Abstract:

Regional outburst prevention measures as the most effective, a mine protective layer mining practice, investigated the protective effect of the protective layer on the protected layer after mining coal seam gas pressure, gas content, permeability coefficient changes to protectlayer mining before and after the changes in the indexes show that the protective effect. Less backplane coal rock fracture distribution studies on the protective layer mining process, through numerical experiments simulation on the protection layer mining backplane fissures with distribution, divided into the floor deformation and failure with plastic deformation and bottom plate with the same time divided "upper three bands" each band height.

Key words: protevtive layer, protection effect, numerical simulation, fracture banded distribution.