Strip-type filling method of high water-swelling material for controlling movement and deformation of overlying strata

Abstract

The invention belongs to the fields of coal mining and filling, and particularly relates to a strip-type filling method of a high water-swelling material for controlling movement and deformation of overlying strata. The filling method is applicable to a coal mining face of a coal bed with the thickness of less than 3m. The method comprises the following steps: determining the limit span L and the safety span M of key strata according to a key strata theory for strata control, then determining the width N of a filling strip through calculation according to the support strength of a filling material, and filling the filling strip with the high water-swelling material. In the invention, by controlling the key strata, the most economical filling ratio can be determined and the maximum benefit can be realized; when no-coal pillar extraction is realized, movement and deformation of the overlying strata are fully controlled within the allowable range, thus realizing gentle and uniform surface subsidence in small quantity; by means of the high water-swelling material, high-recovery mining of coal resources under any condition is realized, and the safety degree of the coal mining face is greatly improved; and normal excavation engineering layout is not affected during the filling process, thus reducing influence on production and achieving high production efficiency.

Description

technical field [0001] The invention relates to a high-water-expansion material strip-type filling method for controlling movement and deformation of an overlying rock layer, which is suitable for a coal mining face with a thickness of less than 3 meters and belongs to the field of coal mining filling. Background technique [0002] With the continuous increase of my country's coal mining intensity, the impact of ground subsidence caused by mining on the environment has become increasingly prominent; and with the extension of mining time, the recoverable reserves in the shallow part (above 600 meters) are getting less and less, and the deep mining Production costs and safety costs are getting higher and higher. How to effectively solve the environmental impact caused by coal mining subsidence and effectively utilize the shallow resources that cannot be mined due to the "three undercuts" of coal pressure are currently important issues facing the coal industry. [0003] To prev...

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Problems solved by technology

[0005] According to the deficiencies in the prior art above, the technical problem to be solved by the present invention is: provide a method that can utilize the lithology of the overlying strata and effectively control the overlying strata after the mining of the coal seam by a method of strip-type partial filling with high water expansion materials. Strip filling method of high water expansion material to control the movement and deformation of the overlying strata to solve the problems of low mining recovery rate and low safety degree of "three down" coal mining, especially suitable for mining of coal seams with a thickness of less than 3 meters coal face

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