冻融循环作用下非饱和粗颗粒填料水热汽迁移追踪及规律研究

doi:10.13722/j.cnki.jrme.2019.0499

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Abstract An experimental apparatus was developed to study the water-heat-vapor migration characteristics of unsaturated coarse-grained filling of high-speed railway subgrade under freezing and thawing cycles，and a fluorescein tracer was used to trace the rising height and intake behavior of liquid water. A series of key technological experiments were conducted to validate the utility of the test method and the reliability of the apparatus，and freeze and thaw tests were performed to investigate the water-heat-vapor migration characteristics of unsaturated coarse-grained filling in a process of thrice freezing and twice thawing with 72 hours of the freezing time and 12 hours of the thawing time. The results indicate that under a constant temperature freezing mode，the frost penetration increases with increasing the freezing numbers. The external water infiltrates mainly in the form of vapor into the soil sample during freezing and the internal water comes out during thawing. The second freezing provides the maximum water intake. The ice accumulates on the top base pedestal and the increasing range of the water content in the frozen zone is relatively even at the end of the test. The water-vapor migration and phase change of the coarse-grained filling induced by freezing and thawing cycles could lead to an ice layer formation and a change in the strength of the high-speed railway subgrade.

Key words： soil mechanics coarse-grained filling freezing-thawing cycles constant freezing high-speed railway subgrade water-heat-vapor migration characteristics fluorescein tracer

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	ZHANG Yuzhi1
	2
	MA Wei2
	ZHAO Weigang1
	WEN An1
	LI Pei3
	WANG Baoxian1

Cite this article:

ZHANG Yuzhi1,2,MA Wei2, et al. Water-heat-vapor migration trace and characteristics of unsaturated coarse-grained filling under freeze and thaw cycles #br#[J]. , 2020, 39(1): 156-165.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2019.0499 OR http://www.rockmech.org/EN/Y2020/V39/I1/156

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