Research on Roof Cutting and Pressure Relief Technology Under Joint Mining in Close Distance Coal Seam
In the process of close distance coal seam joint mining,the hanging roof causes serious deformation and damage to the roadway excavation.In response to the problems of convergence and support damage and others of the two sides of the lower layer roadway in the close distance coal seam,by conducting analysis of factors such as the damage characteristics and geological conditions and so on of the stoping face roof,the 9104 working face roadway blasting and roof cutting and the 10104 working face roadway large diameter drilling and pressure relief scheme are adopted.The results show that the excavation of the close distance coal seam roadway is greatly affected by the roof stress.Reasonable roof cutting measures can significantly reduce the stress level of the roadway surrounding rock.By setting a reasonable drilling layout way,the roof above the roadway and the goaf roof strata can be effectively cut off,blocking the mechanical connection between the roof strata and maintaining the stability of the excavation roadway surrounding rock.Through the reasonable roof cutting and pressure relief scheme,the convergence deformation and support damage of the excavation roadway in Huayuan Coal Industry are effectively controlled.
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