| 盐渍土水-热场耦合效应与盐胀变形试验 |
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| 引用本文： | 张沛然,黄雪峰,杨校辉,刘自龙,朱中华.盐渍土水-热场耦合效应与盐胀变形试验[J].岩土力学,2018,39(5):1619-1624. |
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| 作者姓名： | 张沛然 黄雪峰 杨校辉 刘自龙 朱中华 |
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| 作者单位： | 1. 兰州理工大学 土木工程学院，甘肃 兰州 730050；2.陆军勤务学院 军事设施系，重庆 401311 |
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| 摘 要： | 为了研究西北干旱地区盐渍土在自然气候条件下的水-热场变化特征与盐胀变形规律，在4.5 m深试验坑内埋设了若干套竖向变形观测设备、含水率和温度传感器，对坑内不同深度土层的温度场、水分场和盐胀变形随季节性变化状况进行了为期1 a的动态监测和分析研究。结果表明：0.6 m以上土层相较于其他土层对气候温度变化的响应更加积极、温差变化幅值也更大，且土层间的温差幅值随降温期的不断深入而增大；土体含水率变化主要受降水、蒸发和温度梯度的耦合影响， 0.4 m以上土层水分的变化幅度较其他土层而言更为显著，土层水分迁移沿深度方向表现出分带现象；盐胀变形主要受温度和水分迁移的影响，盐胀变形主要发生在距地表1.0 m土层深度内，主要发展时间在当年11月至次年2月之间。
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| 关 键 词： | 盐渍土 温度场 水分迁移 盐胀 变形特性 |
| 收稿时间： | 2016-06-07 |
Experiment on coupling effect of water and thermal field and salt-expansion deformation of salty soil |
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| ZHANG Pei-ran,HUANG Xue-feng,YANG Xiao-hui,LIU Zi-long,ZHU Zhong-hua.Experiment on coupling effect of water and thermal field and salt-expansion deformation of salty soil[J].Rock and Soil Mechanics,2018,39(5):1619-1624. |
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| Authors: | ZHANG Pei-ran HUANG Xue-feng YANG Xiao-hui LIU Zi-long ZHU Zhong-hua |
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| Institution: | 1. College of Civil Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2. Department of Military Installations, Army Logistics University of PLA, Chongqing 401311, China |
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| Abstract: | In order to study the changeable characteristics of the hydrothermal field and the salt-expansion deformation laws of salty soil under natural climatic conditions in the northwest arid area of China, vertical apparatuses for monitoring deformation, and sensors for monitoring moisture content and temperature were buried in a test pit of 4.5 meters deep. With the seasonal changes, the different depths of soil temperature field, moisture and salt-expansion deformation of the pit were dynamically monitored for a year and analyzed. The results show that the response to climate change of soil layer within 0.6 meter from the ground is more positive than other soil layers, and the change of temperature is greater. The difference of temperature among the soil layers increases with the proceeding of cooling period. The moisture content of soil is mainly influenced by precipitation, evaporation and temperature gradient; the change of soil moisture above 0.4 meter is more significant than other soil layers, and the water migration along the altitude of the soil shows a zonal phenomenon. Salt-expansion is mainly affected by the temperature and the moisture transfer of soil layers; salt-expansion deformation mainly occurs in the depth of 1.0 meter soil layer from the surface of the earth, which mainly develops in the period from November to February next year. |
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| Keywords: | salty soil temperature field moisture migration salt-expansion characteristics of deformation |
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