Investigation of the mechanism and application of pressure relief roadway in preventing rock burst.

As a novel method of preventing rock burst, pressure relief roadway has been proposed in recent years. A longwall face of a coal mine in China was taken as the engineering research background to analyze the anti-shock mechanism and comprehensive prevention technology of relief roadway. Firstly, this paper analyzes the anti-impact mechanism before and after the layout of pressure relief roadway through theoretical and numerical methods. Then, comprehensive prevention and control technical schemes such as active pre-cracking measures for hard roof, high-strength depressurization measures for coal body, multi-layer support system for surrounding rock and strong support for roadway with advanced support are put forward. The results show that after the implementation of the comprehensive prevention and control technology, the seismicity shows stable fluctuation characteristics, the daily energy release is reduced by 80.8%, the large energy events are reduced by 90% on average, and no large energy events over 10J have occurred. The observed stopping wall deformation of surrounding rock is reduced by 25%, roof subsidence by 90.3%, and floor heave by 77.9%. There are only two weak impact danger areas on the working face of vibration wave active CT detection, and the remaining 75% area is no impact danger area.