Numerical Simulation Study and Engineering Validation based on Coal Seam Roadway Excavation

IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY
Jin Yan, Minbo Zhang, Ziyi Zhong, Mengzhen Du, Zichao Wang
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引用次数: 0

Abstract

In order to effectively prevent and control the gas disaster during the mining of deep coal rock bodies and improve the extraction efficiency, this paper carries out the research on the coal microstructure, gas seepage and the characteristic parameters of the coal rock bodies by means of scanning electron microscopy and low-temperature liquid nitrogen adsorption test, and adopts a combination of numerical simulation and on-site engineering validation to study the stress distribution around the surrounding rock after excavation, the range of fracture zone and plastic zone generated by the coal rock around the drill hole to optimise the design parameters of gas extraction in the mining area, by using FLAC 3D and COMSOL Multiphysics. The stress distribution around the surrounding rock after excavation, and the range of fracture and plasticity zones generated in the coal rock around the drill holes, in order to optimise the design parameters of gas extraction in the mine. The study shows that: with the increasing of lateral pressure coefficient, the stress concentration phenomenon in the roadway evolves into vertical symmetrical distribution, the working face of the test mine coal seam crushing area ranges from 0 to 5m, the coal seam plastic area ranges from 12 to 16 m, the stress concentration area ranges from 8 to 24 m, and the original stress area is after 24 m, and the depth of drilling hole reaches the peak of the stress at 16 m, and the drill cuttings method is adopted on the site to verify the simulation results, and then it is decided to determine the reasonable sealing depth of 2#coal seam in the test mine. After verifying the simulation results by drilling chip volume method on site, it is determined that the reasonable sealing depth of the test mine 2# seam is 16 m.

Abstract Image

基于煤层巷道开挖的数值模拟研究及工程验证
为了有效防治深部煤岩体开采过程中的瓦斯灾害,提高开采效率,本文采用扫描电镜和低温液氮吸附试验对煤岩体的微观结构、瓦斯渗流和特征参数进行了研究。采用数值模拟与现场工程验证相结合的方法,利用FLAC 3D和COMSOL Multiphysics软件,研究开挖后围岩周围的应力分布、钻孔周围煤岩产生的破裂带和塑性带范围,优化矿区瓦斯开采设计参数。挖掘后围岩的应力分布及钻孔周围煤岩产生的断裂和塑性区范围,以优化矿井瓦斯抽采设计参数。研究表明:随着侧压系数的增大,巷道内应力集中现象演变为垂直对称分布,试验矿井工作面煤层破碎区范围为0 ~ 5m,煤层塑性区范围为12 ~ 16m,应力集中区范围为8 ~ 24m,原始应力场在24m之后,钻孔深度在16m处达到应力峰值;并在现场采用钻屑法对模拟结果进行了验证,从而确定了试验矿井2#煤层的合理密封深度。通过现场钻屑体积法对模拟结果进行验证,确定试验矿2#煤层合理密封深度为16 m。
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来源期刊
Solid Fuel Chemistry
Solid Fuel Chemistry CHEMISTRY, MULTIDISCIPLINARY-ENERGY & FUELS
CiteScore
1.10
自引率
28.60%
发文量
52
审稿时长
6-12 weeks
期刊介绍: The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.
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