Safety withdrawal technology of gangue blocking support in super long gob-side entry retaining
Based on theoretical calculation and actual working conditions,a large composite gangue blocking support with a length of 19 m,roof control area of 38 m2 and gangue blocking area of 61 m2 was developed to meet the technical require-ments of 12～15 m working face.Aiming at the problem of withdrawal of this large support,a new method of withdrawal while mining was studied through field test.When the distance from the stopping line was 35 m,the net roof protection was laid in front of the fully mechanized mining support.When the distance from the stopping line was 20 m,the anchor cable was set up between the fully mechanized mining supports.When the distance from the stopping line was 5 m,the movable gangue blocking baffle at the tail of the end support was removed and the closure shed and wood crib were set up synchro-nously.When the working face was pushed to the stopping line,the end T3 and T4 mesh supports were withdrawn.At the same time,the gangue support is moved forward to the stopping line,and then the gangue support is divided into three sec-tions,which are retracted in turn.Practice has proved that the method is safe and reliable,and realizes the integration of coal mining-retraction-retaining roadway.It has no obvious influence on the speed of working face mining,withdrawal and retaining roadway,and meets the requirements of gob-side entry retaining in high-yield and high-efficiency working face in northern Shaanxi and Shendong mining areas.
gob-side entry retaininggangue blocking supportmining while withdrawingsafety withdrawal
万方数据
维普
