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2021-05-21T05:05:15+00:00
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MetRes hires Coal Augering Services for Mavis Downs and
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The construction condition of air auger drilling in some soft coal seams Mine district NO of coal seam Boring machine Drilling tools Hole depth/m LUlin mine of Huaibei coal industry group 8# ZDY3200S ž85mm+ž 73mm 120 Qinan mine of Huaibei coal industry group 32 ZDY3200L ž94mm+ž 73mm 238 Songshu town mine of tonghua coal industry 1 A variable wall mining machine to release coal from a longwall mine face, comprising: a plurality of sidecutting auger sections to release and convey coal along a mine face, universal coupling means joining said auger sections together in an endtoend relation to form an articulated auger assembly for extending along the longwall mine face,Variable wall mining machine KELLEY; JAY HILARYUsing the geological conditions of Chiyu Coal Mine and its corresponding mechanical and geometrical parameters of E = 20 GPa, Q = 20 MPa, H = 14 m, H 1 = 80 m and w = 5 m, the relationship between the maximum roof movement at the auger location for the worstcase scenario and AM width is plotted in figure 11(a) based on equation , which shows Permeability enhancement performance and its control