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改变边界温度和土样高度,对饱和粉土进行了冻结试验,研究其水分迁移、水分重分布、冻胀和冰透镜体的发展规律。试验结果表明:当温度稳定时,水分持续迁移到冻结锋面附近,含水率急剧增大,易形成冰透镜体。饱和粉土冰透镜体几何形态较为规则,无枝状交叉结构,已冻土为整体状且无网状裂隙。冻结过程中存在起始冻胀时间,在起始冻胀时间之前,土中水分被排出,冻胀发生之后水分补给到冻土中,且补给水分产生的冻胀量和总冻胀量数值接近。土样高度影响水分迁移量和冻胀量,土样越高,冻胀量越小,冻土含水率增量越小,但水分增量分布区域越分散,且起始冻胀时间越长。
By changing the boundary temperature and the height of the soil sample, the saturated silt was frozen and the law of moisture migration, water redistribution, frost heave and ice lens were studied. The experimental results show that when the temperature is stable, the moisture continuously migrates to the vicinity of the frost front, and the water content increases sharply, making it easy to form an ice lens body. Saturated silt ice lens geometry is more regular, no dendritic cross structure, frozen soil as a whole and without net-like cracks. The initial frost heaving time exists in the freezing process. Before the initial frost heaving time, the water in the soil is discharged. After the frost heaving occurs, the moisture is supplied to the frozen soil. The frost heaving volume and the total frost heaving volume produced by the replenishment moisture are close . The height of soil samples affected the amount of water migration and frost heaving. The higher the soil samples, the smaller the amount of frost heaving, the smaller the increment of moisture content of frozen soil, but the more dispersed the water increment distribution area and the longer the initial frost heaving time.