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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摘要为研究高铁路基非饱和粗颗粒填料水–热–汽效应，研发了适用于冻融循环作用下水–热–汽迁移特征追踪的试验装置，采用荧光素为示踪剂追踪外界补水中液态水上升的高度和变化规律。首先开展一系列关键性技术试验验证了试验方法和装置的有效性。而后在试验装置研发的基础上，开展试验研究冻融循环过程中，恒温降温模式下开放补水的非饱和粗颗粒填料中的水–热–汽效应。试样每次冻结时长72 h，融化12 h，分为3次冻结和2次融化。试验结果表明，恒温冻结模式下，冻深随着冻结次数的增加而增加。冻结过程中，粗颗粒填料外界水分补给主要以气态水的形式向土样内部迁移，融化时土样内部水分会向外界迁移。最大补水量出现在第2次冻结中。试验结束时，上冷浴盘顶部出现冰层，已冻区含水率的增幅相对比较均匀。反复冻融循环作用下，高铁路基粗颗粒填料的水、汽迁移和相变可导致路基中冰层的形成和强度的改变。

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	张玉芝1
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	马巍2
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	温安1
	李裴3
	王保宪1

关键词 ：土力学；粗颗粒填料；冻融循环；恒温冻结；高铁路基；水&ndash, 热&ndash, 汽效应；荧光素追踪

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

引用本文:

张玉芝1，2，马巍2，赵维刚1，温安1，李裴3，王保宪1. 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[J]. 岩石力学与工程学报, 2020, 39(1): 156-165.
ZHANG Yuzhi1，2，MA Wei2，ZHAO Weigang1，WEN An1，LI Pei3，WANG Baoxian1. Water-heat-vapor migration trace and characteristics of unsaturated coarse-grained filling under freeze and thaw cycles #br#. , 2020, 39(1): 156-165.

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

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