Research on filtering methane with spatial reticular stucture in coal seam roof fracture zone

被引：0

作者：

Zhang M. ^{[1
,2
]}

Deng W. ^{[2
]}

Tan Z. ^{[1
,2
]}

Tang K. ^{[3
]}

Jiang S. ^{[3
]}

Shang Z. ^{[3
]}

机构：

[1] School of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo

[2] Henan Provincial Key Laboratory of Gas Geology and Gas Governance-State, Key Laboratory Cultivation Base Jointly Built by The Province and The Ministry, Jiaozuo

[3] Shaanxi Fuyuan Coal Industry Limited Liability Company, Fuxian

来源：

Meitan Kexue Jishu/Coal Science and Technology (Peking) | 2023年 / 51卷

关键词：

filtration and purity mechanism; gas drainage; high level borehole; roof fracture; spatial reticular structure;

D O I：

10.13199/j.cnki.cst.2022-1147

中图分类号：

学科分类号：

摘要：

The filtration and purification effect of the seam roof fracture zone on improving the concentration of gas drainage is generally recognized. Gas drainage technology of high-level borehole in fracture zone has also been widely used in gas prevention and control of mining face.In order to study the mechanism of gas filtration and purification, the spatial network structure formed in the fracture zone of coal seam roof is studied by combining theoretical analysis with CT scanning verification experiment. The results show that: there are a large number of macroscopic and microscopic fractures caused by mining in the caving zone, fracture zone and bending subsidence zone above the goaf of the mining face; the geometric size of the fractures gradually decreases, presenting a huge spatial reticular structure; the macroscopic fractures in the caving zone and the lower part of the fracture zone have a higher concentration of gas near the upper part due to the strong diffusion of CH4, and the microscopic fracture net in the middle and upper part of the fracture zone is similar to a huge thick filter membrane,which further inproves the CH4 concentration through viscous flow and Knudsen diffusion filtration.The engineering test results of dangjiahe coal mine in Fuxian show that the upper of the fracture zone with a vertical height of 16-18 m above the roof of the coal seam is the best filtration space of CH4, and the gas drainage concentration is generally above 50%, up to 73%. It is verified that the spatial reticular structure of the coal seam roof fracture zone is correct to filter and purify CH4. The research results have certain guiding significance for the arrangement of high-level drainage boreholes and the efficient drainage and utilization of mine gas. © 2023 Coal Science and Technology. All rights reserved.

引用

页码：96 / 103

页数：7

共 22 条

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