摘要
以开滦东欢坨矿2327工作面回风巷为工程背景,基于能量耗散理论进行沿空掘巷煤柱宽度留设研究。利用热力学第一定律和广义胡克定律构建能量耗散力学模型,揭示煤岩体破坏的内在机理,即岩体单元耗散能超过自身临界值是煤岩体发生破坏的根本原因,基于极限平衡理论计算煤柱合理宽度为4.71 m;利用FLAC^(3D)二次开发,进行不同煤柱宽度能量耗散数值模拟,确定5 m煤柱为能量耗散峰值拐点,为合理的煤柱宽度,可为矿井实际生产提供指导。
Taking the return air roadway of 2327 working face in Kailuan Donghuantuo Colliery as the engineering background,the paper studies coal pillar width setting for gob-side entry driving based on energy dissipation theory and establishes an energy dissipation mechanical model to reveal the internal mechanism of coal and rock mass destruction based on the first law of thermodynamics and the generalized Hooke’s law,that is,the basic reason for the failure of coal and rock mass is that the dissipated energy of rock mass element exceeds its critical value.Based on the limit equilibrium theory,the reasonable size of coal pillar is calculated to be 4.71 m,and the numerical simulation of energy dissipation of different coal pillar widths is carried out by using FLAC^(3D) secondary development,and the 5 m coal pillar is determined to be the inflection point of energy dissipation peak and the reasonable coal pillar size,which can provide guidance for actual mine production.
作者
贾国忠
Jia Guozhong(Shanxi Shuozhou Pingluqu Lanhua Yongsheng Coal Industry Co.,Ltd.,Shuozhou,Shanxi 036803)
出处
《江西煤炭科技》
2023年第1期46-49,共4页
Jiangxi Coal Science & Technology
关键词
沿空掘巷
煤柱宽度
热力学第一定律
广义胡克定律
能量耗散理论
gob-side entry driving
coal pillar width
the first law of thermodynamics
Generalized Hooke’s law
energy dissipation theory
