Abstract
To invesigate the behavior of coal seam around roadway faces, the laboratory experiments were taken effect by drilling test, hydrostatic compression test, gas permeability test, triaxial compression test with and without pore gas pressure and outburst fracture test.Based on results of above experiments together with field test data from a large diameter operations for stress relief at Akabira Coal Mine, the following considerations are obtained;Coal seam ahead of a roadway face can be devided into two regions. One is fractured region in the vicinity of the face where the stress is already relieved. Most of cracks in this region may be open so that the ductile fracture is dominant and the coal seam is relatively permeable to gas. Another is intact region under high stress ahead of the fractured region. Cracks in this region may be mostly closed so that the brittle fracture manner is dominant and the coal seam is relatively unpermeable. There is, therefore, a possibility that coal in the boundary region bursts out toward the roadway.
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