Effect of Strain Rate on the Mechanical Properties of Marine Soft Soil in Tianjin

Consolidation undrained triaxial shear test of marine soft soil of Tianjin Binhai test specimen under different confining pressure and different strain rate was conducted by using WF stress path triaxial instrument. And the influence on marine soft soil's stress-strain relationship, effective stress and fracture morphology was analyzed based on different strain rates. The results showed that the CU experiment's stress-strain relationship had hardening characteristics and that the peak shear stress increased with the increase of strain rate while pore water press decreased. Under the same consolidation pressure, strain rate had little effect on effective stress path. Therefore the effective stress path of normal consolidated clay was unique. The strain rate influenced the total stress strength whose internal frictional angle increased with the increase of strain rate.