土壤一维热湿传递实验台的研制及模型试验  

Development of Test-bed and Model Test for One-dimensional Heat and Moisture Transfer in Soils

作　　者：曾召田[1,2] 吕海波[1,2] 徐云山[1] 唐双慧 贺海洋[1] 

机构地区：[1]桂林理工大学广西建筑新能源与节能重点实验室,广西桂林541004 [2]广西大学土木建筑工程学院,广西南宁530004

出　　处：《重庆交通大学学报（自然科学版）》2016年第4期75-82,共8页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金资助项目(41502284;51568014);广西自然科学基金资助项目(2013GXNSFBA019233);广西建筑新能源与节能重点实验室资助课题项目(桂科能15-J-21-1)

摘　　要：研制了一个可模拟土壤一维热湿传递的实验台;通过3种土壤的一维热湿传递模型试验,探讨了温度梯度和湿度梯度二者共同影响下土壤的热湿迁移效应,验证了土壤中水分迁移和热量传递的相互作用;在此基础上,对土壤的热湿迁移机理进行了初步分析。研究结果表明:研制的土壤一维热湿传递实验台,具有操作简单、控温精确等优点,能有效模拟温度梯度和湿度梯度二者共同影响下土壤的热湿迁移效应;试验土柱中热量传递十分缓慢,热源附近土壤的温度梯度最大,随着与热源距离的加大,土壤温度迅速降低,冷热端温差越大,温度影响范围越广;相对于土壤初始含水率和土体干密度,冷热端温差是影响试验土柱中温度场最主要的因素;加热后试验土柱的含水率分布曲线可依次分为3个区段,即温差扩散段、共同扩散段和未扰动段;土壤中的热湿迁移过程是一个由多种机制驱动、多相多组分相互耦合作用的复杂过程。The test-bed was developed for simulating soil one-dimensional heat and moisture transfer process. Then, the soil heat and moisture effect under the impact of temperature gradient and moisture gradient was discussed, and the interaction between moisture migration and heat transfer was verified. On these bases, the deep analysis of soil heat and moisture transfer mechanism was presented. The results are shown ： The developed test-bed has the properties of simple operation and ac- curate temperature controlling, which can be effectively used for simulating soil one-dimensional heat and moisture transfer effect. The rate of heat transfer is very slow in testing soil column and the soil near the heat source has the maximum temperature gradient; with distance from heat source increasing, the soil temperature decreases rapidly; the temperature influence range is wider with the larger temperature difference between the hot and cold sides. Compared with initial water content and dry density of soil, ＂the temperature difference between the hot and cold sides is the main factor of affecting the temperature field in testing soil column. After being heated, the water content distribution curve of testing soil column is in turn divided into three segments that is temperature difference diffuser, common diffuser and undisturbed segment. The heat and moisture transfer is a complex process which is driven by multiple mechanisms with coupling of muhiphase and multi-component.

关 键 词：岩土工程 热湿迁移效应 水分迁移 热量传递 模型试验 多相耦合 

分 类 号：TU443[建筑科学—岩土工程]