Creep behavior of a soft rock in triaxial compression and shear conditions

摘要

Soft rock exhibits pronounced creep deformations even under relatively low stress level. In this study, a series of laboratory tests including triaxial compression creep tests and shear creep tests, were conducted on a soft rock - strong weathered sandstone in order to investigate the creep behaviors. Based on test results, the creep deformations of mudstone are analyzed. In addition, a viscoelastic model - Burgers model was chosen to simulate numerically the creep behavior in triaxial and shear conditions. The parameters identified from triaxial compression creep tests and shear creep tests are compared between different stress levels.