煤体吸附解吸瓦斯过程中声发射特征实验研究

In order to study the characteristics of acoustic emission generated in coal during gas sorption-desorption processes, the experimental system for monitoring the acoustic emission generated in coal during gas sorption-desorption processes is designed, and acoustic emission signals are tested under different gas pressures. The experimental results show that acoustic emission signals generated in coal during the gas adsorption process gradually attenuate with the increase of adsorption time, and the process is not continuous. The intensity of acoustic emission signals generated during gas desorption process is far smaller than that during adsorption process, and it remains stable by and large. For the same coal sample, during cycles of sorption-desorption, acoustic emission signals generated during gas adsorption process in coal have memory effect on the maximum gas pressure in earlier stage.