隧道紧急停车带施工工法计算机模拟分析及变形预测研究

发布时间：2018-01-16 07:15

  本文关键词：隧道紧急停车带施工工法计算机模拟分析及变形预测研究　出处：《西安科技大学》2015年硕士论文　论文类型：学位论文

  更多相关文章： 隧道紧急停车带 施工工法 计算机模拟 单元生死 灰色预测

【摘要】：当前我国大规模的隧道建设中,软弱围岩隧道紧急停车带由于断面大,围岩性质差,在其设计与施工过程中存在许多难题,通常表现为围岩变形大,甚至发生坍塌等安全事故,主要原因在于隧道围岩特别是软弱围岩的变形机制、发展演化规律等认识不足,采取的控制技术与方法缺乏针对性等。因此,本文综合运用理论分析、数值模拟和现场实测等方法,结合秦岭Ⅰ号隧道工程实例,对隧道紧急停车带的施工工法和围岩变形的预测进行系统研究,取得了具有一定价值的研究成果,主要有:通过对ANSYS软件在隧道工程中应用现状的分析,深入研究ANSYS分析隧道开挖过程中单元生死功能的注意事项以及实现方法,并结合秦岭Ⅰ号高速公路隧道,针对该隧道紧急停车带跨度大、断面面积大、围岩类别低的特点,利用计算机技术编制一定程序优化了单元的“杀死”和“激活”功能,分别对双侧壁导坑法和三台阶法情况下的围岩变形进行数值模拟,得出隧道在两种工法下的围岩应力重新分布情况,使得岩体开挖和衬砌施加的模拟分析更加符合工程实际,对类似工程具有一定的指导和借鉴意义。其次,通过对秦岭Ⅰ号隧道紧急停车带Ⅱ级围岩段施工工法的优化分析,应用改进的计算方法可方便计算出两种施工工法隧道围岩受力和变形情况,计算结果表明,三台阶法在围岩的受力和变形方面要优于双侧壁导坑法,并能较好地避免局部塌方事故的发生。而从工程造价和施工工期方面考虑,三台阶法要比双侧壁导坑法更具优越性,最终确定三台阶法作为秦岭Ⅰ号隧道紧急停车带的施工方法。最后,将灰色理论的预测模型应用于隧道围岩变形的预测中,并针对非等时距GM(1,1)模型预测模型,编制相应的MATLAB计算程序,实现了非等间距预测,提高了短期预测结果的准确性。通过对比分析,认为新陈代谢模型在长期预测方面较其他两种模型更加接近围岩变形发展规律,可作为秦岭Ⅰ号隧道紧急停车带围岩变形预测模型。
[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，

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