软弱围岩隧道掌子面稳定性判别及变形控制技术

发布时间：2018-03-25 01:02

本文选题：软岩　切入点：掌子面失稳　出处：《石家庄铁道大学》2014年硕士论文

【摘要】：近年来，随着我国高速铁路技术的不断发展，为了克服客运专线上高速列车在隧道内运行所引起的空气动力学问题，大断面隧道日益增多。对于软弱围岩，由于地层条件较差，这就对隧道掌子面自身的稳定提出了更高要求，而且掌子面的稳定与否在施工中对整个隧道的稳定也会产生重要影响。目前，关于掌子面的变形特征、稳定性判别等方面的研究尚处于探索阶段，相应的研究成果系统性、适用性不强，与实际要求上存在一定差距。本文首先在参考前人研究成果后，重点分析掌子面挤出变形发生发展规律，掌子面前方围岩空间效应区内的位移、应力的分布规律，并总结掌子面挤出变形的主要影响因素。在围岩开挖卸载力学效应研究的基础上，利用大型有限元软件ANSYS，，采用平面地应力逐级释放法，分析掌子面挤出位移与地应力释放率的关系，运用近代数学中的突变理论，找出掌子面挤出位移发生突变时刻对应的地应力释放率，进而得到掌子面失稳位移。提出了掌子面稳定性控制理念和理论基础，系统总结了软弱围岩隧道掌子面稳定控制技术及方法，分析了其控制原理，阐述了其主要的工艺方法、使用的材料、机械设备、适合的地质条件等。
[Abstract]:In recent years, with the continuous development of high-speed railway technology in China, in order to overcome the aerodynamic problems caused by high-speed trains running in tunnels on passenger dedicated lines, large section tunnels are increasing day by day. This puts forward higher requirements for the stability of the tunnel face itself, and whether the face of the tunnel is stable or not will also have an important impact on the stability of the whole tunnel during the construction. At present, about the deformation characteristics of the face of the tunnel, The research on stability discrimination is still in the exploratory stage, the corresponding research results are systematic, and the applicability is not strong, and there is a certain gap between the research results and the actual requirements. In this paper, after referring to the previous research results, this paper focuses on the analysis of the development law of extrusion deformation, displacement and stress distribution of surrounding rock in front of the face, and summarizes the main factors that affect the extrusion deformation of palm face. On the basis of the study on the mechanical effect of excavation and unloading of surrounding rock, using the large-scale finite element software ANSYSand using the plane in-situ stress step by step release method, the relationship between the extrusion displacement and the in-situ stress release rate is analyzed, and the catastrophe theory in modern mathematics is applied. The in-situ stress release rate corresponding to the sudden change in the extrusion displacement of the face of the palm is found, and then the unstable displacement of the face of the palm is obtained. This paper puts forward the concept and theoretical basis of the stability control of the face of the palm, summarizes systematically the technology and method of the stability control of the face of the tunnel with soft surrounding rock, analyzes its control principle, expounds its main technological methods, the materials used, and the machinery and equipment. Suitable geological conditions, etc.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U451.2

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