正冻粉质粘土与介质间冰膜形成机理的试验研究  

Experimental Research on the Formation Mechanism of Ice Film between Freezing Silty Clay and Different Mediums

作　　者：何菲[1] 王旭[1] 蒋代军[1] 刘德仁[1] 

机构地区：[1]兰州交通大学土木工程学院,兰州730070

出　　处：《地下空间与工程学报》2016年第3期698-704,共7页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金(51268033);长江学者和创新团队发展计划项目(IRT1139)

摘　　要：为研究冻结过程中粉质粘土与不同介质间的冰膜特性及冰膜的形成机理,本文采用单向冻结试验仪及低温试验箱,对混凝土-土、铝-土、不锈钢-土进行了室内单向冻结试验。试验进行考虑了不同冻结温度差、初始含水量、干密度、冻结时间等因素下的15组试验工作,测试了试验在封闭系统中单向冻结条件下的冰膜、温度分布及水分迁移特性。试验结果表明,不同材料与土接触处有冰膜产生,冰膜的实测厚度在0.30~3.40 mm之间,由实测冰膜质量计算得到的冰膜密度小于纯冰的密度,约为0.35~0.45 g/cm3。初始含水量、冻结温度差、冻结时间的增大均有助于冰膜厚度的增大,也可促使水分迁移量的增大。干密度对水分迁移具有一定的抑制作用。In order to study the physical properties and the formation mechanism of ice film between silty clay and different mediums,indoor unidirectional freezing experiments of concrete-soil,aluminum-soil and stainless steelsoil were carried out by using unidirectional freezing moisture migration tester and low temperature test chamber. Fifteen groups of test work were conducted under different boundary conditions,including different freezing temperature differences,initial water contents,dry densities and freezing times. The properties of ice films,characteristics of temperature distribution and the moisture migration regularities of soil samples were measured in a closed system. The test results show that ice films will be formed on the contact surface between different materials and soil in the freezing process. The measured thicknesses of ice films change from 0.30 to 0.34 mm. The density of ice films calculated from the measured data is about 0.35 ~ 0.45 g / cm3,which is less than the pure ice＇s. The increase of initial water content,freezing temperature difference and freezing time all contribute to the increasing of ice films＇ thickness,which can also increase the amount of the moisture migration. Dry densities have a certain inhibiting effect on moisture migration.

关 键 词：粉质粘土 冻结 冰膜 水分迁移 试验研究 

分 类 号：TU445[建筑科学—岩土工程]