| 模拟日照条件下膨胀土的湿-热耦合性状及蒸发效应 |
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| 引用本文： | 李雄威,王爱军,王勇,王继果.模拟日照条件下膨胀土的湿-热耦合性状及蒸发效应[J].岩土力学,2013,34(10):2821-2826. |
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| 作者姓名： | 李雄威 王爱军 王勇 王继果 |
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| 作者单位： | 1.常州工学院 常州市建设工程结构与材料性能研究重点实验室，江苏 常州 213002； 2.中国科学院武汉岩土力学研究所 岩土力学与工程国家重点实验室，武汉 430071；3.三江学院 土木工程学院，南京 210012 |
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| 基金项目： | 国家自然科学基金资助项目(No.41102229)；住房和城乡建设部科学技术项目(No.2012-k3-10)；江苏省“青蓝工程”资助；江苏省自然科学基金项目(No. BK20131141)。 |
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| 摘 要： | 利用长弧氙灯模拟太阳辐射，通过调节灯罩与土样间的高度产生不同的辐射强度，通过控制光照时间模仿自然环境中的日照状态，通过设定恒温、恒湿环境获得单因素的控制条件，对阳光辐射下原状膨胀土的湿-热耦合性状及降雨蒸发效应进行分析。研究结果表明：当太阳辐射、降雨等气象现象发生后，膨胀土水分迁移和温度变化呈现不同的状态，随着土体水分的往复迁移，浅层土体趋于破碎，疏松，在太阳辐射作用下，土体含水率变化幅度增加，从而进一步加剧土体裂隙的拓展。对于膨胀土，裂隙性和膨胀性是它内在的秉性，而大气作用是诱因，在大气与土壤之间的水分和能量交换过程中，膨胀土的工程性质逐渐发生改变。采用自制的太阳辐射模拟装置，针对大气作用下原状膨胀土的湿热耦合性状以及降雨蒸发效应展开分析，相关经验也可应用到其他土类的研究。针对膨胀土工程性质，可进一步开展太阳辐射对膨胀土水分迁移机制影响的量化分析。
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| 关 键 词： | 膨胀土 太阳辐射 降雨 裂隙 湿热耦合 |
| 收稿时间： | 2013-04-16 |
Moisture-heat coupling behavior and evaporation effect of expansive soil in simulated solar |
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| LI Xiong-wei
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WANG Ai-jun
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WANG Yong
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WANG Ji-guo.Moisture-heat coupling behavior and evaporation effect of expansive soil in simulated solar[J].Rock and Soil Mechanics,2013,34(10):2821-2826. |
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| Authors: | LI Xiong-wei WANG Ai-jun WANG Yong WANG Ji-guo |
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| Institution: | 1. Changzhou Key Laboratory of Structure Engineering and Material Properties, Changzhou Institute of Technology, Changzhou, Jiangsu 213002, China; 2. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. College of Civil Engineering, Sanjiang University, Nanjing 210012, China |
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| Abstract: | Xenon long-arc lamp is used to simulate solar radiation. Deferent radiation intensities are acquired by adjusting lampshade height. Sunshine state is acquired by controlling the illumination time. Single factor controlling condition is achieved by constant temperature and humidity environment. Then, moisture-heat coupling behavior and rainfall-evaporation effect of undisturbed expansive soil sample in solar radiation are studied. When solar radiation and rainfall occur, the moisture migration and temperature variation present different states. With the to-and-fro moisture migration, the shallow soil tends to the fractured and loosened. In the solar radiation, the amplitude of moisture content variation increases, which aggravates the fissure development. To expansive soil, the characteristics of swelling and fissure are inner being, and atmospheric action is incentive. The behavior of expansive soil is changed gradually in the exchange progress of moisture and energy between atmospheric and soil. The simulating device on solar radiation is used to study the moisture-heat coupling behavior and rainfall-evaporation effect of undisturbed expansive soil. And the experience in research could be applied to the study of other soil types. In view of the engineering properties of expansive soil, the quantitative analysis of moisture migration mechanism of expansive soil could be further developed in the influence of solar radiation. |
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| Keywords: | expansive soil solar radiation rainfall fissure moisture-heat coupling |
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