Continuous mining method with rigid and soft strip filling without coal pillars in the goaf of inclined coal seam

Abstract

The invention relates to a method of continuous mining with rigid and flexible strips filling alternately in the goaf of an inclined coal seam without coal pillars. In the method, the goaf of the inclined coal seam is firstly filled with rigid strips, the strips are arranged parallel to the working surface, and the material is sand-based paste. The body and spacing are smaller than the initial caving step of the direct roof, and the upper end of the strip ends at the recovery side of the track entry; then the aeolian sand is transported to the gob by using the reserved track entry, poured into and filled with the rigid strip to form a flexible support strip for the roof of the goaf; finally, the aeolian sand strip is closed with a paste wall on the mining side of the track level entry. The non-coal pillar-free continuous mining method of rigid and flexible strip filling in the goaf of the inclined coal seam utilizes the self-slipping property of the aeolian sand to ensure the effect of the aeolian sand dry filling to the roof, improves the overall stability of the filling strip, and ensures The long-term control effect of the filling body on the roof of the goaf in the inclined coal seam is ensured; the reserved track entry can serve for the mining of the next working face, and realize continuous mining without coal pillars between the working faces.

Description

technical field [0001] The invention relates to an underground coal mine mining method, in particular to a continuous mining method with rigid and flexible strips filling without coal pillars in the goaf of an inclined coal seam. Background technique [0002] Northwest my country, especially Xinjiang, is rich in coal resources, and the coal seams have a large dip angle, and are mostly distributed in arid, semi-arid deserts or Gobi areas, where water resources are scarce and the ecological environment is extremely fragile. The mining fissures and surface subsidence produced by the traditional caving method will cause serious damage to groundwater resources and surface vegetation. Filling mining is an effective method to reduce mining fissures and surface subsidence, and filling materials and filling methods are important factors affecting the overall technical economy of filling mining. At present, the gob filling materials mainly include coal gangue, paste materials, high-w...

AI Technical Summary

Problems solved by technology

At present, the protection of coal pillars in the sections between working faces is the main cause of coal loss in underground coal mines.

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