DERIVATIVE OF STRESS ? STRAIN, DEVIATORIC STRESS AND UNDRAINED COHESION MODELS BASED ON SOIL MODULUS OF COHESIVE SOILS

The deviatoric stress-strain, derivative of deviatoric stress-strain, and derivative of ratio of deviator stress to undrained cohesion behaviour of soils on three areas within Port Harcourt were carried out and their deformation trends established. The soils exhibited a nonlinear stress-strain deformation behaviour and the predicted soil modulus for the areas are generally in the range of E applicable for routine work in London clay; soils within Agip and Iriebe are identified as medium clay, except for UST soils that are within the range of medium to stiff clays. Stability magnitude of the soils increased in the order of Iriebe, Agip and UST soils, while deformation of soils response to loading were in decreasing order of Iriebe, Agip and UST soils.