【摘要】：本文針對(duì)工程中常遇到的空間交叉隧道施工穩(wěn)定性問題,研究和總結(jié)近接隧道施工基本應(yīng)力場(chǎng)理論、圍巖破壞機(jī)理及分類標(biāo)準(zhǔn)、影響程度判斷準(zhǔn)則及分區(qū)標(biāo)準(zhǔn)等基本理論。運(yùn)用ABAQUS有限元軟件,模擬分析從化至東莞高速公路左右雙線隧道開挖施工對(duì)下方已有的空間交叉東深供水隧洞產(chǎn)生的穩(wěn)定性影響。具體包括以下幾個(gè)方面研究?jī)?nèi)容:(1)通過對(duì)工程所處區(qū)域地質(zhì)概況的調(diào)研以及隧洞交叉段的工程地質(zhì)條件總結(jié),進(jìn)行圍巖穩(wěn)定性評(píng)價(jià),對(duì)圍巖進(jìn)行分類,確定了隧洞及圍巖的物理力學(xué)參數(shù)建議值。(2)針對(duì)工程實(shí)際情況,建立ABAQUS三維有限元模型,運(yùn)用對(duì)公路隧道不同類別的圍巖參數(shù)分別進(jìn)行隧道開挖模擬,得出不同參數(shù)對(duì)圍巖及交叉段供水隧洞襯砌的應(yīng)力計(jì)算結(jié)果的影響規(guī)律。(3)分別模擬右線和左線公路隧道開挖過程,得出開挖引起的圍巖變形和應(yīng)力值大小,得出了交叉段供水隧洞襯砌因開挖產(chǎn)生的附加拉應(yīng)力及附加壓應(yīng)力的分布規(guī)律,確定了最大附加拉、壓應(yīng)力值及作用位置。(4)計(jì)算得出了開挖結(jié)束后,交叉段供水隧洞圍巖及襯砌最終的變形大小,以及最大拉應(yīng)力和最大壓應(yīng)力的大小及作用位置,并將最大拉、壓應(yīng)力結(jié)果與供水隧洞襯砌的抗拉、抗壓強(qiáng)度對(duì)比,判斷其穩(wěn)定性為安全。(5)考慮分步開挖,將隧道按開挖一段、立即襯砌一段的實(shí)際開挖過程進(jìn)行了有限元模擬,得出分步開挖后圍巖及交叉段供水隧洞變形及應(yīng)力結(jié)果,選取供水隧洞典型斷面及主要特征點(diǎn),得出了各點(diǎn)應(yīng)力和變形隨開挖步驟的變化曲線,總結(jié)出了各點(diǎn)的應(yīng)力及變形變化規(guī)律。(6)根據(jù)有限元數(shù)值分析和公式計(jì)算結(jié)果,對(duì)輸水隧洞得出結(jié)構(gòu)分析結(jié)論和安全評(píng)價(jià),并給出具體建議。
[Abstract]:In this paper, the basic stress field theory, failure mechanism and classification standard of surrounding rock, criterion of influence degree and zoning standard are studied and summarized in view of the stability of space crossing tunnel construction which is often encountered in engineering. By using ABAQUS finite element software, this paper simulates and analyzes the influence of the excavation of the left and right double-line tunnel of Conghua to Dongguan expressway on the stability of the existing space crossing Dongshen water supply tunnel. The specific research contents include the following aspects: (1) through the investigation of the regional geological situation of the project and the summary of the engineering geological conditions of the tunnel crossing section, the stability of surrounding rock is evaluated and the surrounding rock is classified. The suggested values of the physical and mechanical parameters of the tunnel and surrounding rock are determined. (2) according to the actual situation of the project, the three-dimensional finite element model of ABAQUS is established, and the tunnel excavation simulation is carried out by using different kinds of surrounding rock parameters of the highway tunnel. The influence of different parameters on the stress calculation results of surrounding rock and cross section water supply tunnel lining is obtained. (3) the excavation process of right and left highway tunnel is simulated, and the deformation and stress value of surrounding rock caused by excavation are obtained. The distribution law of additional tensile stress and additional compressive stress caused by excavation for the lining of cross section water supply tunnel is obtained, and the maximum additional tensile stress and compressive stress value and action position are determined. (4) after the excavation is finished, the distribution of additional tensile stress and additional compressive stress is obtained. The final deformation of the surrounding rock and lining of the cross section water supply tunnel, and the magnitude and position of the maximum tensile stress and the maximum compressive stress are compared with the tensile and compressive strength of the lining of the water supply tunnel. The stability of the tunnel is judged to be safe. (5) considering the step excavation, the actual excavation process of the tunnel is simulated by finite element method, and the deformation and stress results of the surrounding rock and the water supply tunnel in the cross section after the step excavation are obtained. By selecting typical section and main characteristic points of water supply tunnel, the variation curves of stress and deformation of each point with excavation steps are obtained, and the variation law of stress and deformation at each point is summarized. (6) according to the results of finite element numerical analysis and formula calculation, The conclusion of structure analysis and safety evaluation of water conveyance tunnel are obtained, and some concrete suggestions are given.
【學(xué)位授予單位】：西北農(nóng)林科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U455

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本文編號(hào)：2172920