铁路隧道十字交叉隔壁后拆式工法施工力学特性及其应用研究

发布时间：2018-03-10 13:21

本文选题：铁路隧道　切入点：十字交叉隔壁后拆式工法　出处：《铁道标准设计》2015年12期 　论文类型：期刊论文

【摘要】：厦(门)深(圳)铁路梁山隧道穿越L7富水软弱带使施工严重受阻。为确保隧道顺利通过L7富水软弱带,通过多种经济、技术比选,最终确定通过超前预加固措施改良地层条件后,采用十字交叉隔壁后拆式工法施工。阐述十字交叉隔壁后拆式工法的特点及施工工序,同传统CRD工法相比,该工法的最大特点是:"后拆式"的十字交叉临时支撑体系,确保在临时支撑体系拆除时,初期支护和二次衬砌已经同时承载,避免传统工法中因拆撑时应力释放导致的初期支护结构失稳风险,确保施工过程中的安全可靠性。然后通过数值计算和力学分析方法,对十字交叉隔壁后拆式工法在施工过程中的支护力学转换体系进行详细分析,得出以下结论:初期支护与临时支撑组成的支护体系,在开挖的每一步中,都是承载的主体,尽可能早地闭合成环;二次衬砌的闭合时机就是二次衬砌的支护时间,以初期支护极限位移的60%作为施工二次衬砌的位移指导值较为合理。
[Abstract]:The construction of the Liangshan Tunnel of Xiamen (Shenzhen) Railway through the L7 water-rich weak zone has been seriously hindered. To ensure the smooth passage of the tunnel through the L7 water-rich weak zone, various economic and technical comparisons have been made. Finally, it is determined that after improving the ground condition through the advanced pre-reinforcement measures, the construction of the cross cross next door disassembly method is adopted. The characteristics and construction procedure of the cross cross next door disassembly method are expounded, which are compared with the traditional CRD construction method. The biggest characteristic of this method is: the cross cross temporary support system of "rear disassembly" ensures that when the temporary support system is dismantled, the initial support and the secondary lining have been loaded simultaneously. To avoid the risk of initial support structure instability caused by stress release during bracing removal in traditional engineering method, and to ensure the safety and reliability of the construction process, and then through numerical calculation and mechanical analysis method, This paper makes a detailed analysis of the supporting mechanics conversion system of the cross next door disassembly method in the construction process, and draws the following conclusions: the supporting system composed of the initial support and the temporary support is the main bearing body in each step of the excavation. The closing time of the secondary lining is the supporting time of the secondary lining as early as possible, and it is reasonable to take 60% of the initial supporting limit displacement as the guiding value of the displacement of the construction secondary lining.
【作者单位】：中国中铁二院工程集团有限责任公司;
【基金】：铁道部科技研究开发计划重点项目(2011G026-G)
【分类号】：U455.49

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