【摘 要】
：
Unexpected roof fails often occur in the entries or intersections of active mining sections in underground mines.For large roof fails (greater than 20 ft in height), it becomes dangerous and impractic
【机 构】
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Keystone Mining Services, LLC, Pittsburgh, PA, 15238
【出 处】
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33届国际采矿岩层控制会议(中国)
论文部分内容阅读
Unexpected roof fails often occur in the entries or intersections of active mining sections in underground mines.For large roof fails (greater than 20 ft in height), it becomes dangerous and impractical to clean up the rock debris and re-bolt the newly exposed roof strata.To help mine operators rehabilitate the roof fall areas in a quick, safe, and economic manner, Jennmar Corporation and Keystone Mining Services, LLC (KMS) designed, tested, and developed various impact-resistant (IR) steel set designs, as initially detailed in the proceedings of the 30th International Conference on Ground Control in Mining (ICGCM).Since then, the IR steel sets have been successfully installed in more than 100 roof falls in 43 different coal mines.Significant data has been obtained from these installations, enabling further refinement to and improvement on the design.
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