Gas extraction method based on mining-induced fracture circular rectangular half-space zone

A technology of gas drainage and fissures, which is applied in the direction of gas discharge, mining fluid, mining equipment, etc.

Inactive Publication Date: 2013-12-04
XIAN UNIV OF SCI & TECH
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  • Application Information

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Problems solved by technology

However, in the implementation process, the determination of drilling parameters for gas drainage is still at the level of judgment based on experience.

Method used

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  • Gas extraction method based on mining-induced fracture circular rectangular half-space zone
  • Gas extraction method based on mining-induced fracture circular rectangular half-space zone
  • Gas extraction method based on mining-induced fracture circular rectangular half-space zone

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Effect test

Embodiment Construction

[0023] Based on this theory, the arrangement of pressure relief gas drainage roadways or drainage boreholes has been used in many coal mines in Shanxi, Shaanxi, etc., and the on-site engineering practice is guided according to the following steps. When the working face advances to a certain distance, the rock layer is separated The fissures and piercing fractures are connected with each other, and on the plane parallel to the coal seam, the fissures in the overlying strata of the air inlet lane (8) and the air return lane (9) are connected with the fissures of the overlying strata on the cutting hole and the working face, There is an annular fissure development area with a certain width in a rectangular frame, and there is a compacted fissure in the middle of the annular ring. If the working face is long enough, it can form a rectangle similar to rounded corners. On the section perpendicular to the coal seam, the fracture positions of the overlying strata are staggered from bot...

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Abstract

The invention relates to a gas extraction method based on a mining-induced fracture circular rectangular half-space zone. By analyzing dynamic evolution characteristics, a mechanical mechanism and influence factors of the mining-induced fracture zone, the open-off cut side bandwidth is obtained and is about a first weighting interval, the working face side bandwidth changes within 2-3 times of a periodic weighting interval, the bandwidth near a wind inlet lane and the bandwidth near a wind return lane are about the 0.7-0.8 time of the first weighting interval, the height of an inner half-space face and the height of an outer half-space face are controlled by a key stratum position and the deformation, fracture and instability states of a formed masonry beam structure, accordingly, arrangement parameters of end points of mining-induced pressure relief gas extraction drill holes are determined, the field effect test shows that as the gas extraction drill holes are formed in the mining-induced fracture circular rectangular half-space zone, the gas extraction concentration is improved greatly, synchronized advancement of coal mining on a working face and continuous pressure relief gas extraction is achieved, the mechanism of mining coal and gas together at a high-gas coal seam is obtained, and the gas extraction method based on the mining-induced fracture circular rectangular half-space zone is formed.

Description

technical field [0001] The invention relates to the field of mine safety engineering technology (gas drainage technology), in particular to a gas drainage method based on circular-rectangular terraces in mining cracks. It is applicable to the determination of gas drainage drilling parameters in the production process of high-gas coal mines in my country, which greatly improves the gas utilization efficiency in the production process of coal mines and reduces the probability of gas accidents. Background technique [0002] The coal seam occurs underground, and its upper overlying rock is an orderly combination of a series of rock layers, and one or several relatively hard thick rock layers in the layered combination play a major role in controlling the deformation and destruction of the entire overlying rock mass. This hard stratum is called a key stratum, and most overburdens have more than one key stratum. After the coal seam is mined, the overlying strata will undergo defl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21F7/00
Inventor 林海飞李树刚成连华张杰潘红宇肖鹏赵鹏翔黄金星张天军王红胜李莉魏宗勇
Owner XIAN UNIV OF SCI & TECH
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