發(fā)布時間：2018-01-16 07:15

  本文關鍵詞：隧道緊急停車帶施工工法計算機模擬分析及變形預測研究　出處：《西安科技大學》2015年碩士論文　論文類型：學位論文

  更多相關文章： 隧道緊急停車帶 施工工法 計算機模擬 單元生死 灰色預測

【摘要】：當前我國大規(guī)模的隧道建設中,軟弱圍巖隧道緊急停車帶由于斷面大,圍巖性質(zhì)差,在其設計與施工過程中存在許多難題,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制、發(fā)展演化規(guī)律等認識不足,采取的控制技術與方法缺乏針對性等。因此,本文綜合運用理論分析、數(shù)值模擬和現(xiàn)場實測等方法,結(jié)合秦嶺Ⅰ號隧道工程實例,對隧道緊急停車帶的施工工法和圍巖變形的預測進行系統(tǒng)研究,取得了具有一定價值的研究成果,主要有:通過對ANSYS軟件在隧道工程中應用現(xiàn)狀的分析,深入研究ANSYS分析隧道開挖過程中單元生死功能的注意事項以及實現(xiàn)方法,并結(jié)合秦嶺Ⅰ號高速公路隧道,針對該隧道緊急停車帶跨度大、斷面面積大、圍巖類別低的特點,利用計算機技術編制一定程序優(yōu)化了單元的“殺死”和“激活”功能,分別對雙側(cè)壁導坑法和三臺階法情況下的圍巖變形進行數(shù)值模擬,得出隧道在兩種工法下的圍巖應力重新分布情況,使得巖體開挖和襯砌施加的模擬分析更加符合工程實際,對類似工程具有一定的指導和借鑒意義。其次,通過對秦嶺Ⅰ號隧道緊急停車帶Ⅱ級圍巖段施工工法的優(yōu)化分析,應用改進的計算方法可方便計算出兩種施工工法隧道圍巖受力和變形情況,計算結(jié)果表明,三臺階法在圍巖的受力和變形方面要優(yōu)于雙側(cè)壁導坑法,并能較好地避免局部塌方事故的發(fā)生。而從工程造價和施工工期方面考慮,三臺階法要比雙側(cè)壁導坑法更具優(yōu)越性,最終確定三臺階法作為秦嶺Ⅰ號隧道緊急停車帶的施工方法。最后,將灰色理論的預測模型應用于隧道圍巖變形的預測中,并針對非等時距GM(1,1)模型預測模型,編制相應的MATLAB計算程序,實現(xiàn)了非等間距預測,提高了短期預測結(jié)果的準確性。通過對比分析,認為新陳代謝模型在長期預測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號隧道緊急停車帶圍巖變形預測模型。
[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：1432072