drained and undrained poissons ratio


In Cyclic triaxial Testing for estimating the Shear Modulus G = E/2*(1+v). If it is undrained (ASTMD3999) v=0.5. If it is drained case...what is the poisson's ratio (v)...?????? How to calculate shear strain and shear stress for drained and undrained conditions...??? Please help me out...

Geotechnical Investigations & In-Situ Testing Soil Mechanics / Geotechnical