Method for recycling upper part residual coal and backfilling goaf by utilizing full-mechanized caving mining in extremely thick coal seam

A technology for extra-thick coal seams and goafs, applied in the field of coal mining, can solve problems such as sorting, achieve the effects of liberating permanent sluggish reserves, relieving corporate pressure, and avoiding environmental pollution

Active Publication Date: 2015-10-07
TAIYUAN UNIV OF TECH
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Problems solved by technology

Therefore, taking advantage of the characteristics of large overlying rock collapse in fully mechanized caving mining in extra-thick coal seams to recover the upper residual coal seam has become a new way of re-mining residual coal, but this method will face the problem of coal gangue separation after the upper coal seam is lowered

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  • Method for recycling upper part residual coal and backfilling goaf by utilizing full-mechanized caving mining in extremely thick coal seam
  • Method for recycling upper part residual coal and backfilling goaf by utilizing full-mechanized caving mining in extremely thick coal seam
  • Method for recycling upper part residual coal and backfilling goaf by utilizing full-mechanized caving mining in extremely thick coal seam

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Embodiment 1

[0033] Such as figure 1 , figure 2 As shown, the two situations that may occur in the upper thin coal seam are: the entire layer abandons coal 1 or the residual coal pillar 2, the upper thin coal seam is below the interlayer rock layer 3, the interlayer rock layer 3 is an extra-thick coal seam 4, and M is an extra-thick coal seam Working face height, H is the height of the caving zone calculated by the above formula, h 2 is the height of working face in extra-thick coal seam, h 1 is the top-coal caving height, h 3 is the interlayer thickness between two coal layers, h 4 is the thickness of the upper residual coal or abandoned coal, when h 3 + h 4

[0034] With the normal advancement of the fully mechanized caving mining face of the extra-thick coal seam, the top coal in the upper part of the extra-thick coal seam 4, the interlayer rock l...

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Abstract

The invention discloses a method for recycling upper part residual coal and backfilling a goaf by utilizing full-mechanized caving mining in an extremely thick coal seam, and belongs to the field of coal mining. The method is specific to the extremely thick coal seam and is a green method which can be used for recycling the residual coal effectively and specifically comprises the following step: on the premise of determining the height of a caving zone, combining the operations of repeatedly mining upper part abandoned coal or residual coal, preliminarily screening in a pit and backfilling the goaf with gangue. According to the method, residual coal resources are effectively recycled, and environmental pollution caused by transporting the gangue to the ground is avoided, and the problem of surface subsidence is effectively solved.

Description

technical field [0001] The invention relates to a green and high-efficiency method for recovering residual coal, in particular to a method for recovering upper residual coal and backfilling goafs in fully mechanized mining of extra-thick coal seams, belonging to the field of coal mining. Background technique [0002] In recent years, the contradiction between limited coal resources and unlimited resource demand has become increasingly obvious, and the re-mining of residual coal has become a new topic. Residual coal formed by historical reasons roughly includes the entire layer of abandoned coal seams and residual coal pillars with considerable economic effects. The re-mining of these two types of residual coal has become a key research object, but limited by technical conditions and economic factors, The re-mining of residual coal is still in the research stage. [0003] With the continuous innovation of comprehensive mechanized top-coal caving technology, one-time extracti...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16E21F15/00
Inventor 冯国瑞郭军申辰任鸿瑞郭育霞戚庭野张玉江李振白锦文
Owner TAIYUAN UNIV OF TECH
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