Method for filling aeolian sand empty field of western desert mining area shallow coal seam

Abstract

The invention discloses a method for filling an aeolian sand empty field of a western desert mining area shallow coal seam. The method is suitable for a coal face where the self-stabilization performance of a top plate is good and an empty field in a certain size can be formed in the rear portion. According to the method, by means of the small work amount of drilling from the earth surface to the shallow coal seam and the good self-flowing performance of aeolian sand, drilling arrangement is conducted above the empty field formed by mining of the coal face, the aeolian sand is directly injected into the empty field, the empty field is filled in sections before underground periodic weighting, and then the empty field is filled with the aeolian sand. Due to the fact that the coal seam in the west is shallow, an unconsolidated formation above is thick and bed rock is thin, the work amount of drilling is small, cost is low, and the construction period is short. Meanwhile, overburden failures and subsidence can be effectively avoided, water and sand inrush is relieved, and the western mining area environment is improved. The method provides a novel technological approach for green mining of the western desert mining area, production efficiency is high, the number of invested devices is small, and filling cost is low.

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 mini

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