Thanks for the reply.
AS you said the only thing known is FOS>1.0.
If it has failed, parameters could be back calculated.
However, to estimate what margin FOS is higher needs some
experience I suppose. If it is say, 1.1, is it
possible the slope to show some distress, say
some creep movement...
A steep embankment (about 38deg and 23m high) made of sand + sandstone spalls is to be assessed for stability. EFCP and boring indicated initial medium dense sand+cobbles up to 5m and then dense with sandstone boulders. In theory material is cohesionless, but there seems to be apprent cohesion...
