Abstract:
In order to conduct an in-depth research on the disaster causing laws of coal-rock burst and rock burst in deep strata, a multi-functional physical simulation test system for rock burst in deep strata has been independently developed. The system mainly consists of a true triaxial load loading system, a shear loading disturbance system, an oil source and booster system, a specimen production and transportation system, and a test control and data acquisition system. Based on the system developed, an experimental research was conducted on 300 mm × 300 mm × 600 mm sandstone and similar materials. The test results show that the testing experiment proves that the system has good accuracy and stability, and the displacement and force sensor testing accuracy is high, which can complete the true triaxial load test with high quality. The system can complete the impact failure test on the free surface, and the failure effect is intuitive and significant. The phenomenon of roadway damage shows a consistent pattern with the infrared thermal imaging cloud map, and the color of the energy release temperature cloud map in the fractured area is deepened. The overall average infrared radiation temperature gradually increases during the entire stress loading stage, and the temperature increases sharply during the disturbance loading period. When the roadway approaches a complete destruction, the cracks inside the roadway penetrate, causing a large amount of surrounding rock to be thrown out from roadway walls and a sudden increase in acoustic emission counts and energy, while maintaining a high level of energy. The cumulative energy of acoustic emissions increases exponentially. The electromagnetic radiation energy mainly occurs during the rupture period and the comprehensive failure period of the disturbance loading stage. During the comprehensive failure period, there is a significant sharp increase in energy amplitude, which is like acoustic emission energy, verifying the degree of energy release from unstable failure.