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Three-dimensional roof controlling method for fully mechanized caving of steeply inclined and extremely thick coal seam

A technology of ultra-thick coal seam and steep inclination, which is applied in the field of fully-mechanized opening of steeply inclined ultra-thick coal seam and adopts three-dimensional roof control, which can solve the problems of inability to provide all-round three-dimensional defense, large uncertainty of roof migration, and low degree of coal fragmentation , to achieve high practical value, increase production efficiency and yield, and eliminate potential safety hazards

Inactive Publication Date: 2015-08-19
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual use, the above-mentioned protective measures have the following defects and deficiencies: first, due to the particularity of the steeply inclined and extra-thick coal seam, the goaf is prone to fire and has many safety hazards; Third, the degree of coal fragmentation is low, and the resource recovery rate is low; fourth, the roof migration is highly uncertain, which is likely to cause large-scale roof fall and gas impact; fourth, the protection method is relatively simple, and it cannot be comprehensive, three-dimensional defense and timely Dealing with Security Risks

Method used

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  • Three-dimensional roof controlling method for fully mechanized caving of steeply inclined and extremely thick coal seam
  • Three-dimensional roof controlling method for fully mechanized caving of steeply inclined and extremely thick coal seam
  • Three-dimensional roof controlling method for fully mechanized caving of steeply inclined and extremely thick coal seam

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Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 The fully-mechanized caving of a steeply inclined extra-thick coal seam shown adopts a three-dimensional roof control method. The steeply inclined extra-thick coal seam mined is a coal seam with a coal seam dip angle of more than 45° and a coal seam thickness of more than 8m. The steeply inclined extra-thick coal seam is carried out During mining, the steeply inclined extra-thick coal seam is mined in multiple mining sections from back to front along the coal seam trend. The mining methods of the multiple mining sections are the same and their lengths along the coal seam trend are all L , where L=15m~30m; each of the mining sections is divided into multiple layers from top to bottom, and the multiple layers are arranged horizontally, and the uppermost part of the multiple layers is Layer is the top layer; when mining any mining segment of the steeply inclined extra-thick coal seam, multiple layers of the mining segment are mined from top to bottom, and ...

Embodiment 2

[0091] Such as Image 6 , Figure 7 As shown, in the present embodiment, different from Embodiment 1: the quantity of the pre-explosion roadway 1 constructed in the step 101 is multiple; The number of pre-explosion lanes 1 is three.

[0092] The three pre-explosion lanes 1 are respectively the first pre-explosion lane, the second pre-explosion lane and the third pre-explosion lane from top to bottom. The blastholes 5 are arranged in multiple rows, and the blastholes 5 in multiple rows are arranged from left to right along the length direction of the working face. With the blastholes 5 on both sides, a plurality of blastholes 5 in each row of blastholes 5 includes a middle blasthole above the middle of the pre-explosion lane 1 and a plurality of blastholes located on both sides of the middle blasthole. side blast holes.

[0093] In step 104, during the wetting process of top coal dewatering, install water injection equipment in the bottom pre-explosion roadway, and inject w...

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Abstract

The invention discloses a three-dimensional roof controlling method for fully mechanized caving of a steeply inclined and extremely thick coal seam. The steeply inclined and extremely thick coal seam is mined in multiple sections from back to front along the trend of the coal same, each of the mining sections is cut into multiple sub-layers from top to bottom, and the uppermost sub-layer is a top sub-layer; when any mining section is mined, the multiple sub-layers of the mining section are respectively minted from top to bottom, and the process comprises the following steps: I, mining the top sub-layer: comprising the steps of tunnel construction, extraction of toxic and harmful gas in a pre-denotation roadway, advanced pre-blasting of top coal, drainage to wet the top coal, coal mining and nitrogen injection behind a working face and ground backfill of a subsidence area; II, mining the next sub-layer; and III, repeating the step II once or multiple times till the mining processes of all sub-layers of the mining section are completed. The method disclosed by the invention is simple in step, reasonable in design, convenient to implement and good in using effect, and various protective measures are combined in use, so that the potential safety hazards such as roof caving, gob fire and the like can be effectively eliminated.

Description

technical field [0001] The invention belongs to the technical field of coal seam mining, and in particular relates to a three-dimensional roof control method for fully mechanized caving of steeply inclined extra-thick coal seams. Background technique [0002] The horizontal layered coal mining method refers to dividing the steeply inclined thick coal seam into several 2-3m thick layers along the horizontal direction, and mining them sequentially from top to bottom. The mining face and layered roadway are arranged in each layer, and the roadway in the mining area can be arranged according to double wings or single wings. Section height is generally 15m ~ 30m. The length of the mining face is the horizontal thickness of the coal seam, and the working face advances along the strike. When the horizontal thickness of the coal seam is less than 8m, only one layered roadway needs to be dug on the layered floor; when the horizontal thickness of the coal seam is greater than 8m, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21C41/16
CPCE21C41/18E21C41/32E21F1/006F42D3/00
Inventor 来兴平崔峰曹建涛陈建强单鹏飞张新战漆涛张戈孙秉成蒋东晖
Owner XIAN UNIV OF SCI & TECH
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