The mechanical properties and a fatigue-damage model for jointed rock masses subjected to dynamic cyclical loading

Fatigue properties of intact sandstone samples subjected to dynamic uniaxial cyclical loading

“…From the reported literature, it was found that intact [3][4][5][6][7][8][9][10][11][12][13][14][15][16] and failed models of jointed rock [17][18][19][20] were extremely susceptible to cyclic fatigue failure. Some have also studied the dynamic damage properties of nonjointed intact samples [21][22][23][24][25].…”

“…In their recent publications, Li et al [19,20] studied the mechanical properties and presented a fatiguedamage model for jointed rock masses and dry, frozen, and saturated sandstone samples with intermittent cracks subjected to dynamic cyclical loading. Li et al [19] reported laboratory studies conducted on gypsum samples with man-made intermittent joints under dynamic loading mode with frequencies of 0.2, 2, and 21 Hz.…”

“…Li et al [19] reported laboratory studies conducted on gypsum samples with man-made intermittent joints under dynamic loading mode with frequencies of 0.2, 2, and 21 Hz. They drew the following conclusions:…”

Fatigue damage variable and evolution of rock subjected to cyclic loading

“…Both bowknot angle and dissipative angle enhanced as the area of hysteresis loop increased, and attenuation enhanced as viscosity coefficient of pore fluid increased. In terms of the fatigue deformation, Li et al [10] stated that the dynamic deformation increased with the joint density and decreased with the joint angle. Ge et al [11][12][13] found that the terminal strain of fatigue failure was equal to that of post-peak corresponding to the maximal cyclic load.…”

A Damage Constitutive Model for Rock Mass with Nonpersistently Closed Joints Under Uniaxial Compression

“…Many scholars have done many works on it. For instance, Li et al [23] obtained the calculation method of the damage tensor of the rock mass with nonpersistent joints based on the strain energy theory, which perfectly considers the joint geometrical and mechanical properties at the same time. It provides a good idea for studying the damage model for the rock mass with nonpersistent joints.…”