Thanks for your opinion. This time the type of soil is sensitive and at the toe of slide there is debris. When we continue our calculation, is it reasonable to regard debris as undrained materials and just use undrained shear strength (whcih is shown in the paper) and unit weight
I was reading a paper about a landslide around Desbiens on Lac Saint-Jean (name of the paper is The stabilization of a slide in Saint- JCrbme, Lac Saint- Jean).
In the paper, the author used residual shear parameters (effective cohesion and friction angle) to analyze this slide and got 0.95...