An Assessment of the Osmotic Pressure Effect on the Creep Properties of Silty Mudstone

Abstract

The existence of water and osmotic pressure significantly aggravates the rheological behavior of rocks, which greatly affects the long-term stability of rock mass. The triaxial rheological deformation of mudstone under different osmotic pressures was discussed, and a new viscoelastic-plastic rheological constitutive model was proposed. The research shows that the existence of osmotic pressure shortens the time required for the mudstone to reach steady-state creep, reduces the failure-level stress, and makes creep failure occur faster.