Forced Roof Caving Technology of Hard Roof in Shortwall Coal Mining Face
ZHUANG Xue-an
ZANG Chuan-wei
ZHUANG Wei
Abstract：In order to solve the long free support distance of a hard roof in a shortwall coal mining face of Yujialiang Mine,based on analy-sis on the roof movement law of the coal mining face,the forced roof caving technology combined with a deep borehole blasting and a shal-low borehole blasting was provided.The application results of the combined technology in No.42209 Coal Mining Face of Yujialiang Mine showed that the technology not only could reduce the explosive quantity applied to the blasting,but also could highly reduce the labor in-tensity of the miners.The technology could realize deep boreholes in the connection gateway,the waste rock after the blasting could backfill the goaf under the blasting boreholes and thus the production coal mining face and the goaf could be isolated.The roof mechanics structure would be changed after the blasting.Therefore,the hard roof in the goaf of the shortwall coal mining face would be fallen naturally,the free support distance of the previous roof could be reduced and a safety and high efficient mining of the shortwall mining face could be ensured.
Keywords：shortwall coal mining facehard roofforced roof cavingdeep borehole blastingshallow borehole blasting
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：4( 14-16,4 )