Compared to opencut mining, underground coal mining is more common in Australia due to its lesser impact on the environment. Although there are several underground mining methods, such as the longwall, pillar, bord, and miniwall, longwall mining is the most commonly used method due to its high efficiency. However, longwall mining does lead to significant ground subsidence. Mining subsidence is ...

It is very important to study the stability of tunnel in area affected by mining activities. In particular, choice coal pillar size has a direct influence on these tunnels. The authors this used Flac3D program model face LC1 with various sizes. 220 m-long known as 20 degrees rock mass layers. studied pillars are widths at 5 m, 8 10 15 and 30 m. highest vertical stress maximum horizontal placed ...

Assessment of respirable dust, personal exposures of miners and free silica contents in dust were undertaken to find out the associated risk of coal workers' pneumoconiosis in 9 coal mines of Eastern India during 1988-91. Mine Research Establishment (MRE), 113A Gravimetric Dust Sampler (GDS) and personal samplers (AFC 123), Cassella, London, approved by Director General of Mines Safety (DGMS) w...

During gob-side entry driving under complex conditions in inclined short-distance coal seams, the roadway loses stability and deforms seriously, which affects safety efficiency of mine production. In this study, a reasonable pillar width was explored by means on-site investigation, theoretical analysis, numerical simulation, engineering tests. The following research results were obtained: (1) s...