Research results:Residual strength of slip soil has linear regression with peak strength; plastic index can be better used to estimate residual strength.
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。
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Furthermore, it is pointed out that the restorations of residual shear strength on time effect are considered on analysis of the parameters of the fossil landslide slip surface.