关键词: 岩爆, 梯度应力, 声发射特性, 梯度荷载

Abstract: Rockburst is common geological disaster phenomenon in deep underground rock excavation,and stress gradients is one of the main factors affecting rockburst of rock mass inoculation processes.In order to investigate the influences of stress gradient on acoustic emission characteristics during rockburst inoculation processes,the indoor rockburst loading and unloading tests under the effects of different gradient stresses on largesized specimens are conducted by YBA rockburst simu lation test device,the AE monitoring data is obtained in the process of rockbursts by using AE monitoring devices and relevant data analysis is carried out.The study results show that when the specimen is loaded by gradient stress and the confining pressure is constant,the smaller the stress gradient difference on the top,the relatively earlier generation the acoustic emission phenomenon,the release frequency of AE energy is more uniform during the loading process and the value is relatively small.As the gradient difference on the top of the specimen increases,the more frequently the peak AE energy is released,the range of ring count is increased,and the more consistent with the four deformation stages of rock mass compression.

Key words: rockburst,gradient stress,acoustic emission characteristic,gradient load