###### Abstract
Under complete stress-strain loading conditions and triaxial creep stress conditions, the change rules for the permeability were found to be mainly dependent on the failure mode of gas-saturated coal and the stage of creep deformation, respectively. The changes in the peak deviatoric stress, lateral expansion ratio, and permeability under different paths were obtained through experiments [16]. Meanwhile, some researchers in recent years have focused on the mechanical and seepage characteristics of coal under cyclic loading [17; 18; 19]. The changes in the damage, deformation, and permeability under different cyclic loading and unloading times and stages were studied. At present, only a few scholars have studied the effects of different loading and unloading rates on the mechanical behavior and permeability of coal and rock [20; 21; 22]. For example, the mechanical response and failure mechanism of coal under different loading rates were studied through experiments. The results showed that both the ultimate failure strength and absorbed energy density before failure increase with the axial loading rate. The deviatoric stress is the cause of the increases in the bearing strength and absorbed energy density, and it is the ultimate cause of failure [20]. Through experiments to determine the effects of the unloading rate on the mechanical behavior and permeability evolution of coal, it was found that a higher unloading rate led to a decrease in the bearing capacity and an increase in the unloading rate made the accumulated energy and dissipation energy decrease. In addition, a higher unloading rate accelerated the rock failure and the increase in the magnitude of the permeability was greater [21]. Based on a new experimental method, [PERSON] [22] showed that with an increase in the initial hydrostatic stress, both the strength and corresponding axial strain at failure increased. In contrast, the strength and strain decrease with an increase in the loading-unloading rate. Moreover, the degree of the failure form was improved with an increase in the loading-unloading rate. Nevertheless, none of these studies considered the effects of accelerated loading and unloading on the failure and seepage characteristics of gas-bearing coal. In on-site production, the advancing rate of the working face is not fixed. The cycle progress and mining efficiency are often improved by increasing the advancing rate, and the advancing rate of the working face shows the tendency to increase. The acceleration of mining at the working face causes the accelerated loading of axial stress, the accelerated unloading of radial stress on coal and rock, or both. The acceleration of the loading and unloading will affect the failure and seepage characteristics of gas-bearing coal. However, whether these effects are related to the occurrence of coal and gas dynamic disasters is still unknown. In summary, the failure and seepage characteristics of gas-bearing coal under deep mining conditions have not been fully studied. In addition, to the best of our knowledge, there have been few reports on the effects of accelerated loading and unloading on the failure and seepage characteristics of gas-bearingcoal. Therefore, it is of great importance to systematically study the failure and seepage characteristics of gas-bearing coal under accelerated loading and unloading conditions, which will play a key role in the prevention and control of coal and gas dynamic disasters. In this work, experimental and theoretical studies were combined. In the experimental study, the mechanical and seepage experiments of gas-bearing coal under two sets of comparative paths were carried out, and the influence law of the accelerated loading and unloading on the failure and seepage characteristics of gas-bearing coal was obtained. Based on the experimental study, a permeability evolution model of gas-bearing coal that considered changes in the loading and unloading rates was established and validated using experimental data.