Solutions to prevent face spall and roof falling in fully mechanized longwall at underground mines, Vietnam

Purpose. On the basis of analysis and assessment geological conditions, technological parameters support methods a longwall, author has pointed out causes rules phenomenon face spall roof falling in fully mechanized longwall. From there, proposes some solutions to prevent this ensure safety Methods. The statistical, survey actual field data are used achieve research results. Findings. results applying relatively good. There effective such as technique force-pumping chemicals directly into coal seam increase connection among masses, solution water combined with enhanced at place on small scale. Originality. many reasons factors that cause longwalls. In present paper, focuses 5 main ruling basis, can be applied conditions longwalls Quang Ninh coalfield, Vietnam. Practical implications. presented article will help mines proactive production. These technical solutions, after being production, allowed quite good results, effectively handled longwall according each specific condition. Thus, it is possible develop for troubleshooting current underground