不同冻结速率下土壤的水热运移试验研究  

Experimental study on soil water and heat transfer under different freezing rates

作　　者：孟庆浩 MENG Qinghao(Civil Engineering College,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南理工大学土木工程学院,河南焦作454000

出　　处：《中原工学院学报》2021年第3期53-58,共6页Journal of Zhongyuan University of Technology

摘　　要：为研究不同降温速率下土体的水热运移规律,利用自制的冻结试验设备,设置双层补水层,在开放系统下对粉质黏土分别进行了降温速率为0.2℃/h、0.3℃/h、0.4℃/h、0.5℃/h的单向冻结试验。试验结果表明:不同降温速率下,土体相同位置的温度变化规律相同,但相同降温速率下,土体不同位置的温度变化规律不同;不同降温速率下,土体温度梯度均可以分为上升阶段、下降阶段和稳定阶段;土体的补水量与冻胀量随时间线性增长;降温速率越小,补水量与冻胀量越大;土体的冻胀量主要由外界水分迁移量决定。In order to study the hydrothermal migration law of soil under different cooling rates,the self-made freezing test equipment was used to set up double-layer water supplement layer.Under the open system,the unidirectional freezing tests of silty clay with cooling rates of 0.2℃/h,0.3℃/h,0.4℃/h and 0.5℃/h were carried out respectively.The test results show that under different cooling rates,the temperature variation at the same position of the soil is the same,but under the same cooling rate,the temperature variation at different positions of soil is different.Under different cooling rates,the soil temperature gradient can be divided into rising stage,falling stage and stable stage.The water supply and frost heaving of soil increase linearly with time.The smaller the cooling rate is,the larger the water supply and frost heaveing are.The frost heaving amount of soil is mainly determined by the external moisture migration.

关 键 词：粉质黏土 双层补水层 降温速率 温度梯度 水分迁移 

分 类 号：TU445[建筑科学—岩土工程]