Technological practice of gob-side entry retaining of fully mechanized working face in No.1 shaft of Checun Coal Mine
In order to improve coal mining rate and realize fully green mining,the successful experiences of nearby coal mines are introduced to No.1 shaft of Checun Coal Mine,and the technical practice of gob-side entry retaining by pre-frac-ture roof cutting is carried out.The stress distribution of surrounding rock is optimized by blasting pre-fracture,control of blasting hole's location,angle and explosive doses;increasing the temporary support of single hydraulic support,cutting the stress transfer of voussoir beam,and change of old roof posture.The mechanized working face of 3101 is retained as the re-turn air entry of the 3102 working face,and the retained coal pillars between the upper and lower working face are canceled,thus avoiding coal pillar-caused spontaneous combustion of coal seam,reducing the waste of coal resources,easing the issue of working face's continuity,and realizing the safe and efficient mining of working face's gob-side entry retaining.
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