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The determination of a co-efficient of longwall gob permeability |
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The determination of a co-efficient of longwall gob permeability Author: J. Szlązak
This paper presents a method for the determination of a co-efficient of permeability in a caving zone formed by different kinds of roof rock mass. On the basis of a great number of mining examinations, the co-efficient of permeability was calculated and its change depending on the distance from a longwall face was taken into consideration. The value of the co-efficient of permeability is dependent on the kin d of roof rock mass forming the caving zone. The rocks are characterised by their stratification resistance, which is a decisive factor in whether a rock is susceptible to caving. Determining the co-efficient of permeability is of great significance as far as the estimation of fire hazard in gob is concerned. Knowledge of the co-efficient of permeability allows theoretical calculations of airflow in a caving zone to be made.
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2011