本文關(guān)鍵詞：隧道緊急停車(chē)帶施工工法計(jì)算機(jī)模擬分析及變形預(yù)測(cè)研究　出處：《西安科技大學(xué)》2015年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 隧道緊急停車(chē)帶 施工工法 計(jì)算機(jī)模擬 單元生死 灰色預(yù)測(cè)

【摘要】：當(dāng)前我國(guó)大規(guī)模的隧道建設(shè)中,軟弱圍巖隧道緊急停車(chē)帶由于斷面大,圍巖性質(zhì)差,在其設(shè)計(jì)與施工過(guò)程中存在許多難題,通常表現(xiàn)為圍巖變形大,甚至發(fā)生坍塌等安全事故,主要原因在于隧道圍巖特別是軟弱圍巖的變形機(jī)制、發(fā)展演化規(guī)律等認(rèn)識(shí)不足,采取的控制技術(shù)與方法缺乏針對(duì)性等。因此,本文綜合運(yùn)用理論分析、數(shù)值模擬和現(xiàn)場(chǎng)實(shí)測(cè)等方法,結(jié)合秦嶺Ⅰ號(hào)隧道工程實(shí)例,對(duì)隧道緊急停車(chē)帶的施工工法和圍巖變形的預(yù)測(cè)進(jìn)行系統(tǒng)研究,取得了具有一定價(jià)值的研究成果,主要有:通過(guò)對(duì)ANSYS軟件在隧道工程中應(yīng)用現(xiàn)狀的分析,深入研究ANSYS分析隧道開(kāi)挖過(guò)程中單元生死功能的注意事項(xiàng)以及實(shí)現(xiàn)方法,并結(jié)合秦嶺Ⅰ號(hào)高速公路隧道,針對(duì)該隧道緊急停車(chē)帶跨度大、斷面面積大、圍巖類(lèi)別低的特點(diǎn),利用計(jì)算機(jī)技術(shù)編制一定程序優(yōu)化了單元的“殺死”和“激活”功能,分別對(duì)雙側(cè)壁導(dǎo)坑法和三臺(tái)階法情況下的圍巖變形進(jìn)行數(shù)值模擬,得出隧道在兩種工法下的圍巖應(yīng)力重新分布情況,使得巖體開(kāi)挖和襯砌施加的模擬分析更加符合工程實(shí)際,對(duì)類(lèi)似工程具有一定的指導(dǎo)和借鑒意義。其次,通過(guò)對(duì)秦嶺Ⅰ號(hào)隧道緊急停車(chē)帶Ⅱ級(jí)圍巖段施工工法的優(yōu)化分析,應(yīng)用改進(jìn)的計(jì)算方法可方便計(jì)算出兩種施工工法隧道圍巖受力和變形情況,計(jì)算結(jié)果表明,三臺(tái)階法在圍巖的受力和變形方面要優(yōu)于雙側(cè)壁導(dǎo)坑法,并能較好地避免局部塌方事故的發(fā)生。而從工程造價(jià)和施工工期方面考慮,三臺(tái)階法要比雙側(cè)壁導(dǎo)坑法更具優(yōu)越性,最終確定三臺(tái)階法作為秦嶺Ⅰ號(hào)隧道緊急停車(chē)帶的施工方法。最后,將灰色理論的預(yù)測(cè)模型應(yīng)用于隧道圍巖變形的預(yù)測(cè)中,并針對(duì)非等時(shí)距GM(1,1)模型預(yù)測(cè)模型,編制相應(yīng)的MATLAB計(jì)算程序,實(shí)現(xiàn)了非等間距預(yù)測(cè),提高了短期預(yù)測(cè)結(jié)果的準(zhǔn)確性。通過(guò)對(duì)比分析,認(rèn)為新陳代謝模型在長(zhǎng)期預(yù)測(cè)方面較其他兩種模型更加接近圍巖變形發(fā)展規(guī)律,可作為秦嶺Ⅰ號(hào)隧道緊急停車(chē)帶圍巖變形預(yù)測(cè)模型。
[Abstract]:At present, in the large-scale tunnel construction in our country, there are many difficulties in the design and construction of the emergency parking zone of the soft surrounding rock tunnel due to its large section and poor surrounding rock properties, which is usually manifested in the large deformation of the surrounding rock. Even collapse and other safety accidents, mainly due to the tunnel surrounding rock, especially the weak surrounding rock deformation mechanism, development and evolution of the lack of understanding of the law, adopted control techniques and methods are lack of pertinence and so on. This paper makes a systematic study on the construction method of the tunnel emergency stop zone and the prediction of the surrounding rock deformation by using the methods of theoretical analysis, numerical simulation and field measurement, combined with the example of Qinling No. 1 tunnel project. Some valuable research results have been obtained, including: through the analysis of the application status of ANSYS software in tunnel engineering. In this paper, the attention and realization method of unit life and death function in tunnel excavation are analyzed by ANSYS. Combined with Qinling No. 1 Expressway Tunnel, the emergency parking belt span and cross-section area of this tunnel are large. Because of the low class of surrounding rock, the functions of "killing" and "activating" of the unit are optimized by computer program, and the deformation of surrounding rock is simulated under the condition of double-side wall pit method and three-step method respectively. It is concluded that the stress redistribution of surrounding rock under the two engineering methods makes the simulation analysis of rock excavation and lining more in line with the engineering practice and has a certain guidance and reference significance for similar projects. Secondly. Through the optimization analysis of the construction method of the second grade surrounding rock section of the emergency parking zone of Qinling 鈪，

本文編號(hào)：1432072