Study On The Effect Of Hard Roof Of Rockburst

Rockburst is one of the major natural disasters in coal mine, with the miningdepth increasing, rock burst on many of mine safety in production of our countryposesa direct threat. In this paper, through the analysis of the present situationof domesticand international impact ground pressure, and combined with the actual situation of amine in West Beijing, starting from the mechanism of rock burst, recognizingthe impact pressure is the stress superposition results,therefore, in the underground isseen in the form of points, this also shows that the impact ground pressuretreatment becomes to find high stress region the problem. The hard and thicksandstone roof to the accumulation of elastic energy, in hard roof breaking or slippingfailure process, a sudden release ofelastic energy, occurrence of roof rock burst.In this paper, through theoretical analysis, field investigation, similar materialsimulation and other means of West Beijing mine rockburst lots of research,study hardroof breaking effect on roadway surrounding rock near the plastic zone and stressconcentration point, to find the relationship between the hard roof and rock burst.Through the research present condition of hard roof rock burst occurrence"pole"effect, the hard roof breaking energy change off process and makes a systematicanalysis of stress variation, and through laboratory simulation study found the factorsthat influence the hard roof breaking.