(1. College of Energy Science and Engineering，Xi?an University of Science and Technology，Xi?an，Shaanxi 710054，China；
2. Key Laboratory of Western Mines and Hazard Prevention of Ministry of Education，Xi?an University of Science and
Technology，Xi?an，Shaanxi，710054，China)
Abstract：The implementation of the existing coal mine rock burst prevention and control measures are closely related to the pressure relief project. Based on the widely recognized rock burst energy theory，it is proposed to use different pressure relief measures to reduce the high stress concentration of rock mass in the impact danger area，effectively avoided the generation of numerous rock burst，but even when the on-site pressure relief work is sufficient，The rock burst still occurs. In addition，the prevention and control of rock burst and the roadway support themselves as a pair of contradictions，which exacerbates the complexity of the theoretical research work . In order to further to refine the rationality of pressure relief measures，the pressure relief measures are transformed from engineering scales to laboratory scale pressure relief measures. In this paper，the static load was applied by uniaxial compression，and the damage evolution law of two commonly used pressure relief methods of coal samples was obtained at the indoor scale，the consistency of the“dual energy”index is analyzed，and a collaborative early warning mechanism is constructed. The test results show that：water injection pressure relief measures can well reduce the impact tendency towards the overall coal sample，while drilling pressure relief measures to increase the impact tendency towards the coal sample，and its main purpose is to artificially guide the energy release. So it needs Determine the adaptive pressure relief measures based on the actual situation；in addition，the“calculated energy”purely through energy theory has a certain unity，and the introduction to the“monitoring energy”indexed that destroys the entire process of acoustic emission，data statistics show that the two have cross-scale consistency. Therefore，based on the above concept，the“dual energy”indexed of the failure process of the loaded coal sample is tried to be introduced into the idea of ''identifying the precursors of the failure of the loaded coal sample，and finally a collaborative early warning mechanism is formed. Among them，the water–pore–fracture coupling medium and the intact coal matrix forms/formed a relatively stable elastic body in the process of water injection and pressure relief，which is manifested by the stable storage of elastic strain energy and the slow increase in dissipated strain energy. In addition，due to the existence of high pore water pressure and water Various synergistic effects such as the lubrication of the coal matrix promote the rapid expansion of pores and cracks，and the dissipation of strain energy quickly rebounds and rises in a short time and quickly breaks. The borehole pressure relief measures all have a stress transfer effect on the loaded coal sample，and the large and small diameters show obvious differences. This puts forward requirements for reasonable drilling parameters on the engineering scale，thereby ensuring a reasonable and effective pressure relief effect.
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2021, Vol. 40 
