bedrock

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Thus, undermined bedrocks subside, this decreasing cleavage span along the wall length and reducing cleavage cracks.
In a situation where stratification crack propagates not along the coal bed, it is necessary to take into account permeability of bedrocks between coalbeds and the plane of cleavage (see Figure 2, a).
Since the well will not only cross the stratification plane, but elastically hanging bedrocks and caved in bedrocks in the goaf that also contain gas, calculation of production rate in these bedrocks can be made by the equation for calculating filtration into the well (see Figure 2, b).