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易溶盐在土中的存在及其在土冻结过程中的重新分布,对冻土物理化学性质和力学性质及土的冻结过程有重要影响。泰斯等(Tice,et al.)用兰州黄土和阿拉斯加粉土等作对比试验,证明在颗粒成分大致相同的情况下,冻结盐渍土中未冻水含量高于非盐渍土中未冻水含量。张伯伦(1983)的试验表明,对同一种土,增加其易溶盐含量可以减小土的冻胀量、总含冰量及冰透镜体的体积。至于冻结过程中盐分迁移的方向,可有不同情况。邱国庆等的实验表明,在水溶液单向冻结时,盐分向未冻溶液迁移,溶液原始浓度越大、冻结速度越大,则盐分的相对迁移量越小。奥斯托坎等(Oster-
The presence of soluble salts in soil and its redistribution during soil freezing have important effects on the physical and chemical properties of frozen soil, mechanical properties, and the freezing process of soil. Tice et al. (Tice, et al.) used Lanzhou loess and Alaska silt soil as comparative tests to prove that when the grain composition is approximately the same, the content of unfrozen water in frozen saline soil is higher than that in non-saline soil. Water content. Chamberlain (1983) showed that for the same soil, increasing its soluble salt content can reduce the amount of soil frost heave, total ice content, and the volume of the ice lens. As for the direction of salt migration during the freeze, there may be different situations. The experiments of Qiu Guoqing et al. showed that when the aqueous solution was unidirectionally frozen, the salt migrated to the unfrozen solution. The greater the original concentration of the solution and the faster the freezing rate, the smaller the relative migration of salt. Oster-