本文選題：隧道工程 + 結(jié)構(gòu)變形��； 參考：《昆明理工大學(xué)》2014年碩士論文

【摘要】：隨著以公路建設(shè)為主的基礎(chǔ)設(shè)施建設(shè)在我國的空前發(fā)展,西部地區(qū)山嶺公路隧道工程數(shù)量不斷增長,建設(shè)速度不斷加快,但因地質(zhì)條件及施工等原因,國內(nèi)己建或在建的大部分公路隧道都存在不同程度的隧道病害問題。因此,在隧道施工及運營過程中對圍巖與支護(hù)結(jié)構(gòu)的受力狀態(tài)進(jìn)行分析與監(jiān)測,對隧道可能出現(xiàn)病害的位置準(zhǔn)確預(yù)警,在保證隧道結(jié)構(gòu)安全及工程質(zhì)量方面具有重要的作用。 本文以云南省田心隧道為研究對象,為確保其施工及運營安全,對圍巖與支護(hù)結(jié)構(gòu)受力狀態(tài)進(jìn)行了有限元數(shù)值模擬與現(xiàn)場監(jiān)測對比研究。主要包括以下幾方面的工作： 1.研究分析了隧道施工數(shù)值模擬理論及其在ANSYS中的實現(xiàn)。根據(jù)田心隧道工程概況,利用有限元法建立其平面應(yīng)變計算模型,并采用施加虛擬支撐力逐步釋放法與單元生死技術(shù)模擬臺階法施工過程。 2.分析有限元數(shù)值模擬所得圍巖位移場、圍巖應(yīng)力場與二次襯砌內(nèi)力,得出隧道結(jié)構(gòu)變形與受力規(guī)律。 3.根據(jù)有限元數(shù)值模擬結(jié)果,確定了光纖光柵監(jiān)測方案,利用FBG傳感器建立了由二次襯砌應(yīng)變監(jiān)測子系統(tǒng)與圍巖壓力監(jiān)測子系統(tǒng)組成的光纖Bragg光柵傳感網(wǎng),對隧道健康狀態(tài)進(jìn)行長期監(jiān)測。 4.監(jiān)測數(shù)據(jù)與模擬結(jié)果對比表明,除拱頂二次襯砌應(yīng)變外,其余位置二次襯砌應(yīng)變及圍巖壓力監(jiān)測值與數(shù)值模擬所得隧道受力狀態(tài)基本一致,應(yīng)變監(jiān)測值約為模擬值的60%～70%,圍巖壓力監(jiān)測值與模擬值吻合；拱頂應(yīng)變監(jiān)測值(309.83με～327.23με)大于應(yīng)變模擬值(209.37με),與現(xiàn)場拱頂部位開裂現(xiàn)象一致,是長期監(jiān)控的重點。 5.將數(shù)值模擬與現(xiàn)場監(jiān)測相結(jié)合的分析方法應(yīng)用于隧道工程可準(zhǔn)確預(yù)警隧道病害位置,克服了單一現(xiàn)場監(jiān)測方法存在的預(yù)見性較弱等缺陷,充分說明該方法在確保隧道施工及運營安全方面是行之有效的。
[Abstract]:With the unprecedented development of the infrastructure construction based on highway construction in China, the number of mountain highway tunnel projects in the western region is increasing and the construction speed is speeding up, but due to geological conditions and construction and other reasons, Most highway tunnels built or under construction in China have different degree of tunnel disease. Therefore, in the course of tunnel construction and operation, the stress state of surrounding rock and supporting structure is analyzed and monitored, and the location of possible tunnel diseases is accurately forewarned, which plays an important role in ensuring the safety of tunnel structure and engineering quality. In order to ensure the safety of construction and operation of Tianxin Tunnel in Yunnan Province, the finite element numerical simulation and field monitoring of surrounding rock and supporting structure are carried out in this paper. This includes the following areas of work: 1. The numerical simulation theory of tunnel construction and its realization in ANSYS are studied and analyzed. According to the general situation of Tianxin tunnel project, the plane strain calculation model is established by using finite element method, and the step method construction process is simulated by applying virtual supporting force step by step release method and element birth and death technique. 2. The displacement field, stress field of surrounding rock and internal force of secondary lining are obtained by finite element numerical simulation, and the deformation and force law of tunnel structure are obtained. 3. According to the results of finite element numerical simulation, the fiber Bragg grating (FBG) monitoring scheme is determined. The fiber Bragg grating sensing network is established by using the FBG sensor, which consists of the secondary lining strain monitoring subsystem and the surrounding rock pressure monitoring subsystem. Long-term monitoring of tunnel health status was carried out. 4. The comparison between the monitoring data and the simulation results shows that the monitoring values of the secondary lining strain and surrounding rock pressure at the other locations, except for the secondary lining strain of the arch roof, are basically consistent with the numerical simulation results. The strain monitoring value is about 60 / 70 of the simulated value, the monitoring value of surrounding rock pressure is in agreement with the simulated value, and the strain monitoring value of arch roof is 309.83 渭 蔚 ~ 327.23 渭 蔚), which is larger than the strain simulation value of 209.37 渭 蔚, which is consistent with the cracking phenomenon at the site of the vault, and is the focus of long-term monitoring. 5. The method of numerical simulation combined with field monitoring is applied to the tunnel engineering to accurately warn the location of tunnel disease, which overcomes the shortcomings of the single field monitoring method such as weak predictability, etc. It is fully explained that the method is effective in ensuring the safety of tunnel construction and operation.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U456.3

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