摘要
盐渍土作为一种环境敏感性特殊土,它所包含的水分、盐分会随着外界环境的变化而变化。在对罗布泊地区天然盐渍土进行多次冻融循环盐胀—冻胀试验基础上,探究其水、盐迁移规律。研究发现:在整个冻融循环过程中,冻融作用导致不同埋深土样中的水分与盐分垂直向运移,总体上自下而上向冷端迁移,冷端层含水量增加最为明显,且保持"盐随水走"的迁移规律。长期如此将造成路基表层含盐量聚集,严重影响道路工程的稳定性。
Saline soil as a kind of special environmental sensitive soil which contains water and salt can change with the change of external environment. In Lop Nur area the natural saline soils are systematically studied by using the salt-frost heave tests with multiple freeze-thaw cycles to explore the water and salt migration laws. The study finds that： in the whole process of freezing and thawing cycles,the freeze-thaw action leads to the sample moisture and salt in different embedded depth vertical migration,on the whole,from the bottom up to the cold side migration,the most pronounced increase of cold end layer water content occurs,and it keeps the patterns of the salt migration with the water,which will cause the salinity accumulation of the subgrade surface and seriously affect the stability of road engineering.
出处
《工程勘察》
2016年第4期1-4,10,共5页
Geotechnical Investigation & Surveying
基金
国家自然科学基金(41262012)
新疆水文学及水资源重点学科基金(xjswszyzdxk20101202)
关键词
罗布泊地区
天然盐渍土
冻融循环
水分盐分迁移
Lop Nur area
natural saline soil
freezing-thawing cycles
water and salt migration
