Overlying strata isolation grouting filling method for underground emission reduction of coal gangue

Abstract

The invention relates to an overlying strata isolation grouting filling method for underground emission reduction of coal gangue, and belongs to the field of emission reduction of coal gangue in coal mining. The overlying strata isolation grouting filling method comprises the steps that according to information of a coal face, a grouting filling key layer is determined, and a plurality of branch holes are downwards constructed in a main hole of directional drilling from the directional drilling of an underground roadway to the interior of the grouting filling key layer; and a grouting and filling system is built underground, tunneling gangue and selected gangue of a mine are crushed and ground into filling slurry, cracks below a key layer are filled with the filling slurry through directional drilling, the key layer is effectively supported, and rock stratum movement and surface subsidence are controlled. According to the overlying strata isolation grouting filling method for underground emission reduction of the coal gangue, the coal gangue generated by the mine is directly prepared into the filling slurry underground and then is filled into the overlying strata mining-induced fractures, so that harmless treatment is realized.

Description

Technical field [0001] The present invention relates to an underground coal gangue reduction method, in particular for coal gangue Overburden reduction downhole isolation grouting method. Background technique [0002] Coal is an important part of large coal-based solid waste, with a large, wide range of features, the traditional ground covers piling led to a series of problems, such as pollution, have a serious impact on the mining environment. Decontamination and disposal of coal waste has become a key issue of sustainable development related to mining. After the slurry is made suitable gangue by grouting technique was filled to the fracture of overburden, not only to achieve the purpose of reduction of waste rock, the rock is also possible to achieve the control surface sink, etc. Save multiple purposes. [0003] Patent disclosed ZL2012101649299 "Overlying isolated section grouting rock mining process" drilled into the coal seam mining overburden in the ground by grouting fract...

AI Technical Summary

Problems solved by technology

[0003] Patent ZL2012101649299 discloses the "Coal Mining Method for Mining Overlying Rock Partition Isolation and Grouting Filling", which is to inject grout into the mining cracks in the overlying rock layer above the coal seam through ground drilling, so as to realize waste disposal, support the key layer of overlying rock, and prevent The purpose of ground subsidence; the grouting filling disclosed by this method is implemented through the ground drilling and filling system, and the source of coal gangue discharge is formed during underground excavation and coal mining. Using this method, the gangue must be lifted to Grouting filling treatment on the ground cannot achieve the purpose of processing coal gangue from the source; and the grouting drilling construction of this method needs to occupy a certain construction site, which is affected by ground buildings and structures, and the location of the grouting drilling Often can not be set in the ideal position, or even construction drilling

In summary, the existing overlying rock isolation grouting filling technology can not be applied to the underground treatment of mine coal gangue. Therefore, there is an urgent need for a new overlying rock isolation grouting filling method for coal gangue underground emission reduction to realize mine The purpose of in-situ harmless treatment of coal gangue underground during the mining process

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