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goaf
An approximate theory to predict the event of main and periodic roof falls in the goaf behind the long wall face is given.
      
It describes recently closed collieries and their make of water, and details the migration of these quantities through a variety of roadways and goaf areas to the new lodgement facilities to be installed at Bentinck Colliery.
      
Consequently, the results obtained by using the fuzzy influence function method can automatically give rise to a shift of the inflection point towards the goaf and asymmetry in shape.
      
On one approach to calculation of the stress-strain state of a rock mass in the vicinity of a goaf
      
The stress-strain state of the rock mass is evaluated, with increase in depth of the deposit mining and volume of the mine goaf.
      
The layer reexcavation ratio is proposed to use for determination of overburden thickness in the combined conveying and direct-dumping systems of mining by draglines with haulage to goaf.
      
During periods of low barometric pressure, gas seepages from goaf as well as freshly exposed faces was common.
      
Special care needs to be taken where gas drainage pipes, borehole pumps and the like are located on the surface above goaf areas.
      
Two test wells were drilled into virgin coal areas and two wells were drilled into sealed mine goaf.
      
 

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