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Dynamic Phenomenon in Coal Mine Roadway Boundary and Supporting Adjustment in Bursting Condition

The boundary magnification phenomenon was achieved in the coal mile surrounding rock, the displacement of surrounding rock was gradually increased, then more gentle in the plastic zone and sharply increase in the broken zone. The overall process of the displacement of surrounding rock exhibited graded changing trend; when the impact came, the broken zone had connected fissures caused by stretch of waves. It eventually increased the degree of damage in the boundaries of the broken zone and roadway. Accordingly, roadway support parameters were adjusted appropriately. From the energy point of view, the length of the anchor bolt was extended properly and that of the anchor cable was reduced properly. The adjusted length of the anchor bolt and cable well matched the size of the broken zone and plastic zone in roadway on site. There was a very good support effect. Anchor production process was also considered to improve gradient strength of materials which can better adapt to the rock burst environment.