Technology and Application of Roof Cutting and Pressure Relief for Gob-side Entry Retaining in Close Distance Coal Seams
In mining the close distance coal seams,when the upper coal seam mining was fin-ished,the floor was damaged.As the gangue collapsed in the goaf,the roof structure and stress environment of the lower coal seam became more complex,and the integrity and stability of the roof of the lower coal seam roadway would also be affected,which brought difficulties for the control of the surrounding rock of the lower coal seam roadway.Taking the gob-side entry retai-ning of the close distance coal seams in Longmenta Coal Industry as the research background,we got the specific parameters of roof cutting through theoretical calculations,proposed the roof cut-ting technology with static expansion cracking,optimized the support form,and achieved coal pillar-free roof cutting and pressure relief along the gob.Field practice shows that the lower coal seam roadway was less affected by mining and the retaining effect was better.
close distance coal seamsoverlapping layoutstatic expansion crackingroof cutting and pressure relief
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