Factors – Gas
Factors 0 Comment
GAS ENVIRONMENT The most important factors associated with the gas environment in an outburst prone region are the seam gas pressure, gas permeability and the gas content and composition. Mining operations promote the change of methane into a fully gas state and the resultant increase in gas pressure triggers the [...]
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Factors – Coal
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STRENGTH OF THE COAL SEAM The strength and elastic module of the coal seam influence the fracture mechanics of an outburst. Stored elastic strain energy is released, and the failure is usually brittle indicating that the strain energy is not being used to distort the strata and a large proportion [...]
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Outburst Definition
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Outburst DefinitionOutburst CavernOutburst SizeOutburst Definition Outburst has been defined as a spontaneous ejection of gas and coal from the solid face, where the gas is a mixture of methane and carbon dioxide. This definition is questioned in the use of the term “spontaneous” as this suggests an outburst occurs without [...]
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Glossary
Overview 0 CommentAbutment Pressures When an opening is created in a coal seam, the stress that was present before the opening was created is re-distributed to the adjacent coal pillars that are left. The areas within the remaining coal where the vertical stress is greater than the average are called abutments and […]
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