Surrounding Rock Control Technology in Goaf Retaining Roadway by Cutting Top and Relieving Pressure of Thick Coal Seams
In order to solve the problem of large amount of roadway deformation in goaf retaining process of thick coal seam working face,a mechanical model of goaf retaining at the side of cut and depressurized roadway was established through theoretical analysis.The key parameters of cut and depressurized roadway retaining were optimized by using UDEC numerical simulation method,and the support scheme of flexographic concrete side filling,cut and depressurized roadway retaining was proposed.The results of engineering practice show that the stress of the bolt in the return air roadway of 3502 working face is about 37%lower than that of the transportation roadway without cutting and pressure relieving,the maximum subsidence of the roof is 40-150 mm,the deformation of the side is less than 120 mm,and the effect of cutting and pressure relieving is good.The research results can provide some engineering guidance for the parameter design of cutting top and retaining roadway under similar geological conditions.
top cutting and pressure reliefgob-side entry retainingroadway side fillingflexographic concrete
NETL
NSTL
万方数据
