本文選題：隧道　切入點：開挖尺寸　出處：《重慶交通大學》2015年碩士論文

【摘要】：隨著我國經濟的迅速發(fā)展,公路隧道工程越來越多,隧道的形式、地質、水文、環(huán)境等條件的復雜多變,出現(xiàn)了風險事故更加多樣,安全問題越發(fā)突出的情況,同時,在隧道的開挖施工及支護問題上,雖然依照新奧法,但施工過程中開挖的尺寸、支護的措施存在著不合理、不安全、不經濟等問題。合理的施工開挖尺寸的確定和支護手段的優(yōu)化是目前隧道工程施工急需研究的一個方面。本文以兩車道四級圍巖的公路隧道為研究對象,運用ANSYS有限元軟件來模擬分析,計算出不同施工設計參數(shù)時的應力位移變化,分析圍巖軸力彎矩、彈性抗力區(qū)、脫離區(qū)、應力應變關系等,對隧道開挖設計參數(shù)不同時的穩(wěn)定性以及確定開挖尺寸時的有效支護問題進行了研究分析。主要工作如下：①運用彈塑性理論,研究分析了隧道初始地應力狀態(tài)、開挖后的受力狀態(tài)以及支護后的內力變化規(guī)律,對模型建立的幾個影響因素進行了總結分析,確立了數(shù)值模擬參數(shù)的選��；②通過對隧道的開挖模擬,分析結構的應力位移變化情況,確定不同開挖尺寸時的結構穩(wěn)定性系數(shù),進而來確定一種合理的開挖尺寸設計；③運用ANSYS有限元分析軟件,對工程施工進行精確適用的數(shù)值模擬分析,采用D-P理論,分析臺階法開挖時,不同的上臺階開挖高度情況下的結構穩(wěn)定性及應力應變位移,通過對隧道抗力區(qū)、脫離區(qū)的分析,優(yōu)化比選出較為合理的開挖設計；④對上臺階開挖高度為4m的開挖方案進行分析,根據圍巖壓力狀態(tài)和抗力區(qū)、脫離區(qū)范圍,對脫離區(qū)進行局部支護,施加一個支護抗力,通過改變支護抗力、泊松比、彈性模量的大小,計算不同情況下的安全系數(shù),對圍巖的支護要求進行合理的區(qū)間分析,得出較為安全的支護設計,改善圍巖的應力情況。為隧道施工提供更好的設計依據和技術支持,保證工程的安全順利進行。
[Abstract]:With the rapid development of China's economy, more and more highway tunnel engineering, tunnel, geological, hydrological, environmental and other conditions of the complex, the risk of accidents is more diverse, security issues become more prominent, at the same time, in the tunnel excavation and support issues, although in accordance with the new Austrian law, but in the process of excavation size, supporting measures are not reasonable, safe, economic and other issues. The excavation and support method for determining the size of the optimization is a research on construction of tunnel engineering. At present the urgent need to the two lane highway tunnel four grade rock as the research object. Simulation analysis using the finite element software ANSYS to calculate the design parameters for different construction stress analysis of surrounding rock displacement variation, axial force moment, elastic resistance zone, from the region, relation between stress and strain, and the design parameters of tunnel excavation Analyzed the stability and effective support to determine the size of the excavation supporting problem. The main work is as follows: the use of elastic-plastic theory, research and analysis of the initial stress state after the excavation of tunnel, the stress state and supporting internal force change rules and influence factors of the model are analyzed, the establishment of the parameters of numerical simulation; through the simulation on the tunnel excavation, analysis of structure change of stress and displacement, determine the structure stability coefficient of different excavation size, and to determine a reasonable excavation size design; the use of ANSYS finite element analysis software, numerical simulation and analysis of precision for engineering construction using D-P theory, analysis, bench excavation, different step excavation height and structure stability under the condition of stress strain and displacement, through the tunnel resistance area, detachment The analysis of excavation design optimization is selected more reasonable; the step excavation height of excavation scheme of 4m were analyzed, according to the state of surrounding rock pressure and resistance area, out of range, from local area to support, applying a supporting force, by changing the supporting force, Poisson ratio, elastic modulus size, calculation of safety coefficient under different conditions were analyzed, the reasonable range of surrounding rock support requirements, the safe support design, improve the surrounding rock stress. Provide better design basis and technical support for tunnel construction, to ensure the safety of the project smoothly.

【學位授予單位】：重慶交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U455

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本文編號：1655560