Study on Pilot Roof Support Pressure Distribution Law of Coal Mining Face in Dongqu Mine

Due to the pilot roof support pressure of the coal mining face had a direct influences to the mine pressure bumping,the coal and gas outburst and other phenomenon,in combination with the mining conditions of No.14305 coal mining face in Dongqu Mine,the theoretical calculation and the UDEC2D4.0 numerical simulation was applied to study the distribution law of the pilot roof support pressure in the coal mining face.Meanwhile the statistic analysis was conducted on the pilot roof support pressure data measured at the site and the distribution law of the pilot roof support pressure was obtained.The influence scope of the pilot roof support pressure in No.14305 coal mining face was about 35 m,the peak value of the pilot roof support pressure was about 16 MPa,the pilot distance to the coal mining face was 8~10 m and the stress concentration coefficient was about 2.2,which could provide the technical support to the design of the coal pillar height and the face support parameters in Dongqu Mine.