The buried depth of the 210504 airway in Renjiazhuang Coal Mine is approximately 600 m,with a composite roof.Under the original support scheme,the roadway experienced severe deformation,and anchor rods and anchor cable support failed,leading to increased subsequent maintenance costs and potential safety hazards.Based on the geological conditions of the 210504 airway,the dimensions of the roadway section,and the design support parameters,a high prestressed anchor net cable is used to reinforce the fractured and loose coal body in the side of the roadway,transforming it into a load-bearing column.High-stiffness anchor rods are employed to reinforce the composite roof into a beam in the shallow part of the roadway roof.In the deep part,a self-stabilizing hidden arch is formed,and a certain pre-tension force is applied to the an-chor cable to connect the arch-beam into an integral column-beam support structure.Mechanical analysis is conducted on this support structure.Based on this theory,a redesign of the support for the 210504 airway is carried out,and the new support scheme is implemented in subsequent excavations.Through cross-point moni-toring and analysis,significant reduction in roadway deformation is achieved,demonstrating excellent results.
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