本文選題：三車道隧道　切入點(diǎn)：數(shù)值模擬　出處：《蘭州交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：近年來(lái)我國(guó)交通事業(yè)迅猛發(fā)展，大斷面隧道如雨后春筍般迅速增長(zhǎng)，相對(duì)應(yīng)的施工問(wèn)題也越來(lái)越多，，如何選擇最優(yōu)的施工方法是我們當(dāng)前面臨的首要問(wèn)題，技術(shù)的進(jìn)步是保證施工安全、優(yōu)化設(shè)計(jì)、降低工程成本的關(guān)鍵因素。 蘭州市九州隧道是處于片麻巖地段的三車道公路隧道，最大開(kāi)挖跨度15.83m,最大開(kāi)挖高度10.57m。本文結(jié)合九州隧道工程，對(duì)大斷面公路隧道的施工方法做進(jìn)一步的研究。 研究?jī)?nèi)容與方法： (1)以隧道圍巖變形及支護(hù)結(jié)構(gòu)力學(xué)監(jiān)測(cè)為基礎(chǔ)，采用非線性擬合方法分析九州隧道工程變化規(guī)律，并通過(guò)繪制應(yīng)力及位移時(shí)程曲線，得出隧道支護(hù)結(jié)構(gòu)受力的變化規(guī)律。 (2)以甘肅省蘭州市九州隧道為背景，建立力學(xué)計(jì)算模型，采用midas GTS進(jìn)行數(shù)值模擬，將計(jì)算結(jié)果（拱頂?shù)某两�、凈空水平位移、圍巖與襯砌的受力及圍巖與襯砌的內(nèi)力和變形）與施工過(guò)程的實(shí)際監(jiān)測(cè)數(shù)據(jù)進(jìn)行分析對(duì)比，驗(yàn)證數(shù)值模擬的科學(xué)性，為隧道施工時(shí)的安全提供重要的技術(shù)支撐和理論保障，并為隧道設(shè)計(jì)階段參數(shù)的優(yōu)化提供了可靠的技術(shù)支撐。 (3)模擬不同的開(kāi)挖方法：兩臺(tái)階五步開(kāi)挖、三臺(tái)階七步開(kāi)挖、上臺(tái)階CD法，分析各開(kāi)挖方法圍巖及支護(hù)結(jié)構(gòu)的變形與應(yīng)力，結(jié)合各不同開(kāi)挖方法的實(shí)際成本進(jìn)行對(duì)比分析，利用價(jià)值工程原理優(yōu)選開(kāi)挖方法。 研究成果： (1)實(shí)測(cè)分析得到采用三臺(tái)階七步開(kāi)挖破碎片麻巖隧道隨時(shí)間變化規(guī)律：觀測(cè)斷面周邊關(guān)鍵點(diǎn)位置的位移、圍巖的壓力、鋼拱架的應(yīng)力、錨桿軸力以及襯砌應(yīng)力等均出現(xiàn)了嚴(yán)重的不對(duì)稱現(xiàn)場(chǎng)，主要是由于該斷面埋深較淺，受到左線刷坡施工的影響較大。 (2)通過(guò)三維模擬對(duì)比分析，對(duì)于破碎片麻巖隧道，采用上臺(tái)階CD法可以減小圍巖及支護(hù)結(jié)構(gòu)的變形及受力，最大沉降發(fā)生在拱頂處，為1.02cm，鋼拱架的最大應(yīng)力發(fā)生在右拱肩處，為-72.6MPa；噴混凝土的最大壓應(yīng)力發(fā)生在左拱腰處，為-12.0MPa；右最大跨部位出現(xiàn)圍巖壓力最大值，其值為319.6KPa。 (3)兩臺(tái)階五步開(kāi)挖的成本為6407.7元/米、三臺(tái)階七步開(kāi)挖的成本為7821.7元/米、上臺(tái)階CD法的成本為9012元/米；兩臺(tái)階要比三臺(tái)階節(jié)省1414元/米，比上臺(tái)階CD法節(jié)省2604.3元/米，九州隧道右線全長(zhǎng)2768，兩臺(tái)階比三臺(tái)階節(jié)省391萬(wàn)，比CD節(jié)省721萬(wàn) (4)通過(guò)分析比選，采用上臺(tái)階CD法可以有效控制圍巖及支護(hù)結(jié)構(gòu)的受力和變形；采用兩臺(tái)階五步開(kāi)挖，可以節(jié)約資金，降低工程成本。
[Abstract]:In recent years, with the rapid development of transportation in our country, the large section tunnel is growing rapidly, and the corresponding construction problems are more and more. How to choose the best construction method is the most important problem that we are facing at present. The progress of technology is the key factor to ensure construction safety, optimize design and reduce project cost. The Jiuzhou Tunnel in Lanzhou City is a three-lane highway tunnel in gneiss area with a maximum excavation span of 15.83 m and a maximum excavation height of 10.57 m. This paper makes further research on the construction method of large-section highway tunnel combined with Jiuzhou Tunnel Project. Research contents and methods:. 1) based on the monitoring of surrounding rock deformation and supporting structure mechanics, the nonlinear fitting method is used to analyze the variation law of Jiuzhou tunnel project, and by drawing the time history curve of stress and displacement, the variation law of tunnel supporting structure is obtained. Taking the Jiuzhou Tunnel of Lanzhou City, Gansu Province as the background, the mechanical calculation model is established, and the numerical simulation is carried out by midas GTS. The calculated results (the settlement of the vault, the horizontal displacement of the clearance, and the horizontal displacement of the vault) are calculated. The stress of surrounding rock and lining and the internal force and deformation of surrounding rock and lining) are analyzed and compared with the actual monitoring data of construction process, which verifies the scientific nature of numerical simulation and provides important technical support and theoretical guarantee for the safety of tunnel construction. It also provides reliable technical support for the optimization of tunnel design parameters. 3) simulating different excavation methods: two steps five steps excavation, three steps seven steps excavation, up step CD method, analyzing the deformation and stress of surrounding rock and supporting structure of each excavation method, and comparing and analyzing the actual cost of different excavation methods. Using the principle of value engineering, the optimal excavation method is selected. Research findings:. 1) the measured results show that three steps and seven steps are used to excavate broken gneiss tunnel with time: displacement of key points around observation section, pressure of surrounding rock, stress of steel arch frame, The axial force of anchor rod and the stress of lining appear serious asymmetry field, mainly because of the shallow buried depth of the section, which is greatly affected by the construction of the left line brushing slope. (2) through 3D simulation and contrast analysis, for broken gneiss tunnel, the deformation and force of surrounding rock and supporting structure can be reduced by using upper step CD method. The maximum settlement occurs at the arch top (1.02cm), and the maximum stress of steel arch frame occurs at the right arch shoulder. The maximum compressive stress of shotcrete occurs at the left arch, which is -12.0MPa, and the maximum pressure of surrounding rock appears in the right maximum span with a value of 319.6KPa. The cost of two-step five-step excavation is 6407.7 yuan / m, the cost of three-step seven-step excavation is 7821.7 yuan / m, the cost of upper step CD method is 9012 yuan / m, the cost of two steps is 1414 yuan / m less than that of three steps, and 2604.3 yuan / m compared with the upper step CD method. The full length of the right line of Jiuzhou tunnel is 2768. The two steps save 3.91 million compared with three steps, and the saving of CD 7.21 million. 4) by analyzing and selecting, using the method of upper step CD can effectively control the stress and deformation of surrounding rock and supporting structure, and adopting two-step five-step excavation can save money and reduce the project cost.
【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】：2014
【分類號(hào)】：U455.4

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