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Coal and gas co-mining method based on mining fissure elliptic paraboloid zone

A fissure and gas technology, applied in the field of coal and gas co-mining

Inactive Publication Date: 2012-12-05
XIAN UNIV OF SCI & TECH
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Problems solved by technology

However, in the implementation process, the determination of the position of the final hole of the gas drainage borehole and the level of the high drainage roadway is still at the level of judgment based on experience

Method used

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  • Coal and gas co-mining method based on mining fissure elliptic paraboloid zone
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  • Coal and gas co-mining method based on mining fissure elliptic paraboloid zone

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Embodiment Construction

[0030] Based on this theory, the arrangement of pressure relief gas drainage roadways or drainage boreholes has been used in Shanxi, Shaanxi and other coal mines, and the on-site engineering practice is guided according to the following steps: With the advancement of the working face, there is a sequential upward layering movement The overlying strata with the characteristics of broken and separated layers will form a mining fracture zone in the overlying rock, in which the stratum detached layer fractures and the layer-penetrating fractures interpenetrate each other, forming an outer boundary in the shape of an elliptical paraboloid in space, called the outer ellipse Throwing surface; when the working face advances for a certain distance, the overburden mining fracture located in the middle of the goaf is basically compacted, and its boundary can also be described by an approximate elliptical paraboloid, called an inner elliptical paraboloid; the method includes the following s...

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Abstract

The invention relates to a coal and gas co-mining method based on a mining fissure elliptic paraboloid zone; the spatial-temporal evolution and the distribution characteristics of the fissure elliptic paraboloid zone which is formed by coating a rock stratum when a working face is propelled during coal bed mining are analyzed through a physically similar material simulation experiment and numerical simulation calculation, the height h1 of an inner elliptic paraboloid surface, the height h2 of an outer elliptic paraboloid surface, incisions and relevant parameters of the working face, an intake airway and a return airway are obtained, and the mathematical formula of the elliptic paraboloid zone is deduced. The results of the physically similar material simulation experiment and a numerical simulation experiment are input into the mathematical formula of the elliptic paraboloid zone, so that the destination of a gas extraction drilled hole and the height of a gas extraction roadway can be determined conveniently. Spot effect inspection proves that putting the destination of the gas extraction drilled hole and a gas extraction roadway into the fissure elliptic paraboloid zone can greatly improve the extraction concentration of gas, so that the coal mining on the working face and continuous extraction of pressure-relieved gas can be promoted synchronously, and a coal and gas co-mining mechanism in high-gas coal bed mining is worked out.

Description

technical field [0001] The invention relates to the field of mine safety engineering technology (gas drainage technology), specifically through the analysis of the temporal and spatial evolution law and distribution characteristics of the mining fissure zone, and the quantitative analysis of the arrangement of the end point of the pressure relief gas drainage borehole (or the end of the drainage roadway) Based on the optimization parameters, a coal and gas co-mining method based on the mining fracture ellipse zone is proposed. It is applicable to the determination of the position of the end hole of the drill hole and the determination of the level of the high drainage roadway in the gas drainage system in the production process of coal mines in my country, which greatly improves the gas utilization efficiency in the production process of coal mines. Background technique [0002] The coal seam occurs underground, and its upper overlying rock is an orderly combination of a ser...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F7/00E21C41/16
Inventor 李树刚林海飞潘宏宇成连华黄金星肖鹏张天军赵鹏翔王红胜
Owner XIAN UNIV OF SCI & TECH
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