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This, in turn, determines filtration time (with constant parameters of medium permeability) of IR and MR broken-down rock complex and poroelastic (unloaded from rock pressure) bedrock and soil roof.
In the A zone, broken-down are IR and MR, and overlying bedrock is stratified, detached part of the roof bedrock is deformed according to the elastoplastic law, and gradually moves its weight onto the goaf.
In zone B, bedrock that was deformed after bedrock stratification in zone A, fully transfers its weight into the goaf, and stratification occurs in the next "packet" of the roof bedrock.