渐冻隧道演化模拟试验系统的研制及初步应用

doi:10.13722/j.cnki.jrme.2020.1191

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Abstract A model test system for simulating the evolution of frost penetration tunnels was developed to reveal the penetration mechanism and the formation of the frozen surrounding rock in cold regions with negative annual average temperature，and to investigate the thawing mechanism of the frozen surrounding rock due to global warming. The model test system mainly consists of a tunnel model，a ground temperature control system，a climate control system，and a data measurement and acquisition system. The main innovations of the test system are as follows：(1) The model test system can greatly shorten the test period for simulating the tunnel life-cycle temperature field，reducing the original test period from 40 days to 4 days. (2) The new climate simulation system can stably simulate the influence of the annual average temperature，the temperature amplitude，the wind speed and other combined conditions on the tunnel temperature field for a long period of time. (3) The developed ground temperature measuring and controlling system effectively solves the difficulties in data measurement and ground temperature control. The accuracy and reliability of the model test system were verified by comparing the tested temperature field with the field test result of a typical cold region tunnel. The preliminary test results show that，when the annual average temperature is －4 ℃，the frozen envelope of the surrounding rock will gradually advance along the longitudinal direction of the tunnel and penetrate into the deep of the surrounding rock on the cross section，causing the frost penetration of the surrounding rock and hence，forming so-called frost penetration tunnel. The experimental system，filling in the blank of the experimental study on the evolution law of the temperature field under the life-cycle operation condition of tunnels in cold regions，plays a positive role in promoting the frontier research of tunnel engineering in cold regions in China and provides experimental basis for the“one belt，one road”project and the Sichuan—Tibet railway project.

Key words： tunnelling engineering frost penetration tunnel test system cold region temperature field

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	Articles by authors
	XIA Caichu1
	2
	LIN Ziliang1
	2
	SHI Jiayu3
	DU Shigui3

Cite this article:

XIA Caichu1,2,LIN Ziliang1, et al. Development and preliminary application of a simulation test system for frost penetration tunnel evolution[J]. , 2021, 40(8): 1525-1535.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1191 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/I8/1525

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