Influence mechanism of mining speed on energy release in a mine roof and elastic coal system

Deep, high-stress, high-strength mining conditions will make the energy release from the mining fields more intensive. The influence mechanism of mining speed on energy release in the mining area was studied using elastic mechanics theory, numerical simulation, and on-site measurement methods. When the average mining speed increases from 3.68 m/d to 5.6 m/d, the cyclic weighting step distance increases from 29.5 m to 38.85 m, indicating that the faster the mining speed, the larger the periodic fracture size of the inferior key strata, and the more energy the bending and sinking static load and dynamic load input into the coal body, the easier to induce rock burst. Based on the curve of mining speed and high-energy mining earthquakes frequency, the critical safe mining speed of Hujiahe Coal Mine is determined to be 4.8 m/d. These conclusions can provide a basis for the mining intensity optimisation in rockburst mines.