Soil Creep As A Rate Process

The fundamental equation of the theory of absolute reaction rates has been adapted for use in the study of time-dependent soil deformations. Results of constant stress creep tests have established that the basic form of this equation supports the assumption of a thermally activated creep process, the predicted relationship between experimental activation energy and creep stress, and the predicted stress dependence of creep rate. Some modification of the equation is needed, however, to account for the variation of creep rate with time. Techniques are described for study of deformation mechanisms in soils and test results suggest that interparticle bonding is probably of the primary valence type. Resistance to shear stresses cannot be accounted for in terms of viscous water films, and interparticle contacts must be effectively solid to solid.