Study on Progressive Damage and Failure of Sandstone Samples subjected to Cyclic Disturbance Loads using a Modified Triaxial Test System

Modelling Progressive Damage and Failure of Rock under Continuous Cyclic Loading with an Innovative Computing Tool

“…At the amplitudes of 2.5 MPa and 5.0 MPa, the numerical samples fail by modes of cataclasis. Therefore, the simulated failure modes, to some extent, have similar characteristics to the failure modes obtained from the cyclic loading-unloading experiments (Chen et al 2019).…”

“…The reliability of the developed computing tool for simulating progressive damage and failure of rock subjected to cyclic loading requires verification. Therefore, we set forth to numerically replicate the results of fatigue failure tests on red sandstone specimens obtained by Chen et al (2019). According to the experimental method, red sandstone specimens were placed in a modified rock mechanical triaxial test system to withstand a specific amount of cyclic loading with different frequencies and different amplitudes.…”

“…Figure 9 illustrates numerical results of stress, AE counts, accumulated EER during progressive damage and failure of rock samples subjected to cyclic loading with the three different amplitude levels (1.0, 2.5, and 5.0 MPa). In the experiment reported by Chen et al (2019), the loading process was divided into quasi-static loading phase and disturbance loading phase. The loading strategy in the numerical simulation follows the same method of the experiment, that is, the first 10 loading steps are monotonically static loading and the rest loading steps are cyclic loading.…”

Experimental study of the influence of structural planes on the mechanical properties of sandstone specimens under cyclic dynamic disturbance

“…To verify the rationality of the elastic-plastic constitutive model of rock with a structural plane established, a cyclic addition-unloading constitutive model of rock is established by using the least squares method of origin nonlinear (8) fitting, and fitting is realized by regression and inversion. Taking the working condition (θ = 15°, Δσ = 6 MPa) as an example, the experimental data at 1, 10, 20, 50, and 75 cycles are compared with the theoretical fitting curve, as shown in Figure 17.…”

“…constitutive model, cyclic dynamic disturbance, mechanical property, rock, structural plane, uniaxial compression test of the International Society for Rock Mechanics, 7,8 there are hundreds of deep mines with mining depths over 1000 m in production or being constructed in China (see Table 1). 9 Specifically, in the open-pit combined mining environment, rock slopes are not under monotonic loading conditions but may experience the combined action of open-pit mining and underground mining.…”