基于声发射的含瓦斯煤试件失稳破坏预测研究
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摘要
基于岩石破裂损伤理论和气固耦合方法,利用RFPA2D数值模拟系统,对含瓦斯煤试件在破裂过程中声发射(AE)的分布特征进行了研究,并结合AE在时间和空间上的分布特征对失稳破坏区域进行预测。研究表明:含瓦斯煤试件在形成宏观破坏发生失稳前都有明显的声发射前兆,利用声发射在时间上的分布特征可对失稳破坏做出提前预警,利用由拉应力作用产生的声发射前兆信息在空间上的分布特征,可对裂纹的起裂区域做出较准确预测;能为含瓦斯煤体失稳破坏的防治及声发射监测技术在煤矿的应用提供理论基础,具有一定的理论和现实意义。
Based on the rock failure damage theory and the gas-solid coupling method,the paper studies the distribution of Acoustic Emission (AE) of coal specimens containing gas in failure process by using RFPA2D numerical simulation system,and then predicts the instability and failure zones by its temporal-spatial distribution. These results shows:obvious AE precursor always appears before macro-failure formation and instability of the gassy coal specimens. By the temporal distribution of AE,the instability and failure can be alarmed; by the spatial distribution of AE precursor produced by the tensile stress,cracking zones can be predicted. The study provides the theoretic foundation for the application of inability and failure control of gassy coal seam and AE monitoring technology in mines.
Based on the rock failure damage theory and the gas-solid coupling method,the paper studies the distribution of Acoustic Emission (AE) of coal specimens containing gas in failure process by using RFPA2D numerical simulation system,and then predicts the instability and failure zones by its temporal-spatial distribution. These results shows:obvious AE precursor always appears before macro-failure formation and instability of the gassy coal specimens. By the temporal distribution of AE,the instability and failure can be alarmed; by the spatial distribution of AE precursor produced by the tensile stress,cracking zones can be predicted. The study provides the theoretic foundation for the application of inability and failure control of gassy coal seam and AE monitoring technology in mines.
引文
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[2]Hsu N N,Simmons J A,Hardy S C.An Approach to Acoustic Emission Signal Analysis.Material Evaluation,1977,35:100-106
[3]Maji A K,Sahu R.Acoustic Emissions from Reinforced Concrete.Experimental Mechanics,1994,34:379-388
[4]徐涛.煤岩破裂过程固气耦合数值试验[D].沈阳:东北大学,2004.
[5]唐春安.岩石声发射规律数值模拟初探[J].岩石力学与工程学报,1997,16(4):368-374.
[6]许昭永,梅世蓉,庄灿涛,等.真三轴压缩时几种岩样微破裂定位的初步结果[J].地震学报,1992,14(增):702-709.
[7]陈忠辉,傅宇方,唐春安.岩石破裂声发射过程的围压效应[J].岩石力学与工程学报,1997,16(1):65-70.
[8]杨永杰,陈绍杰,韩国栋.煤样压缩破坏过程的声发射试验[J].煤炭学报,2006,31(5):562-565.
[9]李庶林,尹贤刚,王泳嘉,等.单轴受压岩石破坏全过程声发射特征研究[J].岩石力学与工程学报,2004,23(15):2499-2503.
[10]俊平,周创兵.岩体的声发射特征试验研究[J].岩土力学,2004,25(3):374-378.
[11]孙吉主,周健,唐春安.影响岩石声发射的几个因素[J].地壳形变与地震,1997,17(2):1-5.
[12]宋富喜.岩石声发射实验研究动态及研究成果综述[C].地壳构造与地壳应力文集(18),2006,47-53.
[2]Hsu N N,Simmons J A,Hardy S C.An Approach to Acoustic Emission Signal Analysis.Material Evaluation,1977,35:100-106
[3]Maji A K,Sahu R.Acoustic Emissions from Reinforced Concrete.Experimental Mechanics,1994,34:379-388
[4]徐涛.煤岩破裂过程固气耦合数值试验[D].沈阳:东北大学,2004.
[5]唐春安.岩石声发射规律数值模拟初探[J].岩石力学与工程学报,1997,16(4):368-374.
[6]许昭永,梅世蓉,庄灿涛,等.真三轴压缩时几种岩样微破裂定位的初步结果[J].地震学报,1992,14(增):702-709.
[7]陈忠辉,傅宇方,唐春安.岩石破裂声发射过程的围压效应[J].岩石力学与工程学报,1997,16(1):65-70.
[8]杨永杰,陈绍杰,韩国栋.煤样压缩破坏过程的声发射试验[J].煤炭学报,2006,31(5):562-565.
[9]李庶林,尹贤刚,王泳嘉,等.单轴受压岩石破坏全过程声发射特征研究[J].岩石力学与工程学报,2004,23(15):2499-2503.
[10]俊平,周创兵.岩体的声发射特征试验研究[J].岩土力学,2004,25(3):374-378.
[11]孙吉主,周健,唐春安.影响岩石声发射的几个因素[J].地壳形变与地震,1997,17(2):1-5.
[12]宋富喜.岩石声发射实验研究动态及研究成果综述[C].地壳构造与地壳应力文集(18),2006,47-53.
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