Research on prevention and control of rock burst in the roadway under the overlying coal pillar in the near vertical coal seam
Taking the problem of rock burst encountered during the excavation process under the protective coal pillar of the near verti-cal thick coal seam final mining line as the engineering background,the changes in the degree of rock burst hazard during the mining of the excavation face under the protective coal pillar by means of numerical simulation,theoretical analysis and field practice were stud-ied,and the corresponding prevention and control means and inspection measures were put forwards,and the following conclusions were drawn,the roadway excavation affected the stress state in the coal pillar area,increasing the scope of the stress concentration zone in the terminal line coal pillar area and the impact hazard;when the excavation face passed through the stress concentration zone at the edge of the coal pillar,the stress peak in front was larger and the rock burst hazard of the surrounding rock was higher.According to the PDCA management mode,a double-cycle mode control model of theoretical analysis,implementation of pressure relief,effect verification,exca-vation practice,optimization and adjustment,effect verification was proposed.Through the implementation of systematic prevention and control projects such as intensive large-aperture pressure relief holes facing the head and all-round high-pressure water injection and sof-tening,and the use of microseismic,ground sound,electromagnetic radiation and other technologies for effect verification,the excavation face passed through the coal pillar rock burst area safely.This provides a reference for the prevention and control of mine rockburst.
near vertical coal seamrock burstprotective coal pillarroadway excavationanti-impact practice
NETL
NSTL
万方数据
