矿山法隧道装配式仰拱块吊装受力特征研究

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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

Received: 11 July 2022

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	WANG Fei

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WANG Fei. Mechanical Characteristics of Prefabricated Inverted Arch during Hoisting in Mining Method Tunnel[J]. Journal of Railway Engineering Society, 2022, 39(12): 79-85.

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https://tdgcxb.crec.cn/EN/ OR https://tdgcxb.crec.cn/EN/Y2022/V39/I12/79

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