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The watr tabble is 9' below the surface wthin a sandy gravel layer 30' thick. the sandy gravel layer overlays a 15' thick clay layer. Sandy gravel (Dray Unit weight=110pcf, n=0.40 Gs=2.65 Clay(saturated Unit weight=112pcf) C'(cohesion)=3.5psi phi(angle internal Friction)=27 The shear...

I'm confused in calculating the effective vertical stress in a sandy gravel soil layer below the graound water level and it is between a sand layer on the top and a clay layer on the bottom. What unit weight i have to consider the sand unit waight or I need the porosity(n)of the sandy gravel to...