發(fā)布時(shí)間：2018-03-13 07:17

  本文選題：螺旋隧道　切入點(diǎn)：有限元法　出處：《重慶交通大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：隧道建設(shè)受到地形、地質(zhì)等條件限制,利用自然展線或長大隧道都無法克服線路控制點(diǎn)間的高差時(shí),螺旋隧道具有更好的線形條件和滿足線形指標(biāo)的潛能,越來越受到重視。但螺旋隧道的應(yīng)用還比較少,需要進(jìn)行深入研究。本文基于重慶市渝中區(qū)大化路螺旋隧道這一工程背景,采用有限元方法,對(duì)螺旋隧道的線形曲率、開挖方法、左右線工作面間距、施工監(jiān)測(cè)等方面進(jìn)行了詳細(xì)的研究,主要的研究?jī)?nèi)容及結(jié)論如下:(1)確定了螺旋隧道最佳曲線半徑。螺旋隧道隨著線形半徑的減小表現(xiàn)出以下規(guī)律:圍巖受力越來越差;圍巖塑性區(qū)由無到有,塑性區(qū)面積不斷增大;隧道襯砌表現(xiàn)出的不對(duì)稱變形越來越明顯,初支體系受力增大。當(dāng)受條件所限必須采用螺旋隧道形式時(shí),建議結(jié)合地形條件盡量選取較大的線形半徑,使線形相對(duì)平緩。(2)確定了合理的開挖方法。通過對(duì)全斷面法、臺(tái)階法、CD法三種工法下螺旋隧道受力及變形分析可得:開挖過程中,圍巖及初支結(jié)構(gòu)的變形在三種工法下近似,且均沒有出現(xiàn)塑性區(qū),其中CD法下圍巖及初支結(jié)構(gòu)的變形略小,體現(xiàn)出一定的控制圍巖變形的能力;從初支結(jié)構(gòu)受力情況得出三種工法從優(yōu)到差的順序依次是CD法、臺(tái)階法、全斷面法。考慮到螺旋隧道的受力不對(duì)稱性,應(yīng)選用變形較為平緩的施工方法,避免急促變形的出現(xiàn),以免引起圍巖失穩(wěn)。(3)確定了隧道左右線施工開挖面的安全間距。左右線施工間距對(duì)圍巖及初支結(jié)構(gòu)最終的累計(jì)變形及受力影響較小。但是,圍巖及初支結(jié)構(gòu)在變形過程中受到的影響較大,當(dāng)左右線施工間距為5m時(shí),隧道變形過程有波動(dòng),這是由于左右洞之間的相互影響導(dǎo)致。隨著左右線施工間距的增大,如間距為15m和25m時(shí),隧道關(guān)鍵點(diǎn)變形曲線未出現(xiàn)波動(dòng),左右洞之間的相互影響很小。(4)通過對(duì)比數(shù)值模擬結(jié)果與現(xiàn)場(chǎng)監(jiān)控量測(cè)數(shù)據(jù),隧道變形趨勢(shì)近似,論證了數(shù)值模擬研究的正確性。在推薦的大化路隧道設(shè)計(jì)及施工方法下,隧道超前洞和后續(xù)洞的拱頂沉降、水平收斂,累計(jì)變形量均未超過規(guī)范規(guī)定的允許變形量,大化路隧道設(shè)計(jì)及施工方案可行。(5)通過以上研究結(jié)論,對(duì)重慶市渝中區(qū)大化路螺旋隧道的設(shè)計(jì)施工具體指導(dǎo)意義。
[Abstract]:The tunnel construction is restricted by topography, geology and so on. When the height difference between the control points can not be overcome by the natural extension or the long tunnel, the spiral tunnel has better linear conditions and the potential to meet the linear index. More and more attention has been paid to the spiral tunnel, but the application of spiral tunnel is relatively few, which needs further study. Based on the engineering background of Dahua Road Spiral Tunnel in Yuzhong District of Chongqing City, this paper adopts finite element method to study the linear curvature of spiral tunnel. The excavation method, the distance between the right and left faces, the construction monitoring and so on are studied in detail. The main research contents and conclusions are as follows: (1) the optimum curve radius of spiral tunnel is determined. With the decrease of linear radius, the spiral tunnel shows the following laws: the stress of surrounding rock is getting worse and worse, the plastic zone of surrounding rock increases from zero to having, the area of plastic zone increases continuously; The asymmetric deformation of tunnel lining is becoming more and more obvious, and the initial branch system is subjected to more and more stress. When the tunnel must be in the form of spiral tunnel under limited conditions, it is suggested that a larger linear radius should be chosen as far as possible in combination with topographic conditions. The reasonable excavation method is determined by making the line shape relatively smooth. Through the analysis of the stress and deformation of the spiral tunnel under the three methods of full section method, step method and CD method, the deformation of the surrounding rock and the initial branch structure is approximate under the three kinds of engineering methods during the excavation. There is no plastic zone in all of them, in which the deformation of surrounding rock and primary branch structure under CD method is slightly smaller, which reflects the ability to control the deformation of surrounding rock, and from the stress situation of initial support structure, it is concluded that the order of three kinds of engineering methods is CD method, step method, and so on. Full section method. Considering the asymmetry of spiral tunnel force, the construction method with gentle deformation should be chosen so as to avoid the appearance of rapid deformation. In order to avoid the instability of surrounding rock, the safe distance of excavation surface is determined. The distance between left and right lines has little effect on the accumulative deformation and force of surrounding rock and initial support structure. However, The surrounding rock and the initial support structure are affected greatly in the deformation process. When the construction distance of the left and right lines is 5 m, the tunnel deformation process fluctuates, which is caused by the mutual influence between the left and right tunnels. With the increase of the construction distance between the left and right lines, For example, when the spacing is 15m and 25m, the deformation curve of the key points of the tunnel does not fluctuate, and the interaction between the left and right tunnels is very small. The correctness of numerical simulation study is demonstrated. Under the recommended design and construction method of Dahua Road Tunnel, the settlement of the arch roof of the leading tunnel and the subsequent tunnel is horizontal convergent, and the cumulative deformation amount is not more than the allowable deformation amount stipulated in the code. The design and construction scheme of Dahua Road Tunnel is feasible. Through the above conclusions, it is of guiding significance to the design and construction of Dahua Road Spiral Tunnel in Yuzhong District of Chongqing City.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U455.4

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