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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 characteristics of ice film and the formation mechanism of ice film between silty clay and different media during the freezing process, the uniaxial freezing tester and the low temperature chamber were used to study the characteristics of the ice film in concrete, soil, aluminum soil and stainless steel soil Unidirectional freeze test. Fifteen groups of experiments, which considered different freezing temperature differences, initial water content, dry density and freezing time, were carried out to test the ice film, temperature distribution and moisture migration under unidirectional freezing in a closed system. The test results show that the ice film is produced at the contact between different materials and soil, and the measured thickness of ice film is between 0.30 and 3.40 mm. The ice film density calculated from the measured ice film mass is less than the density of pure ice and is about 0.35 to 0.45 g / cm3. Initial water content, freezing temperature difference, freezing time increases are conducive to the ice film thickness increases, but also promote the increase of water migration. Dry density of water migration has a certain inhibitory effect.