A whole layer mining method for mining the bottom layer in shallow buried ultra-thick loose coal seam

Abstract

The invention provides a full-seam extraction method for stoping bottom layering of a shallow extremely thick loose coal seam. The full-seam extraction method comprises the following steps: (a) scientifically dividing an extremely thick loose coal seam; (b) arranging roadways and equipment according to a conventional solid filling mining method so as to form a filling mining system; (c) cutting down the coal seam; (d) filling coal goafs; (e) recycling coal of upper inbreaking coal layers; (f) repeating the steps, and circulating in sequence, thereby completing recycling of the coal seam of a whole section. By adopting the full-seam extraction method for stoping bottom layering of the shallow extremely thick loose coal seam, the coal cutting workload is reduced, limits of conventional filling materials are avoided, the synchronous operation of coal cutting and filling is achieved, and the purposes of sustainable development and green mining in the western areas are achieved; the full-seam extraction method is simple to operate, safe and reliable, high in efficiency, and very high in application and popularization values in ecologically fragile areas in the western China.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and in particular relates to a whole-layer mining method for recovering the bottom layer of a shallow-buried extra-thick loose coal seam. Background technique [0002] In the foreseeable future, coal will still be the basic energy to ensure my country's energy security and stability. The strong demand for coal in the development of the national economy has led to the gradual depletion of shallow coal resources in my country, while the deep coal resources are relatively abundant. For example, in November 2015, the amount of coal resources explored only in the periphery of Panji Coal Mine in Huainan Coalfield was as high as 4.792 billion tons. A considerable part of deep coal resources are extra-thick or extremely thick loose coal seams. At present, there are only layered mining, top-coal caving mining and large mining height mining methods for thick coal seams or extremely thick coal sea...

AI Technical Summary

Problems solved by technology

At present, there are only layered mining, top-coal caving mining and large mining height mining methods for thick coal seams or extremely thick coal seams. However, these three mining methods have their own applicable conditions. Serious problems: the application of layered mining has a low coal recovery rate, which does not meet the country's high recovery rate requirements, and the labor intensity is high; caving coal mining can only be applied to hard coal seams, and if it is used in loose coal seams, natural Disaster accidents such as fire, coal and gas outburst; when using large mining height mining, because the stability of the loose coal seam is extremely poor, if the mining height of the coal seam is too high, the coal wall is prone to accidents such as flaking and roof fall

Water-sand filling, paste filling, quasi-paste filling, gangue filling, etc. currently used also have their own application environments. Due to the constraints of their own environment, there are difficulties in the application of existing filling technologies in the western region.

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