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Mining Publication: Investigating the Impact of Caving on Longwall Mine Ventilation Using Scaled Physical Modeling
Keywords: Longwall mining Physical modeling Ventilation control
Original creation date: April 2019
Authors: V Gangrade, S Schatzel, S Harteis, J Addis
Peer Reviewed Journal Article - June 2019
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NIOSHTIC2 Number: 20055593
Min Metall Explor 2019
In longwall mining, ventilation is considered one of the more effective means for controlling gases and dust. In order to study longwall ventilation in a controlled environment, researchers built a unique physical model called the Longwall Instrumented Aerodynamic Model (LIAM) in a laboratory at the National Institute for Occupational Safety and Health (NIOSH) Pittsburgh Mining Research Division (PMRD) campus. LIAM is a 1:30 scale physical model geometrically designed to simulate a single longwall panel with a three-entry headgate and tailgate configuration, along with three back bleeder entries. It consists of a two-part heterogeneous gob that simulates a less compacted unconsolidated zone and more compacted consolidated zone. It has a footprint of 8.94 m (29 ft.) by 4.88 m (16 ft.), with a simulated face length of 220 m (720 ft.) in full scale. LIAM is built with critical details of the face, gob, and mining machinery. It is instrumented with pressure gauges, flow anemometers, temperature probes, a fan, and a data acquisition system. Scaling relationships are derived on the basis of Reynolds and Richardson numbers to preserve the physical and dynamic similitude. This paper discusses the findings from a study conducted in the LIAM to investigate the gob-face interaction, airflow patterns within the gob, and airflow dynamics on the face for varying roof caving characteristics. Results are discussed to show the impact of caving behind the shields on longwall ventilation.
First page of Investigating the Impact of Caving on Longwall Mine Ventilation Using Scaled Physical ModelingPeer Reviewed Journal Article - June 2019
Go to Web Page
NIOSHTIC2 Number: 20055593
Min Metall Explor 2019
See Also
Analysis and Design Considerations for Superimposed Longwall Gate Roads
Computational Fluid Dynamics Modeling for Underground Mines
Degasification System Selection for U.S. Longwall Mines Using an Expert Classification System
Design of an Optically Accessible Scaled-Version of a Longwall Coal Mine for Investigating Explosion Hazards
Implications of Recent NIOSH Tracer Gas Studies on Bleeder and Gob Gas Ventilation Design
Modeling and Prediction of Ventilation Methane Emissions of U.S. Longwall Mines Using Supervised Artificial Neural Networks
Overview of Coal Mine Ground Control Issues in the Illinois Basin
Reservoir Engineering Considerations for Coal Seam Degasification and Methane Control in Underground Mines
Studying Longwall Ventilation with Physical Modeling
Technology News 448 - Improving the Performance of Longwall Gob Gas Ventholes
Page last reviewed: July 15, 2019
Page last updated: July 15, 2019
Content source: National Institute for Occupational Safety and Health, Mining Program
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