采矿与岩层控制工程学报2025，Vol.7Issue(3)：18-32,15.DOI:10.13532/j.jmsce.cn10-1638/td.yszt-1047
煤体倾角突变对煤与瓦斯突出及冲击演化特征影响
The influence of abrupt changes of coal dip angle on coal and gas outburst and impact evolution characteristics
摘要
Abstract
To investigate the influence of abrupt changes in coal dip angles within deep and complex geological structures on the evolution characteristics of coal and gas outburst and impact evolution characteristics,an interface with an abrupt change in dip angle is established by taking into account the practical situation of coal and gas outbursts.The upper side of the interface consists of virgin coal,while the lower side consists of briquetted coal,which are utilized to simulate the virgin and the tectonic coal,respectively.With monitoring units,such as impact force testers,acoustic emission detectors,and data acquisition systems,coal and gas outburst simulation experiments under three-dimensional stress conditions are conducted considering different conditions of abrupt dip angle(the initial angle of coal dip angle mutation θI,the mutation angle θM)changes.The influence of coal dip angle mutation on outburst intensity and impact parameters(peak impact force,maximum negative pressure,and duration of sharp change)are analyzed.The research results show that within the range of 10°<θI≤20° and 10°≤θM≤20°,a critical value of coal dip angle mutation θT exists.When both θI and θM are greater than or equal to θT,low-index outbursts are prone to occur.Given a constant θI,the critical gas pressure exhibits a negative correlation with θM,while the outburst intensity per unit shows a positive correlation with θM.The evolution process of impact force in the simulated roadway can be divided into rapid change stage,fluctuation change stage and stable change stage.The number and density of high-frequency pulse A in the positive pressure stage and high-frequency pulse B in the negative pressure stage are closely related to θM.With the increase of θM,the fluctuation of the impact force in rapid change stage becomes more complex,and the high-frequency pulses A and B gradually show a highly concentrated trend in this stage.The peak impact force and the maximum value of negative pressure stage have a negative linear relationship with the gas concentration factor Iθ,while the duration of the rapid change stage has a positive linear relationship with the gas concentration factor.The peak velocity of impact airflow and the cumulative AE energy show basically the same trend.Both of them have a negative linear relationship with the gas concentration factor,and exhibit more significant changes when θM is greater than or equal to θT.关键词
深部复杂地质构造/煤体倾角突变/煤与瓦斯突出/煤粉分布/冲击力/突出强度Key words
deep and complex geological formations/abrupt change in coal dip angle/coal and gas outburst/distribution of coal dust/impact force/outburst intensity分类
矿山工程引用本文复制引用
唐巨鹏,黄磊,潘一山,张昕,任凌冉,张众华..煤体倾角突变对煤与瓦斯突出及冲击演化特征影响[J].采矿与岩层控制工程学报,2025,7(3):18-32,15.基金项目
国家自然科学基金面上资助项目(52374122,51874165) （52374122,51874165）
辽宁省"兴辽英才计划"资助项目(XLYC1902106) （XLYC1902106）
