Practices on Gateway Retaining Along Goaf Side in Thin Seam with Hard Roof

In order to select the rational support mode and parameters of the gateway side along the goaf, based on the hard roof geological and technical conditio ns of a thin seam in Beixulou Mine as the background, with the comparison analysis on the three gateway retaining along the goaf plans, the gateway retaining operatio n was conducted with the H steel bar shield and the single prop as the support means in the gateway and the coal rejects zone lined at the side of the goaf as the reinfo rced support.The parameters of the gateway retained along the goaf side was optimized and designed.When the distance between the cipollettic shields was 0.8 m and when the width of the coal reject zone was 3 m, the difficult breaking problem of the hard roof could be effectively solved.With the trial of the gateway retained along the goaf, the pilot obvious influence scope of the coal mining face would be 16.3 m and the average convergence of the gateway cross section would be 19.78% which coul d meet the production requirements of the next coal mining face.