风对砂土非饱和带水汽热运移规律影响研究  

Effect of Wind on Water Vapor and Heat Transfer in Unsaturated Zone of Sandy Soil

作　　者：郭烨 朱志男 伍维强 成昊凌 冯景阳 徐亮生 GUO Ye;ZHU Zhinan;WU Weiqiang;CHENG Haoling;FENG Jingyang;XU Liangsheng(China Construction Eighth Engineering Division Co.,Ltd.,Lanzhou 730100,Gansu,China)

机构地区：[1]中国建筑第八工程局有限公司,甘肃兰州730100

出　　处：《建筑施工》2024年第4期451-454,共4页Building Construction

摘　　要：针对目前以非饱和带土体水汽热运移对类似铁路、公路工程以及污染物运移影响根本认识不足的问题,基于室内砂土土柱试验,开展了在一定热辐射条件下,考虑风速(0、0.56、1.44 m/s)对砂土非饱和带水汽热运移规律影响研究。结果表明:温度控制系统和风速控制系统工作以后,风速的增大一方面降低了土表的温度梯度,并减缓着水分的流失,另一方面加快土表水分的流失作用,2种机制共同影响着土体的含水率变化。蒸发速率受到温度梯度的影响,随着温度梯度以及基质势作用下气态水向上运移速率趋于稳定,土体的瞬时蒸发量在40 h之后也趋于稳定。总结的经验可供今后类似项目借鉴。In view of the lack of understanding of the influence of water vapor and heat transfer in unsaturated soil on similar railway and highway projects and pollutant transport,based on indoor sand column tests,the influence of wind velocity(0,0.56,1.44 m/s)on water vapor and heat transfer in unsaturated sandy soil under certain thermal radiation conditions is studied.The results show that after the temperature control system and wind speed control system work,the increase of wind speed,on the one hand,reduces the temperature gradient of soil surface and slows down the loss of water,on the other hand,accelerates the loss of soil surface water,and the two mechanisms jointly affect the change of soil moisture content.The evaporation rate is affected by the temperature gradient,and the instantaneous evaporation of soil tends to be stable after 40 hours with the upward migration rate of gaseous water under the action of temperature gradient and matrix potential.The experience summarized can be used for reference for similar projects in the future.

关 键 词：风速 地下水水位 砂土非饱和带 水热运移 

分 类 号：TU43[建筑科学—岩土工程]