超大断面隧道工法转换过渡段最优长度
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U45

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Study on Optimal Length of Transition Section in Super-Large Cross-Section Tunnel
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    摘要:

    隧道掘进过程中掌子面围岩状况不停变化,通常情况下针对不同围岩级别,采用不同的开挖工法,不同开挖方式对应的不同支护体系有着不同的受力模式,因此工法转换处围岩-支护体系复杂。本文以京沪高速济南连接线工程龙鼎隧道为背景,结合现场实测及数值模拟的方法研究施工方法由CD法施工转换为台阶法施工时结构内力及围岩应力状态的变化,研究最优的工法转换时机,确定工法转换过渡段最优长度,并在实际工程中验证。在本工程所出现的围岩由Ⅳ2级突变为Ⅲ2级的情况下,超大断面隧道由CD法转换为台阶法设置10m的过渡段是合理的。过渡段的设置有效减小了拱顶沉降,优化了支护与围岩受力状态,有利于围岩及支护结构稳定,并且可以最大程度保证工程进度。

    Abstract:

    During the tunneling process, the rock state of the tunnel face constantly changing. Under normal circumstances, different supporting modes and excavation methods are used for different grades of surrounding rock. So the surrounding rock - supporting system is complex during the transformation of excavation methods. In this paper, the change of the structural internal force and the stress state of surrounding rock during the transformation from CD method to step method is carried out by combining the field measurement and numerical simulation with the background of the Longding tunnel in the Beijing-Shanghai high-speed railway project. Furthermore, this paper studies the optimal length of transition section and validates the results in actual engineering. The results show that it is reasonable to set 10m transition section from CD method to step method in the case of the surrounding rock’ s sudden change from Grade Ⅳ2 to Grade Ⅲ2, which effectively reduces the vault settlement and optimizes the support and the surrounding rock force state. It is conducive to the stability of the surrounding rock and support structure, and ensures the progress of the project.

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殷明伦,张晋勋,江玉生,等. 超大断面隧道工法转换过渡段最优长度[J]. 科学技术与工程, 2021, 21(3): 1163-1168.
Yin Minglun, Zhang Jinxun, Jiang Yusheng, et al. Study on Optimal Length of Transition Section in Super-Large Cross-Section Tunnel[J]. Science Technology and Engineering,2021,21(3):1163-1168.

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历史
  • 收稿日期:2020-02-25
  • 最后修改日期:2021-01-19
  • 录用日期:2020-07-25
  • 在线发布日期: 2021-02-09
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