Elimination mechanism of coal and gas outburst based on geo-dynamic system with stress-damage-seepage interactions
Lingjin Xu1
Chaojun Fan1
Mingkun Luo2
Sheng Li3
Jun Han1
Xiang Fu1
Bin Xiao1
1.College of Mining,Liaoning Technical University,Fuxin 123000,China2.Energy Business Department,Shanxi Lu'an Chemical Group,Changzhi 046200,China3.Resource Department,Liaoning Geology Engineering Vocational College,Dandong 118000,China
摘要：Coal and gas outburst is a complex dynamic disaster during coal underground mining.Revealing the disaster mechanism is of great significance for accurate prediction and prevention of coal and gas outburst.The geo-dynamic system of coal and gas outburst is proposed.The framework of geo-dynamic system is composed of gassy coal mass,geological dynamic environment and mining disturbance.Equations of stress-damage-seepage interaction for gassy coal mass is constructed to resolve the outburst elimination process by gas extraction with boreholes through layer in floor roadway.The results show the occurrence of outburst is divided into the evolution process of gestation,formation,development and termination of geo-dynamic system.The scale range of outburst occurrence is determined,which provides a spatial basis for the preven-tion and control of outburst.The formation criterion and instability criterion of coal and gas outburst are established.The formation criterion F1 is defined as the scale of the geo-dynamic system,and the instability criterion F2 is defined as the scale of the outburst geo-body.According to the geo-dynamic system,the elimination mechanism of coal and gas outburst—'unloading+depressurization'is established,and the gas extraction by boreholes through layer in floor roadway for outburst elimination is given.For the research case,when the gas extraction is 120 days,the gas pressure of the coal seam is reduced to below 0.4 MPa,and the outburst danger is eliminated effectively.
机标关键词：mechanismstressdamagesystemwithbasedcoalelimination
论文发表日期：2023-08-28
在线出版日期：2025-08-15（本平台首次上网日期，不代表文献的发表时间）
页数：15( 47-61 )
英文信息