大流速渗透地层人工冻结壁形成机制室内模型试验研究

doi:10.13722/j.cnki.jrme.2021.0174

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Abstract In order to solve a series of engineering problems encountered in the artificial freezing process in permeable strata with high seepage velocity，laboratory model test for studying the development law of the artificial freezing temperature field under different flow velocity conditions was performed based on a self-built large-scale water-heat coupled physical model test system. The test results show that，when the seepage velocity is equal to 0 and 3 m/d，the earliest closure position of the frozen wall locates at the intermediate point between two neighbor freezing pipes and the closure time is 740 and 840 min respectively. When the seepage velocity is equal to 6 and 9 m/d，the earliest closure position of the frozen wall moves from the intermediate point to the downstream by 50 mm，and the closure time increases to 1 770 and 4 250 min respectively. By fitting the test data，a prediction formula of the closure time of the frozen wall under the seepage field was obtained，and the limiting velocity for the closure of the frozen wall was predicted to be 12.73 m/d. The seepage field causes uneven development of the thickness of the frozen wall. Specifically，when the seepage velocity is equal to 3，6 and 9 m/d，the ratio of the downstream expansion radius to the upstream expansion radius of the frozen wall is 1.17，1.21 and 1.81，respectively. It is also found from analyzing the freezing process that，when the distance between adjacent freezing fronts is reduced to a critical value Lc，the “group-pipe-effect” will occur，which will accelerate the expansion speed of the freezing front and shorten the closure time of the frozen wall. Since the convective heat transfer effect of the water flow offsets part of the “group pipe effect”，Lc decreases as the seepage velocity increases. When the seepage velocity is less than 3 m/d，Lc is 400 mm，and when the flow velocity reaches 6 and 9 m/d，Lc is reduced to 154 and 130 mm，respectively. The results of this study can provide reference for the arrangement of artificial freezing holes in the permeable formations with large flow velocity，and also provide verification basis for the hydrothermal coupling numerical calculation model.

Key words： soil mechanics artificial ground freezing method permeable formation with high seepage velocity hydrothermal coupling model test group-pipe-effect

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	Articles by authors
	RONG Chuanxin1
	WANG Bin1
	2
	3
	CHENG Hua1
	2
	DONG Yanbin1
	YANG Fan1

Cite this article:

RONG Chuanxin1,WANG Bin1,2, et al. Laboratory model test study on formation mechanisms of artificial frozen walls in permeable strata with high seepage velocity[J]. , 2022, 41(3): 596-613.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0174 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I3/596

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