针对膨胀土胀缩等级分类问题,构造了一种新的区间关联函数,提出了“分类特征体现度越大,权重越大”的权重计算原理,给出了一种新的变权计算方法,将单指标关联函数的最大值作为其评价类的靶心坐标,根据样本与靶心的贴近度,对样本进行分类.将该方法应用于膨胀土的胀缩等级分类,其合理性和有效性得到了验证. Aiming at the problem of classification of expansion and contraction of expansive soil, a new interval correlation function is constructed. The principle of weight calculation is proposed, in which “the greater the degree of classification characteristic is, the greater the weight is,” a new variable weight calculation In this method, the maximum value of the single-index correlation function is used as the bull’s-eye coordinate of the evaluation class, and the samples are classified according to the closeness between the sample and the bull’s eye. The method is applied to the expansion and contraction classification of expansive soils, and its rationality and validity Got verified