Close-range coal seam mining and stowing with upper entry

摘要

The environmental damages caused by coal mining mainly contain surface subsidence which is induced by the large area of gobs and environmental pollution which is induced by the banking of the solid wastes.In order to reduce the unfavorable effects caused by the mentioned factors,a plan to exploit the close-range coal seam with the solid wastes as primary material and a upper entry used for stowing was put forward.The upper entry was arranged at the above coal seam or sill,and the lower coal seam should be mined and filled first.After mining the lower coal seam,the upper coal seam would be mined with backfilling.The layout of the roadways and the applicability of the upper entry were introduced,and the prioritization scheme of the mining was discussed.Also the economic performance of the technology was analyzed.It hopes that the suggested technology is helpful for controlling the subsidence and reducing the solid wastes,and mining and stowing with the upper entry can realize the least environmental damages.