Design and optimization of roof drainage scheme for working face at Nalinhe No.2 Mine
To define the roof drainage project for the working face at Nalinhe No.2 Mine and ensure safe exaction,we took No.201 working face of No.3-1 upper coal seam as an example.We made a hydrogeological logging generalization research on No.201 working face of No.3-1 upper coal seam,to analyze the development height and layer of the water conducting fracture zone and to define the third section sandstone aquifer of Yan'an Formation as the influence aquifer for safety mining.According to the geophysical prospecting on anomaly areas and the water abundance zoning by"three maps method",the three maps are comprised of roof aquifer water abundance zoning map,roof caving safety zoning map and roof water burst conditions zoning map.We designed and optimized the roof drainage scheme.By water drainage effect evaluation in terms of the variation of water volume and water pressure during borehole drainage,we verified the reliability of this drainage plan through"three maps method"evaluation.
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