Research on roof cutting and roadway protection technology of hard roof in Tonghe Coal Mine
Aiming at the problem of large thickness,hard texture and difficulty falling down of overlying roof strata in No.2 coal seam of Tonghe Coal Mine,the method of pre-splitting blasting was proposed to cut the roof and protect the roadway.By means of theoretical analysis and numerical simulation,the reasonable pre-splitting blasting depth was determined to be 16.6 m,and the angle between the blasting hole and the horizontal direction was 75 °.The field test was carried out on No.2105 Face.The field monitoring results showed that after the pre-splitting blasting of the roof strata of No.2105 track roadway,the problem of large-area hanging roof of the hard roof of No.2105 Face was effectively solved,and the role of roof cutting and pressure relief was played on No.2106 belt roadway.
hard roofpre-splitting blastingroof cutting roadway protection
万方数据
维普
