A layered non-integral filling mining method for extra-thick coal seams

Abstract

The invention discloses an extra-thick coal seam stratified non-integral filling mining method. The extra-thick coal seam stratified non-integral filling mining method is used for mining "three-lower"extra-thick coal seam and stratifying synthetically by combing coal quality property and devices, and the stratified height is determined; then methods of upper room column non-integral filling recovering coal pillar and lower strip-type filling and mining are used, coal seams are sequentially mined by the two methods, and the upper layer is mined firstly then the lower layer is mined until the whole layer of coal are mined completely. The extra-thick coal seam stratified non-integral filling mining method makes good use of coal seam instead of artificial false roof, the material wastage is greatly reduced, a filling method realizes non-integral filling, and filling materials are saved; a method of combing mining and filling is realized in the process of mining, in the absence of a coal pillar, solid cemented filling materials are quickly used instead of the coal pillar, sharp change of overlying rock is strictly controlled, the safety of ground buildings is ensured, and the upper andlower structures are matched to control ground depression.

Description

technical field [0001] The invention relates to a layered non-integral filling mining method for an extra-thick coal seam, in particular to a mining method for non-integral filling of an extra-thick coal seam under the condition of "three-down" coal pressing, and belongs to the technical field of coal mining. Background technique [0002] The mining of the "three lower" coal seams has always been within the special mining range. Scholars at home and abroad have done a lot of research on the mining of the "three lower" coal seams, and some achievements have achieved good results, especially in thin coal seam mining. Under certain circumstances, the effect is more significant-effectively protecting the surface buildings. However, for the mining of "three-down" extra-thick coal seams, the solution has not been very good. Either laying false roofs is time-consuming and time-consuming, or using a large amount of waste rock for filling, which will greatly increase the freight cost...

AI Technical Summary

Problems solved by technology

However, for the mining of "three-down" extra-thick coal seams, the solution has not been very good. Either laying false roofs is costly and time-consuming, or it is filled with a large amount of gangue, which greatly increases the freight cost and the filling scheme is not good.

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