北京砂卵石地层渗流条件下多排管局部冻结水平板成形规律研究

doi:10.13722/j.cnki.jrme.2019.1010

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Abstract Basin-shaped freezing technology is a water-proofing technology applied to underground excavation subway station in sandy gravel stratum，with the basin wall and basin bottom acting together to form a closed sealing space，the basin bottom uses comb freezing method to form a horizontal frozen plate. In this paper，based on the physical model test，numerical simulation is used to analyze freezing rules and the temperature field development of comb freezing method under seepage condition. The numerical model can effectively reflect the freezing shaping evolution of comb freezing，and the simulation results are in good agreement with the physical model test. Research finds that：(1) In the process of comb freezing under seepage condition，firstly，the frozen area develops along the flow direction，then the last row of freezing pipes on the back-water surface intersect in the direction of vertical flow and finally，the frozen area develops from the back-water surface to front-water surface and forms a closed horizontal frozen plate. Meanwhile，the effective thickness of the horizontal frozen plate is lost to some extent due to the flow around front-water surface. (2) The temperature field in the main frozen area shows a droplet shape along the direction of the flow，and the low temperature part is basically symmetrical distribution centered on the third row of freezing pipes，the temperature field in the vertical flow direction is symmetrical distribution centered on the middle row freezing pipes，and the temperature gradually increases from the core low temperature area to the surrounding areas，and the temperature at the middle of the freezing tube is lower than that at the end.

Key words： underground engineering basin-shaped freezing technology comb freezing method sandy gravel stratum seepage underground excavation subway station

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	ZHANG Jinxun
	QI Yi
	YANG Hao
	ZHANG Lei

Cite this article:

ZHANG Jinxun,QI Yi,YANG Hao, et al. Formation rules of horizontal frozen plate with multiple rows in Beijing sandy gravel stratum under seepage condition[J]. , 2020, 39(S1): 3188-3196.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1010 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/3188

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