Abstract:

Triaxial creep experiments of a kind of claystone under pore pressure were performed with a triaxial creep testing device which has the system of pore pressure. The effects of axial stress σ₁ and confining pressure σ₃ on the creep, and the pore pressure p were investigated. By creep experiments with different stress states and analyzing the results of different pore pressures, it was found that for constant axial stress and constant confining pressure, with the increase of pore pressure, the deformation amount of creep was reduced, the steadystate creep strain rate was decreased, and the threestate of creep time became longer. The creep behavior of claystone was analyzed with a classic creep model.

Key words: pore pressure; claystone; triaxial creep experiments; creep