Behavior law of pressure on high strength mining face of upper and lower shallow coal seams
For the study of 1-1 and 1-2 coal working face pressure behavior law of Longde Coal Mine with shallow buried depth in process of coordination mining,support pressure monitoring system are used to carry out analysis on the weighting rule.Borehole stress monitoring system and the CT detection technology are adopted to conduct the experimental study of the upper and lower coal seam face stress,and mining face roadway deformation characteristics is studied using drilling peep in-strument and meter roof abscission.Results show that working face of the upper coal seam has a periodic pressure step dis-tance of 10～24.4 m,and the medium pressure strength is 40 MPa.In the lower coal seam,the working face with large min-ing height has a periodic weighting step distance of 7.2～18.8 m and an average weighting strength of 11 230 kN.The aver-age influential range of advanced stress on 2-2 coal face is measured and determined by borehole stress meter as 40.8 m,and the peak stress is 5.3 MPa.CT detection confirmed that there was no significant influence beyond 59.5 m on the ad-vance working face of 2-2 coal seam.Roof borehole peep and separation monitoring confirmed that the mining of the overly-ing 1-1coal seam has no significant influence on the lower 2-2 coal seam.
upper and lower coal seamsco-miningCT detectionmining stressroof abscission
国家科技期刊平台
NSTL
万方数据
维普
