Research On Effect Law Of Coal Seam Penetrability After Mining Protection Layer

In the paper,taking Hong Ling coal mine in Shen Yang forexample,during mining 11^# coal seam,7^# and 12^# coal seam withoutburst of coal and gas were depressurized, author studieddistributing law of mining—induced fractures and mutative law ofpermeability of coal and rock. Author researched mechanicscapabicity of coal with gas; By physical simulation, author analyzeddistributing law of mining—induced fractures mutative law ofpermeability during mining protection Layer with speckles of whitelight diffraction; Author simulated mutative law of stress anddisplacement fields and movement of plastic area by FLAC^3D,andanalyzed distributing law of mining—induced fractures and mutativelaw of permeability of coal and rock.According to relationship between stress and permeability, author simulated variety ofpermeability with excavating by FLAC^3D, author attained mutativelaw of permeability of coal and rock by analyzing the simulated result.