Optimized reagent dosage effect on rock dust to enhance rock dust dispersion and explosion mitigation in underground coal mines

2016 ◽  
Vol 301 ◽  
pp. 1193-1200 ◽  
Author(s):  
Qingqing Huang ◽  
Rick Honaker
Keyword(s):  
Coal Mines ◽  
Dosage Effect ◽  
Underground Coal Mines ◽  
Dust Dispersion ◽  
Explosion Mitigation ◽  
Rock Dust

Maximum Acceptable Weights of Lift for Common Coal Mine Supply Items

1992 ◽  
Vol 36 (10) ◽  
pp. 654-658
Author(s):  
Sean Gallagher ◽  
Christopher A. Hamrick
Keyword(s):  
Energy Expenditure ◽  
Coal Mine ◽  
Coal Mines ◽  
Metabolic Cost ◽  
The Other ◽  
Task Duration ◽  
Underground Coal Mines ◽  
Different Levels ◽  
Considerable Experience ◽  
Rock Dust

A series of psychophysical lifting studies was conducted to establish maximum acceptable weights of lift (MAWL) for three supply items commonly handled in underground coal mines (rock dust bags, ventilation stopping blocks, and crib blocks). Each study utilized 12 subjects, all of whom had considerable experience working in underground coal mines. Effects of lifting in four postures (standing, stooping under a 1.5 m ceiling, stooping under a 1.2 m ceiling, and kneeling) were investigated together with four lifting conditions (combinations of lifting symmetry and lifting height). The frequency of lifting was set at 4 per minute, and the task duration was 15 minutes. Posture significantly affected the MAWL for the rock dust bag (standing MAWL was 7% greater than restricted postures and kneeling MAWL was 6.4% less than stooped); however, posture interacted with lifting conditions for both of the other materials. Physiological costs were found to be significantly greater in the stooped postures compared to kneeling for all materials. Other contrasts (standing versus restricted postures, stooping under 1.5 m ceiling versus stooping under 1.2 m ceiling) did not exhibit significantly different levels of energy expenditure. Energy expenditure was significantly affected by vertical lifting height; however, the plane of lifting had little influence on metabolic cost. Recommended acceptable workloads for the three materials are 20.0 kg for the rock dust bag, 16.5 kg for the ventilation stopping block, and 14.7 kg for the crib block. These results suggest that miners are often required to lift supplies that are substantially heavier than psychophysically acceptable lifting limits.

A new simple methodology for evaluation of explosion risk in underground coal mines

2013 ◽  
Vol 26 (6) ◽  
pp. 1524-1529 ◽  
Author(s):  
Ljiljana Medic Pejic ◽  
Javier García Torrent ◽  
Enrique Querol ◽  
Kazimierz Lebecki
Keyword(s):  
Coal Mines ◽  
Underground Coal Mines ◽  
Explosion Risk
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