Stability and deformation problems involving the undrained shear of deposits of saturated clay require determination of one or more of the following parameters: the in situ undrained shear strengths (s ); the effective stress parameters defining the Mohr-Coulomb failure envelope; Skempton's pore pressure para¬meter (A ); and a stress-strain relationship (modulus E or a stress-strain curve). An accurate prediction of these parameters from the results of field and/or laboratory shear tests requires:n1. Testing of samples which have the same properties as the in situ clay;n2. Performance of shear tests which have the same stress system, rate of strain and environment as will be imposed in the field, i.e., measurement of the correct soil parameters.
展开▼
