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Safe, Efficient, and Cost-Effective Support of Longwall Cut-Through Entries
35th International Conference on Ground Control in Mining
Safe, Efficient, and Cost-Effective Support of Longwall Cut-Through Entries
by
Benjamin MirabileJohn R Poland, Jennmar Corporation, Pittsburgh, United States
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[Conference] 35th International Conference on Ground Control in Mining
[Price] Free  [Comments] 0
[Topical Area] Operator Case Histories
[Author] Benjamin MirabileJohn R Poland, Jennmar Corporation, Pittsburgh, United States
[Abstract] 
Key Conclusions:
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Fiber-reinforced concrete crib material can be used in potentially high convergence environments associated with long wall mining. It is particularly important to engineer the proper load-displacement characteristics of the installed crib to support expected ground conditions. The cost of fiber-reinforced crib supports are less than 50% of backfilling methods.
Key Findings:
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Despite conceptions of poor performance in potentially high convergence environments, fiber-reinforced concrete crib material can be used in long wall support applications subject to high abutment loads. Central to the proper design of these supports is the use of yield material between crib layers and at the mine roof/crib interface. The placement location of cribs within the cut-through entry has a significant effect on the main roof behavior and associated ground conditions in the long wall abutment zones.
Objective of the Paper:
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This paper will demonstrate the use of fiber-reinforced concrete crib material as a method for standing support in long wall cut-through entries.
Problem Statement:
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There are significant ground support hazards to both personnel and equipment when long wall equipment must mine through cross-panel entries. Backfilling support strategies are often cost-prohibitive. Additionally, it is often very difficult to install backfill material in full contact with the mine roof in backfilled entries.