This article use fuzzy mathematics to appraise 4 indexs include expansion force, free expansion ration, liquid limit, plastic limit and establish a fuzzy method to judge the swell-shrink grade.
本文运用模糊数学的方法对膨胀土的膨胀力、自由膨胀率、液限、塑性指数4项指标综合评价，建立模糊识别分类方法。
It was shown that the organic content, the specific weight of soil particle and the liquid limit decreased but the plastic limit increased with the increase of the concentration of acid.
试验表明：酸浓度的增加导致有机含量减小，土粒比重减小，塑限增大、液限减小；
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