Filling method of aeolian sand void in shallow coal seam in western desertification mining area

Abstract

Provided is a method for filling an open stope with aeolian sand in a shallow coal seam in western desertified mining areas, which is suitable for a coal mining face having a better roof self-stabilization and being capable of forming an open stope of a certain size in the rear portion. By using the features of a small amount of work involved in drilling from the earth surface to the shallow coal seam and a good self-flowing performance of aeolian sand, drilling arrangement is conducted above an open stope (9) formed after a coal mining face (8) is mined, and the open stope is directly filled with aeolian sand, and is filled in stages prior to underground periodic weighting such that filling the open stope with aeolian sand is achieved. Because the western coal seam is shallowly buried and has a thick overlying loose layer and a thin bedrock, the amount of work involved in drilling is small, the cost is low, and the construction cycle is short. Moreover, the problems of overlying rock destruction and earth surface subsidence can be effectively solved, and inrushes of water and sand are relieved, improving the environment of the western mining areas. A new technical approach is created for green mining in the western desertified mining areas of our country, and has a high production efficiency, less equipment investment and a low filling cost.

Description

technical field [0001] The invention relates to a method for filling an aeolian sand void in a shallow buried coal seam in a western desertification mining area of ​​a coal mine, and is especially suitable for a coal mining face with a better roof self-stabilization performance and a certain-scale void at the rear. Background technique [0002] The western desertification mining area is characterized by shallow coal seam burial, large mining thickness, thin bedrock thickness, thick aeolian sand loose layer, and hydrogeological characteristics of locally thick aquifer in the aeolian sand loose layer. Mining under these conditions is not only likely to cause overlying rock damage and surface subsidence, but also easily lead to major disasters such as water inrush or sand collapse. Engineering practice has shown that water inrush or sand burst to bury the working face or roadway is one of the main hidden dangers threatening mine safety. And filling mining is the most intuitive...

AI Technical Summary

Problems solved by technology

[0004] Technical problem: The purpose of this invention is to solve the problems existing in the existing filling technology, and to provide a method for filling the aeolian sand void in the shallow coal seam in the western desertification mining area, and to use the aeolian sand filling to solve the overlying rock damage and surface subsidence , water inrush and sand collapse, etc., thereby improving production efficiency, reducing investment in equipment, and reducing filling costs

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