Application of Gas Drainage Technology in Fully Mechanized Mining Face under Influence of Adjacent Layers

The paper describes the three-tier stereo comprehensive management gas model for the mining height and extended mining face in the high gas mine. The model consists of gas drainage with surface drilling, progressive and shielding gas drainage with 1000m drilling machine from underground and so on. The measures make it easy to realize the combination of surface fracturing and gas extraction, establish the model of cooperation methane drainage from the surface and underground. Meanwhile, the ventilation type, three incoming-air gateways and two returning-air gateways, is used in the mining face. It can effectively avoid exceeding gas in the upper corner of mining face. It can guarantee safe and high-efficient mining. The green mining technology for coal and gas for simultaneous extraction is easily realized. It has important guiding value for mine gas management at similar conditions.

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The Practice about Deep Hole Pre-Split Blasting in Mining Faces of Low Permeability Extra-Thick Seam

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.524-527.781 ◽

2012 ◽

Vol 524-527 ◽

pp. 781-785

Author(s):

Lin Wang ◽

Xi Xi Li ◽

Yu Xiang Zhao

Keyword(s):

Coal Mine ◽

Low Permeability ◽

Deep Hole ◽

Gas Emission ◽

Security Risks ◽

Gas Drainage ◽

Thick Seam ◽

Working Surface ◽

Potential Safety ◽

Mining Face

The rate of gas drainage is lower in mining faces of low permeability of extra-thick seam, and with lots of gas emission, which brings greater security risks. Through the Pre-pumping experiment of deep hole pre-split blasting for 216 mechanized mining face in Xiashijie coal mine of TongChuan coal group, increased the rate of gas drainage over 17% in working surface, that reduced potential safety problems during production, and indicated the direction for later gas government.

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Research of the mine gas drainage optimization evaluation system

Artificial Intelligence and Industrial Application ◽

10.2495/aiia140441 ◽

2015 ◽

Author(s):

K. Shao ◽

B. Jiang ◽

K. Wang

Keyword(s):

Evaluation System ◽

Gas Drainage ◽

Mine Gas

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Coupling Treatment of Gas Drainage and Nitrogen Injection for Fire Prevention in the First Stratified Mining goaf：Theoretical Calculation and Field Experiment

Combustion Science and Technology ◽

10.1080/00102202.2021.1895774 ◽

2021 ◽

pp. 1-15

Author(s):

Yu Hao ◽

Taiping Xie

Keyword(s):

Field Experiment ◽

Fire Prevention ◽

Gas Drainage ◽

Nitrogen Injection ◽

Coupling Treatment

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Investigation on dust dispersion during support movement in a fully mechanized mining face and the technology with support frame enclosure dust control

Proceedings of the Institution of Mechanical Engineers Part E Journal of Process Mechanical Engineering ◽

10.1177/09544089211031116 ◽

2021 ◽

pp. 095440892110311

Author(s):

Jinming Mo ◽

Wei Ma ◽

Dandan Li ◽

Sheji Zhang

Keyword(s):

Wind Speed ◽

Field Application ◽

Dust Concentration ◽

Dust Control ◽

Average Wind Speed ◽

Dust Source ◽

Air Inlet ◽

Support Frame ◽

Site Field ◽

Mining Face

A fully mechanized mining face is characterized by serious dust pollution and dust is a major cause of pneumoconiosis that haunts numerous miners. For a fully mechanized face having large mining heights, the main dust source in the pavement area is produced by the moving support frame. To reduce the amount of dust during support's movement, the distribution and dissipation of dust in this process were studied by combining numerical simulations with underground measurements. The results showed that with an increase of the distance from the air inlet, the wind speed of the sidewalk in the fully mechanized face first increased, then decreased, and finally increased again. At the position of the coal cutter, the highest wind speed was 1.78 m/s and the average wind speed of the roadway was about 0.8 m/s. The dust concentration at the dust source was >1000 mg/m3. An area with a high dust concentration and having a length of 15 m was formed on the rooftop, together with a 50 m long dust belt with a dust concentration of 300 to 450 mg/m3 in the pavement area of 10 m from the dust source. Beyond the 45 m radius from the dust source, the dust concentration was stable at about 250 mg/m3. Based on the dust production characteristics of the support frame, an enclosed dust-guiding device was designed and structure-optimized. Based on the on-site field application test results, it was found that the device has a satisfactory dust-guiding effect during support movement and the dust suppression rate near the dust source reached 94.8%.

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The impact of drilling and slitting construction on damage field: evolution characteristics in low-permeability coal seam

Journal of Mechanics ◽

10.1093/jom/ufaa021 ◽

2021 ◽

Vol 37 ◽

pp. 205-215

Author(s):

Heng Chen ◽

Hongmei Cheng ◽

Aibin Xu ◽

Yi Xue ◽

Weihong Peng

Keyword(s):

Finite Element ◽

Rock Mass ◽

Damage Mechanics ◽

Effective Strain ◽

Secondary Development ◽

Distribution Area ◽

Finite Element Program ◽

Element Program ◽

Mining Face ◽

The Impact

ABSTRACT The fracture field of coal and rock mass is the main channel for gas migration and accumulation. Exploring the evolution law of fracture field of coal and rock mass under the condition of drilling and slitting construction has important theoretical significance for guiding efficient gas drainage. The generation and evolution process of coal and rock fissures is also the development and accumulation process of its damage. Therefore, based on damage mechanics and finite element theory, the mathematical model is established. The damage variable of coal mass is defined by effective strain, the elastoplastic damage constitutive equation is established and the secondary development of finite element program is completed by FORTRAN language. Using this program, the numerical simulation of drilling and slitting construction of the 15-14120 mining face of Pingdingshan No. 8 Mine is carried out, and the effects of different single borehole diameters, different kerf widths and different kerf heights on the distribution area of surrounding coal fracture field and the degree of damage are studied quantitatively. These provide a theoretical basis for the reasonable determination of the slitting and drilling arrangement parameters at the engineering site.

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