ABSTRACT
Taking the roof of the 42106 working faces of the 4–2 coal seam of Bultai as the research object, this paper adopts numerical calculation and theoretical calculation to establish the mining fracture instability model of the hard roof. It discusses the evolution characteristics of dynamic impact stress response and the dynamic load effect characteristics of coal seam roofs at different levels of height. Finally, it summarizes the dynamic impact response law of the roof of the comprehensive surface. The results show that the dynamic load shock response is a complex vibration response process in the coal rock mass. The dynamic load effect of the comprehensive discharge face is jointly analyzed by studying the stress state, displacement, and acceleration of the surrounding rock of the coal seam. Finally, the scope of the core area of dynamic load propagation and the reasonable mining and discharge ratio under this geological condition are determined. The research results provide a theoretical basis for the stability control of the roof of the coal seam under the influence of dynamic load disturbance in the shallow buried thick coal seam.
