Long-term triaxial creep compression tests are conducted on various soil types under varying confining pressures and stress ratios. The creep coefficients of various soil types are determined using a viscoelastic rheological model at non-destructive conditions. A variable compliance model is also used to simulate creep behavior at failure. The strength, deformation characteristics, deformation rate, and time-dependent factors of the soil under various conditions are measured, providing a general basis for predicting the long-term mechanical stability of the soil. The effects of varying confining pressures on soil creep deformation are analyzed to analyze the time-dependent deformation of the soil.

The Triaxial Creep Compression Test instrument consists of three test units, reaction frames, a multi-channel controller, a triaxial measurement and control cabinet, an axial pressure regulating cabinet, an air pump, a pressure chamber, soil sample preparation tools, a computer, and data acquisition software.