摘要
针对粗粒盐渍土冻胀敏感性与水盐迁移及力学性能变化存在的直接关联性,以强盐渍土地区的察格高速公路为例,选取弱盐渍砾类土为研究样本,利用自制的温控实验设备,在室内模拟冻融循环下粗粒弱盐渍土路基水盐分布及迁移过程,并取含盐量最大的土层进行回弹模量和承载比CBR测定,观察路基冻融聚盐后的力学强度指标变化,实验结果表明,冻融循环后砾类土盐渍土路基水分呈"抛物线形"分布,具有规律性,盐分呈"波浪形"分布,规律性差,水、盐迁移性无明显的对应性,同时,冻融聚盐后路基的E0和CBR值均随之减小,力学性能变差,影响路基承载力。
According to the direct correlation between the frost heaving sensitivity with water and salt migration and mechanical properties changes, taking Qarhan-Golmud highway in strong saline land area as an example, using weak saline gravel soil as the research sample, using the temperature control experiment equipment homemade, the distribution and migration processes of water and salt in coarse grained weak saline soil subgrade under freeze-thaw cycle were simulated, and resilient modulus and bearing ratio CBR of the soil with the maximum salinity were determined, changes of mechanical strength indexes of the subgrade after freeze-thaw cycle were observed. The experimental results showed that the moisture in the coarse grained weak saline soil after freeze-thaw cycle showed ＂parabolic＂ distribution, with good regularity; while the salinity showed wavy distribution, with poor regularity. There was not obvious correspondence in water and salt migration. At the same time, after freeze-thaw cycle, the E0 and CBR values of the subgrade all decreased, and the mechanical properties of the subgrade became worse, which affected the bearing capacity of the subgrade.
作者
张磊
ZHANG Lei(Shaanxi College of Communication Technology,Shaanxi Xi＇an 710018,China)
出处
《当代化工》
CAS
2018年第6期1162-1165,共4页
Contemporary Chemical Industry
关键词
粗颗粒盐渍土
水盐迁移
路基病害
高速公路
Coarse-grained saline soil
Water and salt migration
Subgrade disease
Highway
