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本文针对膨胀土的判别分类指标存在的一些问题，提出一种新指标──风干含水量Ｗ_（６５）。文中详细研究了它的测试方法，它与膨胀土的物理化学活性，物性指标及自由膨胀率δ_（ｅｆ）等的关系。结果表明，Ｗ_（６５）能很好反映膨胀土的矿物组成或物理化学活性特征，而δ_（ｅｆ）或Ｗ_Ｌ则更能反映土的粒度组成或分散性特征。最后，在继承δ_（ｅｆ）的判别分类成果基础上，考虑到塑性图的优点，建议采用Ｗ_（６５）─Ｗ_Ｌ判别分类图。该图能区分膨胀土与典型红粘土，较单一指标判分膨胀土更合理适用。
In this paper, aiming at some problems existing in the discriminant index of expansive soils, a new index, air dry moisture W_ (65), is proposed. In this paper, its testing method is studied in detail. It is related to the physico-chemical activity, physical property index and free expansion δδ (ef) of expansive soil. The results show that W_ (65) can well reflect the mineral composition or physico-chemical characteristics of expansive soils, while δ_ (ef) or W_L can better reflect the characteristics of soil particle size distribution or dispersion. Finally, on the basis of inheriting the result of discriminant classification of δ_ (ef), considering the advantages of plasticity graph, it is recommended to use the W_ (65) - W_L discriminant classification graph. The figure can distinguish between expansive soil and typical red clay, which is more reasonable and applicable than single index expansive soil.