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Coal mine gob area sealing method

A technology for gobs and coal mines, applied in mining equipment, mining equipment, earth cube drilling, etc., can solve problems such as gas explosion accidents, increase the spontaneous combustion probability of floating coal, etc., achieve low spontaneous combustion probability, low gas explosion probability, and ensure safety Effect

Active Publication Date: 2015-04-01
LIAONING TECHNICAL UNIVERSITY
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  • Abstract
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AI Technical Summary

Problems solved by technology

At this time, the fresh air in the roadway will leak into the goaf through the cracks, and the gas in the goaf will also leak into the roadway through the cracks, especially if too much fresh air is mixed in the goaf, which greatly increases the Spontaneous combustion of floating coal may even lead to gas explosion accidents

Method used

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  • Coal mine gob area sealing method

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0026] The sealing method of the described coal mine goaf comprises the following steps:

[0027] Step 1: Excavate two grooves 2 on the surrounding rock 18 of the roadway near the stop line in the air inlet and return airway 1 of the working face, and the two grooves 2 are distributed at intervals, and the interval distance is 10m;

[0028] Step 2: Excavate a conical cave 3 on the roadway roof between the two grooves 2, the cave height is 2m;

[0029] Step 3: Embedding baffle walls 4 in the two grooves 2 respectively, and the first sealed chamber 5 is composed of the two baffle walls 4 and the roadway surrounding rock between the baffle walls;

[0030] Step 4: install the sand injection pipe 9, the sand injection pipe 9 passes through the baffle wall 4, one end is located in the conical cave 3 of the first sealed chamber 5, the other...

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Abstract

The invention discloses a coal mine gob area sealing method, and belongs to the technical field of coal mine gob area gas extraction. When retaining walls of a first sealing chamber or roadway surrounding rocks between the retaining walls are cracked, cracks can be rapidly filled by the aid of fine sand with flowability under the action of ground stress and mining dynamic stress, and tightness is ensured. By the aid of positive and negative differential pressure characteristics of a second sealing chamber, nitrogen pressure in the second sealing chamber is constantly higher than air pressure in a ventilating roadway, a gob area is separated from the ventilating roadway by the second sealing chamber, air in the ventilating roadway cannot enter the gob area, and gas in the gob area cannot permeate into the ventilating roadway. By double sealing of the first sealing chamber and the second sealing chamber, sealing reliability of the gob area is greatly improved, the probabilities of spontaneous combustion of float coal and gas explosion are minimized, and safety of nearby roadways or working faces is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of gas drainage in coal mine goafs, in particular to a sealing method for coal mine goafs. Background technique [0002] When coal mines are mined, especially under the conditions of coal seam group mining and thick coal seam layered mining, adjacent coal seams, unmined layers, and surrounding rocks will all emit gas into the goaf, and most of the gobs have been closed. There will be a high concentration of gas in the goaf, and the floating coal in the goaf may spontaneously ignite, which will seriously threaten the safe production of the adjacent coal seam or layered mining face. In order to prevent the gas in the goaf from pouring into the mining face, technicians reduce the concentration of gas in the goaf by continuously pumping the gas in the goaf. [0003] The effective sealing of the goaf must be ensured during the gas drainage of the goaf. However, the sealing effect of the gob is not very satisfact...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F17/12E21F7/00
CPCE21F7/00E21F17/12
Inventor 张春华
Owner LIAONING TECHNICAL UNIVERSITY
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