Optimization and Application of Support Parameters for Broken Roof Coal Roadway
Aiming at the problems such as the roof presents a yellow mud like lithology,the support effect of anchor rods is greatly reduced,the roof cannot be effectively controlled,the use of bracket shed coverage method to strengthen support and shorten the bracket shed lag distance results in slow progress and high cost and so on when the 1302 return air crossheading passing through the wind oxidation zone roof fragmentation area in Tianshuibao Coal Mine.The stability control technology of the broken roof surrounding rock of the 1302 return air crossheading is studied and analyzed,straight wall semi-circular arch roadway cross section is proposed and adopted,coordinate with anchor rods(cables)to support the roof fragmentation area of the wind oxidation zone.The theoretical calculation of the required anchor rods(cables)strength for the roof is carried out,and the effectiveness of the support optimization scheme is verified by numerical simulation.The results show that the axial load of the anchor rods(cables)under the condition of straight wall semi-circular arch roadway does not increase with the advancement of the excavation working face,and the strata behavior is not strong.The working condition of the anchor rods(cables)is good,and the support scheme is effective.
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