A gas control method for working face with large mining height in high gas coal seam

A technology with large working face and large mining height, which is applied in the direction of gas discharge, mining equipment, earthwork drilling and mining, etc., can solve the problems of large gas emission, tension of working face recovery and connection, and the failure of working face gas to meet the standard, so as to reduce gas The effect of reducing the amount of outflow, increasing the speed of mining connection, and avoiding gas accumulation

CN104481578BInactive Publication Date: 2016-04-20LIAONING TECHNICAL UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2016-04-20
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention provides a gas control method for a large-mining-height working face of a high gas coal seam, and belongs to the technical field of safety of mines. The gas control method comprises the steps of arranging a first bed extraction tunnel during excavating at the working face; upwards arranging a crossing hole through the first bed extraction tunnel to pre-extract gas; arranging and cutting holes in the bed extraction tunnel to pre-extract gas; arranging an inclined connection roadway to form a ventilation circuit; arranging a second bed extraction tunnel and a connection roadway; pre-extracting gas through the crossing hole which is upwards arranged through the first bed extraction tunnel; arranging a high extraction tunnel to reach a gob caving slit band; arranging the crossing hole in the high extraction tunnel; pumping gas at the high extraction tunnel. According to the gas control method for the large-mining-height working face of the high gas coal seam, gas pumping drilling holes are arranged in each tunnel, a gas treatment scheme under the combination of the bed extraction tunnel, the high extraction tunnel and the current coal seam extraction is created, and therefore, the gas emission rate in the excavating and recovery periods at the working face can be effectively reduced, the continuing speed of recovery at the working face is raised, the gas accumulated at the working face and upper corners and ultralimit of gas can be effectively avoided, and as a result, the safety in production at the working face can be ensured.
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Description

technical field

[0001] The invention belongs to the technical field of coal mine safety, and in particular relates to a gas control method for a high-gas coal seam working face with a large mining height. Background technique

[0002] For high-gas coal seams with large mining heights, the original gas content in the working face is high, and gas overrun or even gas disaster accidents are prone to occur during the rapid excavation of the working face; in addition, during the mining of the working face, the roof is damaged Due to the influence of mining, deformation, subsidence and collapse will occur, and then a large goaf will be formed. The height of the fracture development will increase significantly, and the range of communication with adjacent layers will be large, so that a large amount of gas in the adjacent layers will flow into the goaf, resulting in the deep mining of the goaf. A large amount of gas is accumulated, and under the action of the concentration differen...

Examples

Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] The gas control method for a large mining height working face in a high gas coal seam comprises the following steps:

[0033] Step 1: during the excavation process of the current working face 1, starting from the main road 2, along the middle position of the floor between the return air lane 3 of the adjacent working face and the transportation lane 4 of the current working face, a first bottom pumping lane 7 is excavated in parallel in advance;

[0034] Step 2: through the first bottom pumping roadway 7, arranging the layer-crossing drilling 13 upwards, and performing gas pre-pumping operations on the coal body where the roadway to be excavated is located, and at the same time conducting geological structure detection to guide the roadway excavation;

[0035] Step 3: stagger the incision 10 outward, and then excavate an incisi...