渗流作用下富水砂层双排管冻结壁形成规律模型试验研究

doi:10.13722/j.cnki.jrme.2018.0944

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Abstract Aiming at the problem of unclosed freezing wall in seepage fields，a coupled control equation of seepage field and freezing temperature field was established based on the heat transfer theory of porous media and Darcy?s law，and the interaction mechanism between the two fields was discussed. According to the similarity theory，a model test system for the frozen double-row-pipe with plum blossom arrangement under percolation was built，with which a orthogonal test aiming at main factors affecting the formation of frozen wall in high velocity percolation layers was conducted. For comparison，another test with frozen single-rowed pipe was carried out subsequently. The results show that，for double-rowed pipe freezing，the groundwater velocity，the hole spacing and the salt water temperature are，respectively，the primary factors affecting the thickness of the upstream frozen wall，the frozen wall intersecting time，and the downstream frozen wall thickness and average temperature. It is also indicated that，when groundwater velocity ranges from 5 m/d to 25 m/d，the thicknesses of upstream and downstream frozen walls of double-rowed pipe freezing are respectively larger than those of single-rowed pipe freezing by 62.6%–151.8% and 3.7%–33.8%，and at the same time，the intersecting time and the average temperature of the frozen wall decrease by 7.1%–91% and 12.1%–103.9% respectively. The limit velocity of the frozen wall intersecting under different conditions was obtained based on the nonlinear regression between the frozen wall intersecting time and the groundwater velocity. Finally，effective countermeasures for frozen engineering under seepage were put forward，which provides a significant reference for the design and construction of similar frozen engineering.

Key words： soil mechanics seepage water rich sand layer double-row-pipe freezing freezing wall model test

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	LI Fangzheng1
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	DING Hang2
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	ZHANG Xuzhong2

Cite this article:

LI Fangzheng1,2,3, et al. Model test research of formation law of double-row-pipe freezing wall in water rich sand layer under seepage[J]. , 2019, 38(2): 386-395.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2018.0944 OR http://www.rockmech.org/EN/Y2019/V38/I2/386

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