Influence of Confining Pressure on Shearing Properties of Compacted Soils Subjected to Creep

On the mechanical properties of compacted soils (VII)

Abstract

The influence of creep and confining pressure on shearing properties of compacted soils at optimum moisture content is shown in this paper.
The shearing strength and Mohr-Coulomb's strength parameters c' and φ are scarcely changed with creep stress.
The initial part of a stress-strain curve of compression test is strongly affected by creep, so the initial tangent modulus of deformation E_it of samples subjected to creep is larger than twice or more that of samples not subjected to creep. But the secant modulus of deformation at failure stress E_sf is scarcely changed with creep. E_it is increased with confining pressure p but E_sf is not always increased with p.
The hyperbolic function of stress-strain relation given by Kondner is only applieable for sandy soil at high confining pressure and for cohesive soil.