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

A gob-free, coal-pillar-free technology, which is applied in the direction of filling, ground mining, mining equipment, etc., can solve problems such as coal loss in underground coal mines, achieve continuous mining without coal pillars, ensure control effects, and reduce filling costs Effect

Active Publication Date: 2019-02-12
XINJIANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Effect test

Embodiment Construction

[0021] In the figure, the operation steps of the non-pillar-free continuous mining method are as follows:

[0022] ① After the working face 5 of the inclined coal seam is recovered from the cut hole, the overdue working face 5 is about 30-60m, and the track level roadway 1 is reinforced with anchor cables;

[0023] ② When the advancing distance of the inclined coal seam working face 5 is close to the initial caving step of the direct roof 8, fill the goaf with paste strips for the first time. The lower end is to the non-recovery side of the transport entryway 9, the upper end of the strip 6 is to the recovery side of the track entryway 1, the width of the strip 6 is 3-10m, and the paste material is aeolian sand, cement, fly ash and water reducer The composition of the mixture, the water-cement ratio is 0.5;

[0024] ③ The aeolian sand is transported to the goaf via the rail entry 1 by using the overturning van type mine car 3, and the aeolian sand is unloaded into the non-rec...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/18E21F15/00E21D19/02
CPCE21C41/18E21D19/02E21F15/005
Inventor 张志义吕金星陈辉
Owner XINJIANG UNIVERSITY
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