Control Technology Research Of Thick Composite Roof In Large Sections Mine Seam Roadway

Based on the research achievement of thick composite roof in Large sections mine seam roadway, theoretical analysis, numerical simulation and the field observation methods are applied to the support technology of composite top-coal large sections roadway, including:(1) Anchoring layer mechanical model is established and deformation and failure mechanism of roadway surround rock is analyzed;(2) Compound roof crack initiation, expansion, nucleation and breakthrough is simulated;(3)By FLAC3D program numerical simulation, it is concluded that the calculation and analysis of the anchorage support surrounding rock stress, displacement field and the stress distribution, and to determine the anchorage support design, high strength bolt DaHang auxiliary shipped, anchor supporting parameters, and finally form the DaHang for auxiliary shipped supporting optimization scheme;(4) the effect of the active role and pre-tightening force of anchor to composite top-coal large sections roadway that are discussed, which provides basis For the stability of surrounding rock control;(5) By industrial experiment and monitoring in the buliangou, the support effects are evaluated after bolt supporting...