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A method for early recovery of top coal in fully mechanized caving face

A technology for fully mechanized caving face and top coal, which is applied in surface mining, earthwork drilling, blasting, etc., can solve the problems of low recovery rate of top coal in fully mechanized caving mining, and achieve the effect of improving the recovery rate of top coal and safe and efficient mining.

Active Publication Date: 2015-07-29
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem of low recovery rate of top coal in fully mechanized caving mining, the present invention provides a method for recovering top coal in advance in fully mechanized caving working face

Method used

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  • A method for early recovery of top coal in fully mechanized caving face
  • A method for early recovery of top coal in fully mechanized caving face
  • A method for early recovery of top coal in fully mechanized caving face

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Effect test

Embodiment 1

[0013] A method for recovering top coal in advance in a fully mechanized caving face, the method is realized by the following steps:

[0014] a. After the layout of the cutout hole 3 in the fully mechanized caving face is completed, a row of blastholes 6 is drilled along the axial direction of the cutout hole 3;

[0015] b. After the blast hole is drilled, mining is carried out; after mining 1 knife, explosives are loaded into the blast hole 6 and detonated, and the basic top 9 is blasted by the explosive;

[0016] c. After the blasting is completed, continue mining; after the blasted basic roof 9 collapses, start to recover the roof coal 7;

[0017] In the step a, the distance between the blast hole 6 and the outer side 4 of the incision hole is 0.3m;

[0018] In the step a, the angle of the blast hole 6 is 25°;

[0019] In the step a, the diameter of the blast hole 6 is 75mm;

[0020] In the step a, the vertical depth of the blast hole 6 is determined by the following for...

Embodiment 2

[0033] A method for recovering top coal in advance in a fully mechanized caving face, the method is realized by the following steps:

[0034] a. After the layout of the cutout hole 3 in the fully mechanized caving face is completed, a row of blastholes 6 is drilled along the axial direction of the cutout hole 3;

[0035] b. After the blast hole is drilled, mining is carried out; after 2 cuts are mined, explosives are loaded into the blast hole 6 and detonated, and the basic top 9 is blasted by the explosive;

[0036] c. After the blasting is completed, continue mining; after the blasted basic roof 9 collapses, start to recover the roof coal 7;

[0037] In the step a, the distance between the blast hole 6 and the outer edge 4 of the incision hole is 0.7m;

[0038] In the step a, the angle of the blast hole 6 is 60°;

[0039] In the step a, the diameter of the blast hole 6 is 75mm;

[0040] In the step a, the vertical depth of the blast hole 6 is determined by the following f...

Embodiment 3

[0053] A method for recovering top coal in advance in a fully mechanized caving face, the method is realized by the following steps:

[0054] a. After the layout of the cutout hole 3 in the fully mechanized caving face is completed, a row of blastholes 6 is drilled along the axial direction of the cutout hole 3;

[0055] b. After the blast hole is drilled, mining is carried out; after mining 1 knife, explosives are loaded into the blast hole 6 and detonated, and the basic top 9 is blasted by the explosive;

[0056] c. After the blasting is completed, continue mining; after the blasted basic roof 9 collapses, start to recover the roof coal 7;

[0057] In the step a, the distance between the blast hole 6 and the outer edge 4 of the incision hole is 0.5m;

[0058] In the step a, the angle of the blast hole 6 is 45°;

[0059] In the step a, the diameter of the blast hole 6 is 75mm;

[0060] In the step a, the vertical depth of the blast hole 6 is determined by the following for...

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Abstract

The invention relates to the top coal recovering technology, specifically to a method for recovering top coals in advance on a full-mechanized caving mining face. According to the invention, the problem that recovery rate of full-mechanized caved top coals is low is solved. The method for recovering top coals in advance on the full-mechanized caving mining face is realized by using the following steps: step a of arranging an open-off cut on the full-mechanized caving mining face, and then drilling a row of bore holes along an axial line of the open-off cut; step b of backstopping after finishing drilling bore holes; putting explosives into bore holes and detonating after backstopping at 1-2 times, and exploding a main roof with explosives; and step c of continuously backstopping after finishing exploding; and starting recovering top coals after the exploded main roof falls down. The method provided by the invention is capable of effectively solving the problem that recovery rate of full-mechanized caved top coals is low, and is applied to developing for thick seams.

Description

technical field [0001] The invention relates to a top-coal recovery technology, in particular to a method for recovering top-coal in advance in a fully mechanized caving face. Background technique [0002] At present, the mining of thick coal seams mainly adopts two methods: fully mechanized mining with large mining height and fully mechanized caving mining. Among them, the advantage of fully mechanized mining with large mining height is high resource recovery rate, but the disadvantage is that the initial investment in equipment is large, and due to the high mining height, coal walls are prone to spalling, which may lead to roof collapse of fully mechanized caving face. Compared with fully mechanized mining with large mining height, the advantage of fully mechanized caving mining is that the initial investment in equipment is small, but its disadvantage is that the recovery rate of top coal is low. Specifically, the top-coal loss in fully-mechanized caving mining mainly in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/16F42D3/04
Inventor 张百胜郝兵元宁剑徐长红张帅陈浩田鹏
Owner TAIYUAN UNIV OF TECH
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