冻融过程中未冻水含量及冻结温度的试验研究

doi:10.13722/j.cnki.jrme.2016.1433

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摘要土体冻融过程中的未冻水含量是控制水分迁移及冻胀融沉的关键因素，而冻结温度是判断土体是否处于冻结状态的重要指标。基于频域反射法(FDR)，测定不同初始体积含水率条件下青藏高原粉质黏土，冻融过程中的体积未冻水含量及温度变化，分析引起体积未冻水含量及冻结温度产生差异的主要原因。试验结果表明：初始含水率较高的土体，冻结过程中出现了很明显的过冷现象以及温度和体积未冻水含量的突变，而初始含水率较低的土体，这种现象并不明显。初始含水率较大的土体冻结先于初始含水率较小的土体，并且对温度突变的敏感性大于初始含水率较小的土体。对冻融过程体积未冻水含量的滞后分析发现，体积未冻水滞后度?θ和温度滞后度?T均是先增大后减小，体积未冻水滞后度?θ的峰值发生在相变区附近，其峰值随着初始含水率的增大而增大。当初始含水率等于或高于液限含水率时，含水率对冻结温度影响不大；当初始含水率低于液限含水率时，冻结温度随含水率减小而降低。

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	路建国1
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	张明义1
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	晏忠瑞1
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关键词 ：土力学, 未冻水含量, 冻结温度, 冻融过程, 界面自由能, 粉质黏土

Abstract：The unfrozen water content is a key factor controlling the moisture migration and causing the frost heave or thaw settlement during freezing and thawing processes. The freezing temperature is an important index to judge whether the soils are in a frozen state or not. The characteristics of the unfrozen water content and the freezing temperature and their relationships with initial water content during the freezing and thawing processes of the silty clay from Qinghai—Tibet Plateau were analyzed based on the frequency domain reflectometry(FDR) technique. The results show that for the soil with the higher initial water content，there are distinct super-cooling phenomenon and abrupt change of temperature and unfrozen water content in the freezing process. But for the soil with the lower initial water content，the phenomenon is not obvious. The soil with the larger initial water content is frozen earlier than the soil with the smaller initial water content and is more sensitive to the temperature jump. The lag effect of the unfrozen water content between the freezing and thawing processes is affected by the initial water content. The lag degree of unfrozen water content is mainly in the phase change zone. The peak value of the lag unfrozen water content decreases with the reduction of the initial water content. The initial water content has little influence on the freezing temperature of soil when the water content is equal or greater than the liquid limit. The freezing temperature of soil decreases with the reduction of the water content if the initial water content is less than the liquid limit.

Key words： soil mechanics unfrozen water content freezing temperature freezing and thawing processes surface free energy silty clay

引用本文:

路建国1，2，张明义1，2，张熙胤1，2，晏忠瑞1，2. 冻融过程中未冻水含量及冻结温度的试验研究[J]. 岩石力学与工程学报, 2017, 36(7): 1803-1812.
LU Jianguo1，2，ZHANG Mingyi1，2，ZHANG Xiyin1，2，YAN Zhongrui1，2. Experimental study on the unfrozen water content and the freezing temperature during freezing and thawing processes. , 2017, 36(7): 1803-1812.

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http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2016.1433 或 http://www.rockmech.org/CN/Y2017/V36/I7/1803

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