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Application of the coal mine floor rating (CMFR) to assess the floor stability in a Central Appalachian Coal Mine.

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Moderate Cover Bleeder Entry and Standing Support Performance in a Longwall Mine: a Case Study.

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Deep cover bleeder entry performance and support loading: A case study.

Ted M Klemetti1, Mark Alexander Van Dyke1, Ihsan Berk Tulu2

  • 1Ground Control Branch, NIOSH, Pittsburgh Mining Research Division, Pittsburgh 15236, USA.

International Journal of Mining Science and Technology
|January 29, 2019
PubMed
Summary
This summary is machine-generated.

Deep cover bleeder entries experience minimal rear abutment loading, with most stress from development, not longwall extraction. Instrumentation and modeling confirmed low loads and convergence on standing supports.

Keywords:
Abutment loadingBleeder entryFull extractionLongwall miningStanding supports

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Area of Science:

  • Mining Engineering
  • Geotechnical Engineering
  • Computational Mechanics

Background:

  • Deep cover mining presents challenges in predicting rear abutment loading in bleeder entries.
  • Current modeling procedures for assessing rear abutment extent and loading require validation.
  • Understanding standing support utilization in bleeder entries is crucial for mine safety and efficiency.

Purpose of the Study:

  • To evaluate the performance and support loading in deep cover bleeder entries.
  • To assess the accuracy of current modeling procedures in calculating rear abutment extent and loading.
  • To determine if improved understanding warrants changes in standing support strategies.

Main Methods:

  • Instrumentation of pumpable cribs in four bleeder entries at varying distances from the startup room.
  • Observation of entry conditions and data collection during longwall extraction.
  • Numerical modeling using Flac3D to simulate stress and loading conditions.

Main Results:

  • Instrumentation showed minimal loading (<23 Mg) and convergence (<2.54 cm) on standing supports.
  • Numerical modeling indicated that stress increase was primarily due to gateroad and bleeder entry development (80%), with only 20% from longwall extraction.
  • Models showed good correlation with expected gateroad loading and measured results.

Conclusions:

  • The rear abutment stress experienced by the studied bleeder entry design is minimal.
  • Support loading and convergence decrease with increasing distance from the startup room.
  • The numerical modeling method effectively replicated expected and measured results near the seam.