Research on optimization design of supporting parameters of ventilation oxidation zone in driving roadway
Due to the influence of ventilation zone in overlying rock strata,roof breakage,poor forming and anchorage strength of anchor rod can't meet the design requirements when the return air roadway of 1302 working face in Tianshuibao Coal Mine is driven to 315 m,and roof falling accidents are easy to occur in roadway.The development of surrounding rock cracks in 1302 return air roadway was ob-served and analyzed by using borehole and peep technology,and the spatiotemporal evolution of sur-rounding rock cracks in 1302 return air roadway was mastered.Based on the mechanism of roadway roof rock layer superimposed support,the adopted support method was optimized,and the support effect was verified by numerical simulation and industrial test.The results show that the arrangement of"3-3-3"with long and short anchor cable and reinforced ladder beam in an arched section roadway can effectively control the broken surrounding rock in the return air roadway of 1302 working face.The research results can provide theoretical and practical basis for similar roadway support design.
borehole peep technologyfracture developmentrelaxation zone of surrounding rocklong and short anchor cableroadway support
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