浅埋高寒隧道围岩非均匀冻胀变形的力学响应

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摘要 研究目的:浅埋高寒隧道面临的冻害问题威胁隧道的长期安全运行。为揭示浅埋高寒隧道含未冻夹层冻胀模式下围岩非均匀冻胀变形的力学响应,建立浅埋高寒隧道典型非均匀冻胀模型,利用有限元数值软件开展隧道衬砌与围岩的受力变形和冻胀力分布演化规律研究,从而据此优化浅埋高寒隧道的抗冻设计。
研究结论:(1)冻结围岩圈外径和非均匀冻胀系数k是影响浅埋隧道冻胀力水平的关键因素,冻结围岩圈外径和k越大,冻胀力越大;衬砌结构最大拉应力和压应力分别位于拱腰和拱顶,未冻夹层厚度较小时拱腰和拱顶局部应力超过混凝土标准强度;(2)围岩非均匀冻胀作用下冻结围岩圈、衬砌和地表层的最大位移量整体表现出随未冻夹层厚度增大而降低的趋势,且冻结围岩圈半径越大,最大总位移水平越高;(3)未冻围岩夹层对高寒隧道冻胀力的空间分布和演化具有显著影响,随着未冻夹层厚度的增大,隧道冻胀力的非均匀性逐渐降低;(4)本文揭示的浅埋高寒隧道的冻胀力分布规律和衬砌力学响应可为类似隧道工程的抗冻设计提供理论指导。

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	林德新

关键词 ：高寒隧道, 冻胀力, 非均匀冻胀, 力学响应

Abstract：Research purposes:The problem of frost damage faced by shallow buried tunnels in alpine regions threatens the long-term safe operation of tunnels. In order to explore the mechanical response of the non-uniform frost heave deformation of surrounding rock under the frost heave mode with unfrozen interlayer, a typical frost heave model of the shallow buried section of the tunnel in cold region was established. The stress deformation and frost heaving force distribution evolution of tunnel lining and surrounding rock were studied by finite element numerical software. Furthermore, the frost resistance design of shallow buried tunnels in alpine regions was optimized according to the research results.
Research conclusions:(1) The outer diameter of the surrounding rock freezing circle and the non-uniform frost heave coefficient k are the key factors affecting the frost heaving force level in the shallow buried section of the tunnel. The larger the outer diameter and k of the surrounding rock freezing circle, the greater the average frost heaving force of the lining. The maximum tensile stress and compressive stress of the lining structure are located at the waist and the vault, respectively. When the thickness of the unfrozen interlayer is small, the local stress of the waist and the vault exceeds the standard strength of concrete. (2) Under the non-uniform frost heave of the surrounding rock, the maximum displacement of the surrounding rock freezing circle, lining and surface layer shows a decreasing trend as the thickness of the unfrozen interlayer increases, and the larger the surrounding rock freezing circle radius is, the higher the maximum displacement is. (3) The unfrozen surrounding rock interlayer has a significant influence on the spatial distribution and evolution of the frost heaving force of the alpine tunnel. With the increase of the thickness of the unfrozen interlayer, the non-uniformity of the tunnel frost heaving force gradually decreases. (4) The frost heaving force distribution and lining mechanical response of shallow buried tunnels in cold regions revealed in this paper can provide theoretical guidance for frost resistance design of similar tunnel projects.

Key words： alpine region tunnels frost heaving force non-uniform frost heave mechanical response

收稿日期: 2022-12-20

PACS:

U213.1+4

作者简介: ** 林德新,1979年出生,男,高级工程师。

引用本文:

林德新. 浅埋高寒隧道围岩非均匀冻胀变形的力学响应[J]. 铁道工程学报, 2023, 40(2): 59-65.
LIN Dexin. Mechanical Response Caused by Non-uniform Frost Heave Deformation of Surrounding Rock of Shallow Buried Tunnels in Alpine Region. Journal of Railway Engineering Society, 2023, 40(2): 59-65.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2023/V40/I2/59

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