| 冻结作用下考虑补水层影响的水分迁移试验 |
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| 引用本文： | 翟金榜,芮大虎,张军,李国玉,伊藤譲.冻结作用下考虑补水层影响的水分迁移试验[J].冰川冻土,2019,41(6):1406-1413. |
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| 作者姓名： | 翟金榜 芮大虎 张军 李国玉 伊藤譲 |
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| 作者单位： | 河南理工大学 土木工程学院,河南 焦作 454000;河南理工大学 土木工程学院,河南 焦作 454000;中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室,甘肃 兰州 730000;中国科学院 西北生态环境资源研究院 冻土工程国家重点实验室,甘肃 兰州 730000;摄南大学 土木工学科,日本 大阪 572 -8508 |
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| 基金项目： | 国家自然科学基金项目（41371092）；冻土工程国家重点实验室开放基金项目（SKLFSE201402）资助 |
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| 摘 要： | 冻融协同淋洗修复污染土壤的过程中，为了提高淋洗效率，须使土体在冻结过程中吸收更多的水分或淋洗液。因此，通过室内大尺寸单向冻结水分迁移试验，开展了开放系统下温度梯度、冻结速率及补水方式对水分迁移的影响研究。试验结果表明：冻结过程中土中水分迁移与温度梯度的变化速率有关，变化速率越大水分迁移量越大；可以通过边界温度控制冻结锋面推移速度进而影响土中水分的迁移，当冻结锋面推移速度为0.5 cm·d-1左右时，补水速率最大；距离冻结锋面越近水分迁移量越大，当距离冻结锋面10 cm左右时，水分迁移量开始增大，可通过在土体中添加多层补水层的方式让土体吸收更多的水分；有外界水源的补给下土体含水量整体增加，但上层土体含水量增加较多，下层土体含水量增加较少。
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| 关 键 词： | 水分迁移 温度梯度 冻结锋面 补水层 |
| 收稿时间： | 2019-07-15 |
| 修稿时间： | 2019-09-12 |
Moisture migration test considering the effect of water supplement layer under freezing |
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| ZHAI Jinbang,RUI Dahu,ZHANG Jun,LI Guoyu,Yzuru ITO.Moisture migration test considering the effect of water supplement layer under freezing[J].Journal of Glaciology and Geocryology,2019,41(6):1406-1413. |
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| Authors: | ZHAI Jinbang RUI Dahu ZHANG Jun LI Guoyu Yzuru ITO |
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| Institution: | 1. School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China;2. State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;3. Department of Civil Engineering, Setsunan University, Osaka 572-8508, Japan |
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| Abstract: | In order to improve the efficiency of freeze-thaw combined leaching for remediation of contaminated soil, it is necessary for soil to absorb more water or washing agents during freezing. Therefore, the effects of temperature gradient, freezing rate and replenishment mode on water migration during indoor large-scale unidirectional freezing in an open system were studied. The results show that the water migration in soil during freezing is related to the change rate of temperature gradient, and the larger the change rate of temperature gradient, the larger the water migration amount; The velocity of freezing front can be controlled by setting boundary temperature, and then the water migration in soil can be affected. When the freezing front moving rate is about 0.5 cm·d-1, the replenishment rate is maximum. The closer the freezing front is, the more obvious the water migration is. When the freezing front is about 10 cm away, the water migration begins to increase. The soil can absorb more water by adding multi-layer water supplement layer. Under the supplement of external water sources, the water content of the soil increases as a whole, but the water content of upper soil increases more, and that of lower soil increases less. |
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| Keywords: | water migration temperature gradient freezing front water supplement layer |
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