修建盾構隧道模型試驗[J];西南交通大學學報;2005年04期

相關博士學位論文 前2條

1 鄭甲佳;黃土地區(qū)淺埋暗挖地鐵區(qū)間隧道結構體系受力特征研究[D];長安大學;2011年

2 施成華;城市隧道施工地層變形時空統(tǒng)一預測理論及應用研究[D];中南大學;2007年

相關碩士學位論文 前2條

1 孫壽榜;近距離隧道施工對既有隧道結構安全性影響研究[D];蘭州交通大學;2014年

2 李海峰;淺埋暗挖隧道施工地表沉降的規(guī)律及其對既有構筑物的影響分析[D];北京交通大學;2008年

，

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