双联拱和小净距隧道施工技术研究

发布时间：2018-04-12 09:21

本文选题：双联拱 + 小净距　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：本文搜集了双联拱和小净距隧道的施工研究成果,介绍了国内外双联拱和小净距隧道的研究现状,并总结了双联拱和小净距隧道的设计和施工方法,为双联拱和小净距隧道的设计和施工提供了参考。主要针对戴云山隧道双联拱和小净距段工程,在现场施工中难度非常大,结构受力非常复杂,以及在瓦斯隧道施工中遇到的一些问题,通过理论分析和现场试验,对现有的施工技术进行了改进。应用有限元分析软件,采用对双连拱隧道以及小净距隧道分别进行了数值模拟计算,研究了开挖过程中左右洞室的开挖引起的地面沉降和支护应力变化规律,分析得到了隧道结构随开挖步的进行洞顶位移、水平收敛以及塑性区的发展情况,得到的结论可以为类似工程的设计和施工提供借鉴。针对以上问题产生原因和特点,在此基础上,研究解决办法和措施,如在减小爆破震动对中隔墙的影响采用微差爆破等,以其保证在隧道施工中结构的安全性,并为同类型的工程提供技术和经验。
[Abstract]:This paper collects the construction research results of double arch and small clear distance tunnel, introduces the research status of double arch and small clear distance tunnel at home and abroad, and summarizes the design and construction methods of double arch and small clear distance tunnel.It provides a reference for the design and construction of double arch and small spacing tunnel.Aiming at the double arch and small spacing section of Dayunshan tunnel, it is very difficult in the field construction, the structure is very complicated, and some problems encountered in the gas tunnel construction are analyzed by theoretical analysis and field test.The existing construction technology has been improved.By using finite element analysis software, the numerical simulation of double arch tunnel and small net distance tunnel is carried out, and the variation law of ground subsidence and support stress caused by excavation of left and right caverns during excavation is studied.The displacement, horizontal convergence and the development of plastic zone of tunnel structure with excavation are obtained, and the conclusions can be used for reference in the design and construction of similar projects.In view of the causes and characteristics of the above problems, this paper studies the solutions and measures, such as using millisecond blasting to reduce the impact of blasting vibration on the middle partition wall, so as to ensure the safety of the structure in the tunnel construction.And to provide the same type of engineering technology and experience.
【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】：2015
【分类号】：U455.4

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