Analysis on mine pressure bump of near vertical ultra thick seam with upper layer mining and lower layer excavation

in order to detemine the mine pressure bump danger and the rational mining and drving safetydistance during upper layer mining and lower layer excavation periodof the single coal mining face in the near vericalulra thick seam of injiang Wudong Maine ,a study vas conducted ith the numericalsfnulation,the microseismic monitoring and measuring and the sie pracices alysis method.Based on the numericalsinulation method.the studly was conduced on the stress evoludton law and infuence scope under the different same directionaldistance during upper layer mining and lower layer excavation perod of the coal mining face.Accoding o te case analysis on the micro seismic monitoring and measuring and the site pressure bump,a study was condiucted on the relationshtp betwen upr ayer ming andower layer excavation and the mine pressure bunp danger The resuts showed tat the same drecion distance between upper layer mining and lower layer excavationwas in a postive relationship to the seam stress concentration and the micro seismic accidents ocured. Under the coniton.the min safet distance of upperlayer mimng and lower layer excavation in a same direction was 100 m.The seam high stress concentration and the surrounding rock serious activties occured by upper layer mning and lower layer excavation operations was the cause to occur the mine pressure bunp behavior of the lower drvin fce. With the on time measure to stoa the lower layer excavation,the mine pressure bump disaster of the driving gateway could be successtilly avoided and the analysis results were verified.