Application research on technology of non-pillar gob-side entry retainingformed by roof cutting and pressure release in high gas coal seam

In view of problems of high cost, complex construction technology and slow construction progress existed in traditional gob-side entry retaining technology which mostly adopts method of filling at the side of goaf to protect the roadway, the technology of non-pillar gob-side entry retaining formed by roof cutting and pressure release in high gas coal seam was studied taking 62711 working face in high gas coal seam of Duerping Coal Mine as research object. The technical process of the technology of non-pillar gob-side entry retaining formed by roof cutting and pressure release was analyzed in detail from the aspects of key parameters design of pre-splitting and cutting joints, entry retaining reinforcement and support, gangue retaining support in goaf, gas safety management method, and rock pressure monitoring was carried out on the working face. The analysis results show that application of the technology of non-pillar gob-side entry retaining formed by roof cutting and pressure release in Duerping Coal Mine realizes pressure release effect on the stope, and successfully keep track transportation roadway of 62711 working face as the next adjacent working face belt transportation roadway, which obviously improves coal recovery rate, relieve the tension between coal mining and tunneling, and avoids mine disasters caused by residual coal pillars. In addition, the use of "Y" type ventilation mode effectively solves the problem of gas accumulation in the upper corner of the working face.