关键词: 关键字：底板冲击, 真三轴压缩, 四体构件, Flac3D数值试验, 中间主应力系数

Abstract:

Abstract: To study the characteristics on rock burst occurring from floor in deep underground engineering, four-body component was adopted to simulate coal and rock mass structure. This paper used Flac3D numerical simulation software to imitate component true triaxial compression test. And deep mining environment was simulated by different intermediate principal stress parameter and unloading path. In view of the tectonic stress and energy, the related characteristics of rock burst occurring from floor in deep mining were analyzed. The results indicated that, compared with unloading stress from middle principal stress direction, it was more advisable to unload stress from the smallest principal stress direction because it experienced for longer periods of time from unload stress to the rock burst happened. Then the time step which was from unloading stress to rock burst happened and intermediate principal stress parameter was exponential relationship. In addition, when unloading the smallest principal stress, the time step was exponential rising with the increasing in intermediate principal stress parameter, while the result was contrary to unloading the middle principal stress. And the rock mass that occurred rock burst was experienced processes as brittleness, ductility, brittleness and plasticity.

Key words: Key words: rock burst occurring from floor, true triaxial compression, four-body component, Flac3D numerical experimentation, intermediate principal stress parameter