An improved nonlinear creep model of rock considering the effect of confining pressure on accelerated creep characteristics

Nonlinear creep constitutive model of sandstone under stepped cyclic-constant loading

Study on viscoelastic-plastic creep model of rock based on creep parameter degradation

Establishing a reasonable rock creep model is of great significance for analyzing the creep characteristics of rock and predicting the long-term stability of engineering rock mass. Based on the analysis of the nonlinear creep characteristics of rock, this paper innovatively proposes an unsteady Kelvin body that reflect...

Study on the Fractional‐Order Creep Constitutive Model of Rock Considering Chemical–Stress–Seepage Damage

Accurate characterization of rock creep under coupled chemical–stress–seepage conditions is essential for deep rock stability. A three‐dimensional fractional‐order creep constitutive model is developed. Chemical, stress, and seepage damage are quantified by elastic modulus degradation, the Kachanov evolution, and p...

Identification of the length scale parameter of simplified strain gradient elasticity from standard Mode I fracture tests

Recently, it was shown that additional material constants of strain gradient elasticity (SGE) can be identified for brittle and quasi-brittle materials based on the analysis of experimental data on the crack size effect. In the present paper, we perform precise numerical simulations within SGE and derive regression rel...

Study on the Interaction Between Surrounding Rock and Support in High-Stress Soft Rock Roadways Based on Rock Rheological Properties

High-stress soft rock roadways in deep underground engineering often exhibit significant time-dependent deformation due to strong rheological behavior of surrounding rock. To investigate the deformation characteristics and support effect, a composite viscoelastic constitutive model considering anchored and unanchored r...

Study on creep deformation behavior and constitutive model of filled fractured sandstone under freeze-thaw cycles

The time-dependent deformation and stability of fractured rock in seasonally frozen regions constitute a key scientific issue for engineering safety. To investigate the long-term deformation of fractured rock under the coupling of freeze-thaw (F-T) cycles and sustained loading, this study systematically examined the ef...