Residual strength characteristic of pure clay mineral prepared under condition of different salinity

If a clay on a slip surface in a landslide has an exchangeable cation e.g. Na montmorillonite, consistency and shear strength of the clay may be changed by the ion concentration of sodium. This paper describes the influence of salinity on peak and residual strengths of kaolin and Na montmorillonite. Ring shear tests were performed on specimen prepared under different concentrations of NaCl solutions. Main conclusions are as follows. Firstly, the consistency limits decreases with increasing the salinity. Secondly, the internal friction angles are almost constant to the change in salinity, whereas the apparent cohesions increase with increasing the salinity.

landslide

residual strength

clay mineral

salinity

consistency

ring shear test