矿山法隧道装配式仰拱块吊装受力特征研究

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摘要 研究目的: 预制装配式结构具有施工速度快、机械化程度高、质量易于控制等突出优点。矿山法隧道采用全部装配式衬砌虽然还存在一些问题,但是仰拱部分采用装配式衬砌已有隧道进行尝试。当采用整体式仰拱装配式衬砌时,单个仰拱块的体积与重量大,预制和吊装过程中的受力问题应进行相关研究。本文以单线铁路隧道为工程背景,通过足尺试验和数值模拟的方式研究预制仰拱块在养护和吊装过程中的相关受力特征。
研究结论: (1)浇筑后12~24 h,因水化热影响,仰拱块内部温度达到最高值,最大变化值为32.5 ℃;(2)养护期间钢筋和混凝土的应力变化主要受仰拱块内部温度变化的影响,顶板混凝土的拉应力普遍大于仰拱混凝土的拉应力;(3)仰拱预制块混凝土应适当采取措施降低水化热,避免养护期间产生过大拉应力导致表面开裂;(4)吊装过程中混凝土和钢筋应力变化不大,吊装过程中仰拱块不会发生破坏;(5)吊装时在顶板中点上侧混凝土压应力变化最大,在仰拱中点下侧混凝土拉应力变化最大,腹板和吊装孔处混凝土应力变化均很小,且实测变化值与模拟值基本吻合;(6)本文研究成果可为仰拱预制块设计、预制及吊装工艺的确定提供借鉴和参考。

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	王飞

关键词 ：矿山法隧道, 装配式衬砌, 仰拱预制块, 受力特征, 足尺试验, 水化热, 吊装

Abstract：Research purposes: Prefabricated assembly structure has outstanding advantages of fast construction, high mechanization, easy quality control, etc. Although there are still some problems with full assembly lining in mining method tunnels, there are already tunnels using assembly lining in the inverted arch part to try. When using the integral inverted arch assembly lining, the volume and weight of individual inverted arch blocks are large, and the mechanical characteristics during prefabrication and hoisting should be studied. Taking single-line railway tunnel as the engineering background, the mechanical characteristics of prefabricated inverted arch blocks in the process of maintenance and hoisting were studied by full-scale test and numerical simulation.
Research conclusions: (1) The temperature inside the inverted arch block reaches the highest value after casting 12~24 h, due to the influence of hydration heat, and the maximum change value is 32.5 ℃. (2) The stress change of reinforcement and concrete during the maintenance period is mainly affected by the temperature change inside the inverted arch block, and the tensile stress of the roof plate concrete is generally greater than the tensile stress of the inverted arch concrete. (3) The concrete of the inverted arch block should take appropriate measures to reduce the hydration heat to avoid the excessive tensile stress of the inverted arch block during the maintenance period, resulting in surface cracking. (4) The stresses change of concrete and reinforcement is smaller during hoisting process, and the inverted arch block will not be damaged. (5) Maximum changes of the concrete compressive stress are on the upper side of the midpoint of the roof plate during hoisting, and maximum changes of the concrete tensile stress are underside of the midpoint of the inverted arch, and the concrete stress changes of the web and hoisting hole are smaller, and all changes values of measured basically match with the simulated. (6) The research results can provide reference for the design and prefabrication of inverted arch block and the determination of hoisting technology.

Key words： mining method tunnel prefabricated tunnel lining inverted arch precast block mechanical characteristic full-scale test heat of hydration hoisting

收稿日期: 2022-07-11

PACS:

TU94+2

基金资助:中国铁建股份有限公司科技重大专项(2019-A04);中铁第一勘察设计院集团有限公司科研项目(院科19-18-01,19-15-01)

作者简介: 王飞,1982年出生,男,正高级工程师。

引用本文:

王飞. 矿山法隧道装配式仰拱块吊装受力特征研究[J]. 铁道工程学报, 2022, 39(12): 79-85.
WANG Fei. Mechanical Characteristics of Prefabricated Inverted Arch during Hoisting in Mining Method Tunnel. Journal of Railway Engineering Society, 2022, 39(12): 79-85.

链接本文:

https://tdgcxb.crec.cn/CN/ 或 https://tdgcxb.crec.cn/CN/Y2022/V39/I12/79

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