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摘要
To study the characteristics of water and salt migration in the process of freezing and thawing cycles for the saline soil of Nong'an, Western Jinlin Province, physicochemical tests in laboratory and indoor experiments of water and salt migration is carried out with the equipment "Rock & Soil Freezing Thaw Trial and Error Imitating Comprehensive Experimental Platform with Ultra Cold Condition" invented by Jilin University. The remolded soil samples had the same size, initial water content, initial salt content, compaction degree, and temperature. These samples were used to investigate the characteristics of water and salt migration at different times of the freezing and thawing cycle. The water and salt contents at different positions of the soil specimens are tested for comparison with the initial data of water and salt contents. The variation characteristics of the pores are analyzed based on mercury intrusion porosimetry. The freezing and thawing cycles in an open system increases macropore content but decreases the mesopore content, thereby resulting in a layer of water and salt accumulation. The unidirectional freezing results in upward migration of water to the frozen zone, and the unidirectional thawing results in water migration from the ends to the middle part. The water and salt contents at different positions increase with increasing times of freezing and thawing cycles.
- 出版日期2018
- 单位吉林大学; 长春工程学院
