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Coal rib response during bench mining: A case study.

Morgan M Sears1, John Rusnak1, Mark Van Dyke1

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

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|June 5, 2018
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Summary
This summary is machine-generated.

Room-and-pillar mining, common in the U.S., faces risks from rib falls. This study analyzes the geomechanics of bench mining and pillar rib behavior at depths over 300m to improve safety.

Keywords:
Bench miningDeep coverRetreat miningRib responseRib supportThick seam

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Area of Science:

  • Geology
  • Mining Engineering
  • Rock Mechanics

Background:

  • Room-and-pillar mining accounts for a significant portion of U.S. underground coal production.
  • Rib falls in U.S. underground coal mines have caused 12 fatalities in the past decade, with 75% occurring in room-and-pillar mines.
  • High pillar rib failures pose a substantial risk in deep underground coal mines.

Purpose of the Study:

  • To investigate the geomechanics of bench room-and-pillar mining.
  • To analyze the response of high pillar ribs under specific geological conditions.
  • To enhance safety protocols by understanding failure mechanisms in deep mining operations.

Main Methods:

  • Definition and explanation of the bench mining technique.
  • Analysis of pillar response to geological loading.
  • Collection of observational data from a case study.
  • Development and calibration of a numerical model for rib response.
  • Application of the calibrated model to a new mining site.

Main Results:

  • The study defines the bench technique and details pillar response to loading.
  • Observational data from a case history was collected and analyzed.
  • A numerical model was calibrated to accurately simulate observed rib behavior.
  • The calibrated model was successfully applied to a second mining site, demonstrating its predictive capability.

Conclusions:

  • Understanding the geomechanics of bench room-and-pillar mining is crucial for mitigating rib fall risks.
  • The calibrated numerical model provides a valuable tool for assessing and predicting pillar rib stability in deep mines.
  • This research contributes to improved safety standards and operational practices in underground coal mining.