Influence of Strain Rate on the Shearing Properties of Compacted Cohesive Soils

Abstract

In this paper, the results of experiments on the influence of the strain rate e on shearing properties of compacted clay (T-clay) and clayey silt (N-clay) are shown.
The compressive strength (σ₁-σ₃) _f and pore pressure at failure Δu_f increase with an increment in the consolidation pressure σ_3c' but the influence of the strain rate ξ on (σ₁-σ₃) _f and Δu_f is hardly detectable.
The stress path of compacted soils is similar to that of overconsolidated clay.The strain rate ε has an influence on the stress path of T-clay but none on that of N-clay.
The components of cohesion and internal friction on shearing resistance change with strain;namely, the component of cohesion is mainly at small strain and that of internal friction is mainly at large strain but strain rate ε has littl influence on these components.
In conclusion, the strain rate e has little influence on the shearing properties of compacted cohesive soils.