摘要
为了明晰远距离下保护层开采上被保护煤层应力变化及瓦斯渗流耦合机制,基于吸附解吸、岩石力学和渗流力学等基础理论,以平煤六矿戊8煤层和丁5-6煤层为研究对象,建立含瓦斯煤流固耦合模型,采用COMSOL Multiphysics数值模拟软件探讨保护层不同开采距离下,远距离上被保护煤层应力变化及渗透率演化规律。结果表明:随着保护层工作面推进,上被保护煤层卸压范围增大,应力变化由“V”形逐渐转变为“U”形;上被保护煤层渗透率总体呈“W”形分布,表现为先减小—再增大—后稳定的规律。卸压后上被保护煤层渗透率数值模拟结果为18.53×10^(-17) m^(2),与现场实测结果误差为9.83%,在允许范围之内。对远距离上被保护煤层进行瓦斯抽采数值模拟,发现随着抽采时间增加,上被保护煤层瓦斯压力呈现以钻孔为中心的椭圆形分布,瓦斯压力由内向外逐渐增大,有效抽采半径逐渐增大。钻孔有效抽采半径数值模拟结果与现场实测结果的平均误差为4.81%。本研究为远距离上被保护煤层卸压瓦斯抽采提供了一定的理论指导。
To clarify the stress changes and gas seepage coupling mechanisms in the upper protected coal seam during distant protective layer mining,based on the basic theories of adsorption and desorption,rock mechanics and seepage mechanics,the fluid-solid coupling model of coal containing gas is established with the V 8 coal seam and IV 5-6 coal seam of Pingmei 6 th mine as the research object.The COMSOL Multiphysics numerical simulation is used to study the stress change and permeability evolution law of the protected coal seam at different mining distances.The results indicate that as the protective layer advances,the pressure relief zone of the upper protected coal seam expands,and the stress distribution evolves from a“V”shape to a“U”shape.The permeability of the upper protected coal seam generally presents a“W”-shaped distribution,characterized by an initial decrease,followed by an increase,and then stabilization.The numerical simulation result of the permeability of the upper protected coal seam after pressure relief is 18.53×10^(-17) m^(2),and the error from the field measurement result is 9.83%,which is within the allowable range.Numerical simulations of gas extraction were conducted on the distant protected coal seam.It was observed that as extraction time increased,the gas pressure in the upper protected coal seam formed an elliptical distribution centered around the borehole,with gas pressure increasing from the center outward,and the effective extraction radius expanding over time.The average error between the numerical simulation results for the effective extraction radius and the field measurements was 4.81%.This work provides some theoretical guidance for gas extraction from distant protected coal seams with pressure relief.
作者
石钰
赵佳蕊
詹可亮
赵鹏翔
王翠霞
黄圣霖
宋战利
SHI Yu;ZHAO Jiarui;ZHAN Keliang;ZHAO Pengxiang;WANG Cuixia;HUANG Shenglin;SONG Zhanli(School of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mining and Disaster Prevention and Control,Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China;School of Mechanical and Electrical Engineering,Huainan Normal University,Huainan 232038,China;Shaanxi Huanyu Intelligent Fire Technology Co.,Ltd.,Xi’an 710523,China)
出处
《矿业安全与环保》
北大核心
2025年第1期47-54,共8页
Mining Safety & Environmental Protection
基金
国家自然科学基金项目(11802231,52174205,52204235)
陕西省杰出青年科学基金项目(2023-JC-JQ-40)
陕西省重点研发计划一般项目(2024GX-YBXM-490)。
关键词
保护层开采
应力变化
瓦斯渗流
流固耦合
有效抽采半径
protective layer mining
stress change
gas seepage
fluid-solid coupling
effective drainage radius
