岩土力学2025，Vol.46Issue(6)：1719-1730,12.DOI:10.16285/j.rsm.2024.1310
煤层倾角突变区煤与瓦斯突出模拟试验研究
Experimental study on coal and gas outburst simulation in abrupt change area of coal seam dip
摘要
Abstract
The abrupt change area of coal seam dip is one of the complex geological conditions that significantly increase the risk of coal and gas outburst during deep mining.Using a mine in Pingdingshan,Henan Province,as the research subject,we conducted experimental research to simulate coal and gas outburst under various inclination mutation conditions.An interface with a dip mutation was established,positioning raw coal on the upper side and type coal on the lower side to emulate primary and tectonic coal seams,respectively.The initial angle(θI)of abrupt change in coal seam dip,the abrupt change angle(θM),the critical value of the abrupt change angle(θT),and the gas concentration coefficient(Iθ)in the abrupt change area of coal seam dip were defined.The above parameters were used to analyze the effect of abrupt change in coal seam dip on the intensity of coal and gas outburst.The unit outburst intensity(IU)was introduced to characterize the strength of coal and gas outburst during the test.Acoustic emission technology was employed to monitor the energy evolution pattern during coal and gas outburst,while temperature changes in each area were recorded using sensors embedded in the sample.The findings of the study indicate that:(1)The abrupt change area of coal seam dip significantly impacts on both the critical gas pressure and the unit outburst intensity during coal and gas outburst.There exists a critical value(θT)of the abrupt change angle in coal seam within the range of 10º<θI≤20º,10º≤θM≤20º.When both θ I and θ M exceed or are equal to θ T,a low-index coal and gas outburst becomes more likely to occur.When θ I or θ M is fixed,the unit outburst intensity in the abrupt change area of coal seam dip increases as the gas concentration coefficient(Iθ)increases.(2)A negative correlation exists between θ I and both the peak and cumulative AE energy.A similar negative correlation exists between M θ and both the peak and cumulative AE energy.As both θ I and θ M increase,the energy required for the coal body to reach rupture and destabilization progressively diminishes.Under identical geostress conditions,this phenomenon facilitates coal and gas outburst even at lower gas pressures.(3)Notable temperature variations occur within the coal body during the incubation and excitation phases of coal and gas outbursts.Temperature changes in the abrupt change area of coal seam dip are significantly higher than in other zones.Temperature fluctuations in the proximal region of the outburst vent show greater instability than in other regions.关键词
煤层倾角突变/煤与瓦斯突出/单位突出强度:声发射能量/温度Key words
abrupt change in coal seam dip/coal and gas outburst/unit outburst intensity/acoustic emission energy/temperature分类
矿山工程引用本文复制引用
唐巨鹏,黄磊,潘一山,任凌冉,张昕,张众华..煤层倾角突变区煤与瓦斯突出模拟试验研究[J].岩土力学,2025,46(6):1719-1730,12.基金项目
国家自然科学基金(No.52374122,No.51874165) （No.52374122,No.51874165）
辽宁省"兴辽英才计划"项目(No.XLYC1902106).This work was supported by the National Natural Science Foundation of China(52374122,51874165)and the Liaoning Province"Xingliao Talent Program"(XLYC1902106). （No.XLYC1902106）
