封闭系统条件下粉细砂水盐迁移及变形分析

Water-Salt Migration and Deformation Analysis of Silty Fine Sand under Closed System Conditions

摘要: 在西北地区广泛分布的冻土及盐渍土中，作为铁路路基C类填料的粉细砂在冻融方面少有研究，本文结合阿拉尔市的实际情况，采用粉细砂为研究对象，进行多次冻融循环后水盐迁移及变形试验研究。结果表明，冻融循环过程中，越靠近冷端，温度变化越剧烈，水盐也向冷端迁移，越靠近顶部水，盐聚集越多；粉细砂素土在冻融循环中变形为融沉，而盐渍土变形为先盐胀后融沉，素土与盐渍土累积变形均表现为沉降的趋势。

Abstract: In the northwest region widely distributed frozen soil and saline soil, as railway subgrade class C filler, there is little research on the freeze-thawing aspects of silty fine sand. In this paper, combined with the actual situation of Aral City, silty fine sand was used as the research object to carry out experimental research on the water-salt migration and deformation after several freeze-thaw cycles. The results show that during the freeze-thaw cycle, the closer to the cold end, the more severe the temperature changes, the water salt also migrates to the cold end, and the closer to the top, the more water salt accumulates. In the freeze-thaw cycle, the silty fine sand was deformed into thaw sedimentation, while the saline soil was deformed by salt expansion and then thaws sedimentation, and the cumulative deformation of the prime soil and the saline soil showed a tendency of settlement.