Continuous mining method with rigid and flexible strip alternating filling and without coal pillars in inclined seam goaf

Abstract

The invention relates to a continuous mining method with rigid and flexible strip alternating filling and without coal pillars in an inclined seam goaf. According to the method, the inclined seam goafis subjected to rigid strip filling, the strip parallel working face is arranged, the material is sand-based backfill paste, the spacing is less than the initial caving step pitch of an immediate roof, and the stoping side between the upper end of the strip to a pathway drift is completed; the reserved pathway drift is adopted to conveying aeolian sand to the goaf, the aeolian sand is fully arranged in gas between the rigid strips in a filling mode, and flexible supporting strips for the goaf top plate are formed; and the aeolian sand strips are subjected to backfill paste wall sealing on thepathway drift stoping side. According to the continuous mining method with rigid and flexible strip alternating filling and without the coal pillars in the inclined seam goaf, the self-slip propertyof the aeolian sand is adopted to ensure the effect of the aeolian sand dry-filling the immediate roof, the overall stability of the filling strips is improved, the long-term control effect of the filling body on the roof of the inclined seam goaf is ensured, the reserved pathway drift can be used for stoping of the next working surface, and working surface continuous mining without the coal pillars is achieved.

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.

Images