Research on formation mechanism and application of anchor structure for thick coal roadway in sliding structure zone

Aiming at the occurrence condition of coal seam in Zhengzhou mining field, the deformation and failure mechanism of thick coal seam roadway in the sliding structure zone is explained from three aspects: the structure of coal seam, the sequence of overlying strata and the supporting characteristics. The mechanical conditions for the formation of the anchoring structure in the thick coal seam are studied by establishing the mechanical model. According to the geological and mining conditions of 22031 working face in the Chaohua coal mine, the thickness of anchor structure in roof and side are determined by measuring anchor length of bolt. On the basis of these works, the pretension force of bolt needed to form the anchor structure in roof and side are calculated, which are 45.7 kN and 44.0 kN, respectively. The observation data show that the rib-to-rib convergence in the roadway is about 270 mm, and the roof-to-floor convergence is about 330 mm. The deformation of roadway surrounding rock is controlled effectively. © 2017, Editorial Board of Journal of Mining & Safety Engineering. All right reserved.