Mining Publication: Propagation of UHF Radio Waves in Limestone Room and Pillar Mines
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Original creation date: January 1979
This report presents a mathematical model for the propagation of UHF radio waves in the large cross section tunnels of a room-and-pillar limestone mine and describes the analysis of a small amount of propagation data obtained. The model and analysis is based on the waveguide mode theory, developed earlier for the transmission of UHF waves in coal mine tunnels, with allowance for propagation losses due to refraction into the tunnel walls. Propagation around corners and through pillars is also examined based on a ray theory approach together with the beneficial effects of placing reflectors at intersections to significantly reduce corner losses. The theory is found to be in fair agreement with the data; however, additional in-mine measurements are needed to provide a more conclusive test of the model.
Authors: RL Lagace, AG Emslie
Contract/MOA Report - January 1979
NIOSHTIC2 Number: 10002336
Arthur D. Little, Inc. U.S. Bureau of Mines Contract No. J0377065. NTIS No. PB/82-190547, 1979; :1-43
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- Modeling Natural Gas Explosions for Coal Mine Safety
- Numerical Modeling Procedures for Practical Coal Mine Design
- Pillar Stability Issues Based on a Survey of Pillar Performance in Underground Limestone Mines
- Pillar Strength and Design Methodology for Stone Mines
- Stochastic Modeling of Gob Gas Venthole Production Performances in Active and Completed Longwall Panels of Coal Mines
- Straight Line Walking and Path-Turn Identifying Algorithms for a Tracking Device Used in Underground Mines
- Support Design Procedures for Difficult Ground Conditions
- Theory on the Propagation of UHF Radio Waves in Coal Mine Tunnels
- Page last reviewed: 9/21/2012
- Page last updated: 9/21/2012
- Content source: National Institute for Occupational Safety and Health, Mining Program