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隧道建设(中英文) ›› 2018, Vol. 38 ›› Issue (7): 1115-1122.DOI: 10.3973/j.issn.2096-4498.2018.07.006

• 研究与探索 • 上一篇    下一篇

下台阶含仰拱一次开挖工法仰拱早期受力研究

李建华1, 邓涛2, *, 刘大刚2, 赵思光2, 蔡闽金2   

  1. (1. 中铁隧道局集团有限公司勘察设计研究院, 广东 广州 511458; 2. 西南交通大学土木工程学院, 四川 成都 610031)
  • 收稿日期:2017-10-02 修回日期:2018-02-20 出版日期:2018-07-20 发布日期:2018-07-28
  • 作者简介:李建华 (1968—),男,江苏金坛人,1993年毕业于西南交通大学,隧道与地下工程专业,本科,教授级高级工程师,现从事隧道施工科研及技术管理工作。Email: lijianhua6809@sohu.com。*通信作者: 邓涛, Email: 349928617 @qq.com。
  • 基金资助:

    中铁隧道集团科技创新计划(隧研合2015-01)

Study of Early Stress Form of Inverted Arch When  Simultaneously Excavated with Lower Bench

LI Jianhua1, DENG Tao2, *, LIU Dagang2, ZHAO Siguang2, CAI Minjin2   

  1. (1. Survey, Design and Research Institute of China Railway Tunnel Group, Guangzhou 511458, Guangdong, China;  2. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China)
  • Received:2017-10-02 Revised:2018-02-20 Online:2018-07-20 Published:2018-07-28

摘要:

为明确下台阶含仰拱一次开挖工法仰拱早期的受力状态并制定相应的强度控制标准,以中条山隧道为依托工程,利用数值分析、位移-荷载反演等方法对仰拱早期在外荷载作用下的受力进行分析。下台阶含仰拱一次开挖工法中,仰拱随下台阶同步开挖,由于工法的特殊性,仰拱施作约2 h后会承受来自围岩变形、挖机及覆土自重产生的荷载。分析发现: 3个部分荷载中围岩变形压力对仰拱早期受力影响最大,围岩变形作用下最大压应力产生于仰拱拱脚位置,上填覆土及扒碴机械重力作用会减小拱脚压应力,增大拱底压应力。多种外荷载共同作用时,仰拱压应力分布形态为“W”型,最大压应力产生于拱底,为0.14 MPa。考虑预留一定安全储备的情况下,该工法仰拱施作2 h时的抗压强度控制标准可按0.2 MPa进行设计。与传统台阶法仰拱早期受力特性对比,结果证明了一次开挖工法仰拱施作采用早高强混凝土的必要性。

关键词: 中条山隧道, 台阶法, 仰拱, 铁路隧道, 围岩压力

Abstract:

The definition of early stress form of inverted arch when simultaneously excavated with lower bench and related control standards are very important. Hence, the early stress of inverted arch of Zhongtiaoshan Tunnel under the effect of external load is analyzed by numerical analysis, displacementload inversion method, etc. The lower bench is simultaneously excavated with inverted arch, and due to the particularities of the method, the inverted arch will bear the load of surrounding rock deformation, excavation machine and cover soil weight after 2 hours of inverted arch construction. The analytical results show that the surrounding rock deformation greatly affects the stress on inverted arch; and the maximum compression stress induced by surrounding rock deformation occurs on inverted arch feet, while the weights of cover soil and excavation machine will reduce the compression stress on arch feet and increase the compression stress on crown bottom. The distribution of compression stress on crown top shows a Wshape, and the maximum compression stress of 0.14 MPa occurs on crown bottom. The compression strength control standard could be 0.2 MPa after 2 hours of inverted arch construction considering safety stock. The comparison results between the abovementioned method and traditional one show that the using of early highstrength concrete for inverted arch construction is necessary.

Key words: Zhongtiaoshan tunnel, bench method, inverted arch, railway tunnel, surrounding rock deformation

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