Coal-pillar-free semi-normal-position goaf-side entry retaining method

A technology of retaining roadways without coal pillars, which is applied in the direction of earthwork drilling, filling, safety devices, etc., to achieve obvious effects, reduce spans, and prevent deformation and sideslip

Inactive Publication Date: 2013-01-02
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the adjacent working face is mined, it is necessary to complete the re-excavation along the small coal pillar or the filling wall

Method used

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Embodiment Construction

[0015] The implementation steps of a semi-in-situ gob-side entry retention method without coal pillars are as follows:

[0016] 1. Advance tearing of the side: advance the working face, tear the side on the mining side of the entry, pick out the false roof, and pre-reinforce the roof.

[0017] 2. The support moves forward: the support moves forward in sequence according to the coal mining step. When the displacement distance behind the support reaches the length of a single filling wall, the filling is performed.

[0018] 3. Support behind the frame: The roof must be supported in time every time the frame moves a step. When the roadway adopts the frame support method, the frame needs to be erected in advance.

[0019] 4. Clean up the vertical formwork: clean up the empty gangue on the bottom of the roadway at the area to be filled behind the outlet support on the working face, and fix the filling formwork at a certain distance from the mining side of the roadway. Then lay a p...

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Abstract

The invention relates to a goaf-side entry retaining arrangement process of mining of coal mines in a pit, in particular to a coal-pillar-free semi-normal-position goaf-side entry retaining method. The coal-pillar-free semi-normal-position goaf-side entry retaining method is characterized in that a semi-normal-position construction filling wall body is used on a entry retaining working face, one side of the edge of an isolation wall body is located at the position in a lateral wall portion of a recovery side of a roadway before mining for an A distance, and the other side of the edge of an isolation wall body is located in a goaf area. The coal-pillar-free semi-normal-position goaf-side entry retaining method enables one side of the filling wall body to be arranged in an original roadway, is easy in top connection, appropriately reduces entry retaining spans, is apt to reduce strata behavior degree, and is favorable for maintenance of entry retaining section size and integrity of a top plate.

Description

technical field [0001] The invention relates to a coal pillar-free semi-in-situ gob-side retaining method for coal mine underground mining, which is suitable for the gob-side retaining technology under general conditions, especially when the roadway section before mining is relatively large and the lithology of the roof is poor, and the roadway is retained for repair The effect is more obvious when the system is complete. Background technique [0002] In order to improve the recovery rate of coal resources and recover the protective coal pillars left in the traditional mining method, certain technical means can be used to re-support the tunnel in the previous section for the use of the next section. Gobside retaining, that is, along the edge of the goaf, the mining roadway behind the mined working face is supported by pillars, masonry gangue belts or filled with concrete and is preserved along the goaf as the mining roadway of the next working face. Gobside entry retaining ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F15/00
Inventor 张农郑西贵张鹏冲季明阚甲广
Owner CHINA UNIV OF MINING & TECH
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