Abstract：Research purposes: This paper estimates the residual strength of slip soil to provide Liable strength parame-ters for landslide stability research and control design.
Research methods: Field investigation of landslide, the field and laboratory tests are basic research methods，and theoretical analysis is secondary.
Research results: Residual strength of slip soil has linear regression with peak strength; plastic index can he batter used to estimate residual strength.
Research conclusions: Under condition of ancient landslide revival and certain creep deformation, residual strength can be substituted for shear strength. The field test shows that there has obvious peak strength in curve of shear stress and shear displacement, residual strength appears after certain shear displacement. The strength parameters of laboratory and reverse calculation are consistent, thus it is proved that field laboratory is s good way to estimate residual strength of slip soil.
[1]Anson R W W，Hawkins A B. Analysis of a sample contai- ning a shear surface from a repent landslip, south Cotwolds [J ] .Geotechniqne,l999,49(1):33-41.
2007, Vol. 24 
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