Appliction of hard and stable roof control by means of directional hydraulic fracturing in Fenghuangshan coal mine

According to the existing problems of the hard and stable roof control in coal mine by means of deep hole advance pre-split blasting,the directional hydraulic fracturing was proposed.The field tests were applied in working face XV4306 and XV5302of FengHuangShan coal mine.Based on the surrounding rock geomechanical features of the site,the directional hydraulic fracturing program was determined.And the process was optimized during the field test.The field test results showed that the first weight distance was26～27m after directional hydraulic fracturing.The directional hydraulic fracturing words well,and it provided the basis for the application of the technology.