Study on influence law of mining speed on stope energy releasing

Mining activities are the fundamental causes of strong mine earthquakes and even rockbursts in coal mines. Aiming at the impact mechanism of the mining speed on the release of elastic energy of surrounding rock, through theoretical analysis, numerical simulation, and on-site measurement methods, the influence of mining speed on the release of supporting pressure roof energy in the mining area was theoretically generalized and expounded. The temporal and spatial evolution characteristics of earthquake energy in the mine are simulated, and the effect of mining speed on the energy and frequency distribution of mine earthquakes was calculated. The results show that the faster the mining speed, the greater the total energy and the maximum energy released by the model per unit time; the peak value of the total elastic energy released by the model increases with the number of excavations; it is proved that the energy accumulation degree of the surrounding rock will increase with mining speed and the increase of the number of excavations, and the faster the stoping speed, the higher the proportion of large-energy mine earthquakes in the surrounding rock of the stope. Through the statistical analysis and verification of the seismic energy of surrounding rocks and mines in the actual stope, and according to the change gradient of daily average total energy and daily average frequency of large energy mine earthquake with mining speed, it is determined that the reasonable mining speed range of No.402103 working face is 3.2～4.8 m/d, and the statistical analysis results are applied to the mining intensity optimization of the adjacent working faces, and good results are obtained.