發(fā)布時(shí)間：2018-02-25 07:04

  本文關(guān)鍵詞： 地鐵隧道 淺埋暗挖 數(shù)值模擬 灰關(guān)聯(lián)分析　出處：《蘭州交通大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：經(jīng)濟(jì)高速發(fā)展的今天,能不能擁有更為便利、快捷的交通已經(jīng)越來(lái)越成為制約地區(qū)經(jīng)濟(jì)發(fā)展的關(guān)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(wèn)題解決方式已經(jīng)越來(lái)越多的被運(yùn)用于我國(guó)的大中型城市,蘭州地區(qū)地質(zhì)情況特殊,地鐵修建過(guò)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(kāi)裂甚至塌陷,同時(shí),地層的沉降也會(huì)使地下市政管線隨地層而沉降,而不均勻的沉降則會(huì)導(dǎo)致管線的滲漏甚至破裂;另外,土層的不均勻沉降還會(huì)導(dǎo)致地上建筑物傾斜、開(kāi)裂變形等。所以對(duì)于地表、地層的變形規(guī)律研究就具有其現(xiàn)實(shí)意義。本文以蘭州地鐵淺埋暗挖區(qū)間隧道為背景,對(duì)淺埋暗挖地鐵隧道施工過(guò)程進(jìn)行了數(shù)值分析模擬,并結(jié)合隧道修建過(guò)程中第三方監(jiān)測(cè)的實(shí)測(cè)數(shù)據(jù)進(jìn)行了變形預(yù)測(cè)分析。本文主要研究?jī)?nèi)容及成果如下:(1)分析總結(jié)了現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù),隧道開(kāi)挖的超前影響約占最終沉降值的5%~10%,左右線隧道相繼開(kāi)挖期間的沉降量約占最終沉降量的55~80%;開(kāi)挖完成后沉降值約占最終沉降量的12~28%,開(kāi)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(tái)階長(zhǎng)度,并盡量縮短襯砌封閉成環(huán)時(shí)間能有效控制地表沉降。(2)運(yùn)用不同類型的函數(shù)對(duì)地表沉降、拱頂沉降、水平收斂實(shí)測(cè)數(shù)據(jù)進(jìn)行擬合回歸分析,并且預(yù)測(cè)了最終變形值。從擬合的效果來(lái)看,Boltzmann函數(shù)對(duì)于地表變形、拱頂沉降都表現(xiàn)出更好的相關(guān)性,倒指數(shù)函數(shù)對(duì)于收斂的則表現(xiàn)出更好的相關(guān)性。運(yùn)用PECK公式進(jìn)行了地表橫向變形的回歸分析。(3)結(jié)合蘭州地鐵一號(hào)線拱星墩~焦家灣區(qū)間淺埋暗挖段工程實(shí)例,參考實(shí)際施工情況,運(yùn)用有限元分析軟件GTS-NX建立三維實(shí)體模型,對(duì)施工過(guò)程引起的地表、地層沉降變形分縱向和橫向進(jìn)行了研究總結(jié)。(4)對(duì)數(shù)值模擬和現(xiàn)場(chǎng)監(jiān)測(cè)數(shù)據(jù)進(jìn)行了對(duì)比分析,從結(jié)果來(lái)看二者所反應(yīng)測(cè)點(diǎn)的變形規(guī)律基本一致,可以通過(guò)數(shù)值分析可以來(lái)超前預(yù)測(cè)隧道施工引起的地層的沉降規(guī)律。做了現(xiàn)場(chǎng)圍巖及支護(hù)結(jié)構(gòu)的現(xiàn)場(chǎng)測(cè)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(shù)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(duì)地表變形的影響,并對(duì)地表變形規(guī)律做了總結(jié)。采用灰關(guān)聯(lián)分析法對(duì)不同影響因素下的地表最大沉降變形進(jìn)行了敏感性分析,從關(guān)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(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U456.3;U231.3

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