Abstract
Respirable dust surveys were performed in two longwall faces employing a bidirectional cutting pattern. Both mobile and stationary sampling techniques using Real-Time Aerosol Monitors (RAMs) were used. The overall respirable dust concentration generated during tail-to-head cutting is lower than that during head-to-tail cutting, but the difference in respirable dust concentration between both cutting directions in the walkway is insignificant. A two-dimensional (2-D)/two-phase gas-solid particle-diluted suspension model was developed and validated with field measurements. An underground dust sampling method is described in detail and sampling results are highlighted. The 2-D/2-phase model features and model derivation are discussed and its prediction trends are correlated with the field data.