Time-Dependent Deformation and Long-Term Strength of Carbonaceous Mudstone under Dry and Wet Cycles

Clarifying the time-dependent strength deterioration characteristics of carbonaceous mudstone under dry and wet cycles is great significance to design expressway cut slopes. In this work, we conducted triaxial compression creep tests on specimens that had undergone different numbers investigate their properties. A function was established between steady-state viscoplastic rate axial compression. The threshold stress assumed as long-term strength, law studied. results showed transient strain, viscoelastic creep, increased with number cycles, failure elasticity modulus decreased. Based method, after n (n = 0, 3, 6, 9) found be 74.25%, 64.88%, 57.56%, 53.16% its uniaxial respectively. Compared isochronous curve method transition can more accurately determine rock strength. decays exponentially, decay during first three about 215 times average rate.