Control over Surrounding Rocks Deformation of Soft Floor and Whole-Coal Gateways with Trapezoidal Su

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In Gengcun Colliery, Yima Coal Group Co. Ltd.the characteristics of the gateways of thick coal seam and the coal seam is with fully mechanized sublevel caving mining are that the thickness of roof coal seam of gateways is larger, their surrounding rocks a
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