预切槽法在浅埋暗挖下穿公路段隧道中的设计

发布时间：2018-03-28 02:38

本文选题：预切槽　切入点：浅埋暗挖　出处：《铁道工程学报》2017年04期

【摘要】：研究目的:机械预切槽法因其结合盾构的盾壳保护开挖理念和新奥法处理复杂地层的自由灵活理念,在土砂等极软弱围岩地质条件、城市特殊复杂环境近接施工或以上因素复合形成的复杂困难工程条件下具有显著的优势,可以较好地保障隧道施工的安全,同时也是机械化施工的一种很有发展潜力的隧道施工方法。本文结合福平铁路新鼓山隧道下穿福州机场高速公路的浅埋暗挖段,对隧道预切槽法施工在软弱地质下浅埋暗挖下穿通过道路的城市环境应用进行设计与分析,提出该方法的可行性。研究结论:(1)预切槽法可以应用于浅埋暗挖、下穿道路等特殊隧道段落的施工;(2)在浅埋、软弱、近接等特殊条件下,预切槽法形成的预筑拱作为超前措施,较常用的管棚等技术手段,对控制地表沉降、保证施工安全有更显著和可靠的作用,具有更大的安全性;(3)本研究结论可为类似工程条件的隧道设计提供借鉴。
[Abstract]:The purpose of this study is to study the geological conditions of extremely weak surrounding rock such as soil sand and so on because of the combination of the shield shell protection and the free and flexible concept of the new Austrian method for the treatment of complex strata. Under the condition of complex and difficult engineering, the special and complex environment of the city has obvious advantages, which can better ensure the safety of tunnel construction. At the same time, it is also a kind of tunnel construction method with great development potential for mechanized construction. This paper combines the shallow burying excavation section of Fuzhou Airport Expressway under the new Gushan tunnel of the Fuping Railway. The design and analysis of the application of tunnel pre-cutting method in the urban environment of shallow burying and undercutting through the road under soft geology is carried out, and the feasibility of this method is put forward. The research conclusion is that the pre-cut groove method can be applied to shallow burying and undercutting. Under special conditions, such as shallow burying, weak and close connection, the pre-arch formed by pre-cutting groove method is used as a leading measure to control the surface subsidence, compared with the usual technical means such as pipe-shed, etc, in the construction of special tunnel sections such as underpass road, etc. (2) under the special conditions, such as shallow burying, weak, close connection, etc. The conclusion of this study can be used as a reference for tunnel design with similar engineering conditions.
【作者单位】：武汉理工大学;北京交通大学;
【基金】：国家自然科学基金资助项目(51104111,51178026) 中铁第四勘察设计院集团有限公司科研课题(2013K43)
【分类号】：U455.4

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