研究结果：滑带土的峰值强度和残余强度比较接近，成线性关系；塑性指数能较好的用来估算残余强度。
Research results:Residual strength of slip soil has linear regression with peak strength; plastic index can be better used to estimate residual strength.
指出了地基承载力与塑性指数的关系，探讨了黄土地基工程分类。
The relationship between foundation bearing capacity and plasticity indexes is pointed out, and discusses loess foundations engineering classification.
试验结果表明：1）相比于未改性土，粉煤灰改性土和石灰改性土自由膨胀率、塑性指数、胶粒含量都显著降低；
The test results indicate that: 1) Compared with unmodified soils, the free swelling ratio, plastic index and clay fraction of fly ash-treated soils and Lime-treated soils decrease obviously.
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