【摘要】 <正>温度梯度影响下冻土中的水分迁移不但改变了冻土的结构构造和冰水比例,而且造成冻土物理力学性质的改变,导致冰分凝和冻胀。该课题的研究无论对于多年冻土区冷生现象的解释还是寒区工程设计都有重要意义。 为了定量评价和预报冻土中的水分迁移量,许多学者曾从理论和试验方面做了大量的工作。更多还原

【Abstract】 Water migration in an unsaturated frozen soil, morin clay, was tested in horizontally closed soil columns under linear temperature gradients. The flux of water migration was calculated from the distribution curves of the total water content before and after testing. Four factors affecting the flux, i. e. temperature, temperature gradient, test duration and the dry density of the soil, were investigated. It was found that the flux is directly proportional to the temperature gradient and inversely proportional to the square root of the test duration, decreases with the decrease in temperature in the power law form,and changes with the dry density. The behavior of water migration in unsaturated frozen Soils is something like that in unsaturated,unfrozen soils.更多还原