浅埋隧道施工技术研究.docVIP

毕 业 论 文 题 目 浅埋隧道施工技术研究 摘 要 在我国的铁路、公路等工程建设中，经常会遇到浅埋隧道。这类隧道的施工方法自上世纪八十年代以来,随着新奥法原理的推广应用，施工支护方式有了长足的发展。采取超前支护（长大管棚支护施工工艺）、钢架、径向锚杆、网喷混凝土等快速有效的支护措施，有效增强了围岩的自稳能力，大大加快了施工进度，同时安全质量也得到强有力的保障。当前国内外各行业除施工方法、技术手段有较大进步外，隧道施工中超前支护加固，然后台阶分部发开挖，同时进行锚喷网结合钢架支撑联合支护的施工技术和工艺。 为了使施工更加安全、快速、优质，提高经济效益，本文系统性地对这类隧道的关键技术(超前支护及预加固、隧道开挖、监控量测等)进行了研究。并利用有限元对浅埋偏压隧道采用台阶法施工时的预加固及初期支护结构进行模拟，证明了在此类隧道施工中采用该施工方法是可行的。 最后,在浅埋隧道施工力学研究的基础上，提出了渝怀铁路尖坡岭隧道工程的合理施工技术方案，为整个隧道的安全施工提供了可靠的理论依据，确保施工得以顺利进行，并对今后类似工程的施工有一定的参考价值。 关键词：浅埋、隧道、施工工艺。 Abstact In China Railway, highway construction, often encountered in shallow buried tunnel. Such tunnel construction method since the eightys of last century, along with the application of the new Austrian Tunnelling Method, supporting construction methods have made great progress. Adopt advanced support (long pipe shed support construction technology, steel), radial bolt, shotcrete, rapid and effective support measures, effectively enhance the self stability of the rock, greatly accelerate the construction schedule, safety and quality has been a strong guarantee. Current domestic and foreign industries in addition to the construction methods, technical means to have more progress in tunnel construction, reinforcement, and then send the bench excavation, anchor net with steel combined support construction technology and process support. In order to make the construction more safe, fast, high quality, improve the economic benefit, this paper systematically to the tunnel (the key technology of advance support and reinforcement of the tunnel excavation, monitoring, etc.) are studied. And the use of finite element and the beginning of tunnel shallow buried bias by step method in the construction of pre reinforcement supporting structure for simulation, proved to be feasible by this construction method in the tunnel construction. Finally, in the foundation excavation of tunnel surrounding rock stability and Numerical Study on the construction of shallow tunnel