Gob-side Entry Retaining and Mining Technology without Coal Pillars of Coal Mining Face
Gob-side entry retaining and mining technology without coal pillars can not only reduce residual coal in the goaf,but also avoid stress concentration problems in the underlying coal seam during mining.Taking 10302 fully mechanized mining face as the research object,based on the mining method without coal pillars,the application of top cutting and pressure relief and gob-side entry retaining technology in the return airway of the mining face was proposed,and a detailed roadway retention plan was formulated.In the top cutting and pressure relief technology,advanced support can improve the stability of the roof during the top cutting and pressure relief period.Top cutting drilling and blasting are the key to blocking the stress transmission between the goaf roof and the roadway section roof.Temporary reinforcement support and gangue blocking support improve the stability of the surrounding rock in the roadway section,avoiding the entry of goaf gangue into the roadway section.After the on-site application of this technology,the surrounding rock of 10302 return air duct retained roadway section remained stable,and the roof subsidence was controlled within 145 mm.
coal miningtop cutting and pressure reliefgob-side entry retaining
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维普
