关键词: 砂壤土, 粘土, 冻结, 地下水, 水分迁移

Abstract: Sandy silt and silty clay with the dry density of 1.38-1.40 g/cm³ were packed in the steel cylinders. The cylinders were open at the top and sealed at the bottom and buried into ground. The soil columns in the cylinders had a water supply with constant groundwater tables and were freezing under the natural conditions. The field observations lasted 5 years. It was found that the total amount of water intake flow during freezing was lowest and highest in the sandy silt when the depth of groundwater table was 1.0 and 2.0 m, respectively, and was highest in the silty clay when the depth of groundwater table was 1.5 m. The curve of the water intake flux vs. the elapsed time of freezing had a peak value. With the increase in depth of groundwater table, the time when the peak value occured was delayed. The relationships between the water intake flux during freezing and the elapsed time and between the water intake flux during freezing and the freezing rate could be expressed in the exponential form.

Key words: clay, freezing, grondwater, silt, water migration