温度梯度下土体变形及水分迁移测试装置

摘要

Temperature change will cause the swell and shrinkage deformation of soil,and moisture migration will cause changes of soil behavior,such as permeability,retention behavior and coupled thermal-hydro-mechanical behavior.Therefore,development of a device,which can simulate the moisture migration and measure the deformation of soil under temperature gradient,is of great practical significance.In this paper,a testing device is developed to study the deformation and moisture migration mechanism of soils under temperature gradient.The testing device includes a sample chamber,a temperature gradient control device,and temperature & moisture content acquisition equipment.The moisture content and temperature of the soil in different locations can be measured in real time by the soil temperature & moisture content acquisition equipment,and the water transport process can be simulated under the temperature gradient.At the same time,the amount of deformations corresponding to different temperature and water contents at different locations can also be measured by this device,and then change of deformation under temperature gradient can be obtained.%温度的变化会引起土体产生胀缩变形,水分迁移进而引起土体渗透特性、土水特性以及热-水-力耦合特性的改变.介绍了一种温度梯度作用下土体变形及水分迁移特性测试装置,用来研究土体在温度梯度作用下的变形规律及水分迁移机制.装置包括试样室、温度梯度控制装置以及温度和含水量采集装置.采用土体水分温度测试装置,同步实时量测土体的含水量和温度,得到土体不同位置处温度及含水量的变化规律,模拟温度梯度作用下土体中水分传输的过程.同时,该方法还可以量测土体不同位置处与不同温度和含水量对应的变形量,得到温度梯度作用下土体的变形规律.