摘要
结合核磁共振仪，利用自行设计的机械加压装置，包括非金属材料制成的耐压试管，确定了冻土对应不同压力和温度的未冻水含量，并计算了相应压力下冻土的冻结温度．实验温度范围为０～－２０℃，压力范围为０～４０ＭＰａ．结果表明，冻结温度随压力增大而呈线性降低；对应不同温度的未冻水含量随压力的增大而增大．
An installation, including a test tube made of a special material, was designed to determine the unfrozen water content of frozen soil at high pressures using a nuclear magnetic resonance probe. Using this installation, the unfrozen water contents of frozen soil under different pressures were determined, and the freezing point of soil corresponding to various pressures was calculated from the determined unfrozen water contents. The test temperature ranged from 0 to -20℃, and the pressures ranged from 0 to 40 MPa. The experimental results show that the freezing point of soil decreases linearly with increasing pressure and that the unfrozen water content of frozen soil increases with increasing pressure in a non-linear manner. The results show that the soil water has the same characteristics as free water of water and ice equilibrium. The Clapeyron Equation, which describes the phase equilibrium of two ingredients, can be applyto describe the equilibrium between ice and water in the soil at least in the range of the designed pressure. The relationships the freezing point, the unfrozen water content and pressure are analysed.
出处
《冰川冻土》
CSCD
北大核心
1998年第2期124-127,共4页
Journal of Glaciology and Geocryology
基金
国家自然科学基金
