不同组合方式煤岩组合体强度及声发射特征分析
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摘要
为研究不同高度比的煤岩组合体在不同组合方式下力学特性和声发射特征,利用RFPA2D数值模拟软件对煤岩组合体进行模拟研究。试验结果表明:组合体的单轴抗压强度随煤样在组合体中占比的增大而减小;岩样与煤样的高度比对声发射能量产生显著影响,组合体中岩样高度所占比例越高,声发射信号越强,其产生的声发射能量也越多;在煤岩高度比相同的情况下,不同的组合方式也会对强度产生影响,组合体强度由大到小的组合方式依次为煤-岩、岩-煤、岩-煤-岩;此外,通过组合体声发射特征分析可知,组合体产生的声发射能量与其抗压强度的大小成正比,即抗压强度越大其产生的声发射能量也越大。
To study the mechanical properties and acoustic emission characteristics of coal and rock mass with different height ratios under different compound modes, RFPA2 Dnumerical simulation software was used to conduct the simulation researches for coal and rock mass. Results showed that the uniaxial compressive strength of the combination decreased with the increase of the ratio of the coal block in the combination, and the height ratio of rock to coal had a significant effect on acoustic emission energy.The higher the ratio of rock height in the coal-rock combination, the stronger the acoustic emission signals become, and the more acoustic emission energy it generated; the different combination of coal and rock would also affect the intensity when the coal-rock height ratio was the same, and the intensity of combination indicated the combinations of coal-rock, rock-coal, and rock-coal-rock in descending order. The analysis of the acoustic emission of the combination showed that the acoustic emission energy produced by the combination is proportional to the compressive strength. That is to say, the greater the compressive strength was,the more acoustic emission energy was produced.
To study the mechanical properties and acoustic emission characteristics of coal and rock mass with different height ratios under different compound modes, RFPA2 Dnumerical simulation software was used to conduct the simulation researches for coal and rock mass. Results showed that the uniaxial compressive strength of the combination decreased with the increase of the ratio of the coal block in the combination, and the height ratio of rock to coal had a significant effect on acoustic emission energy.The higher the ratio of rock height in the coal-rock combination, the stronger the acoustic emission signals become, and the more acoustic emission energy it generated; the different combination of coal and rock would also affect the intensity when the coal-rock height ratio was the same, and the intensity of combination indicated the combinations of coal-rock, rock-coal, and rock-coal-rock in descending order. The analysis of the acoustic emission of the combination showed that the acoustic emission energy produced by the combination is proportional to the compressive strength. That is to say, the greater the compressive strength was,the more acoustic emission energy was produced.
引文
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[3]赵宏林,赵越.倾角对煤岩组合体力学及冲击倾向性影响的颗粒流分析[J].煤矿安全,2018,49(3):198.
[4]郭东明,左建平,张毅,等.不同倾角组合煤岩体的强度与破坏机制研究[J].岩土力学,2011(5):1333.
[5]郭伟耀,周恒,徐宁辉,等.煤岩组合体力学特性模拟研究[J].煤矿安全,2016,47(2):33-35.
[6]王晓南,陆菜平,薛俊华,等.煤岩组合体冲击破坏的声发射及微震效应规律试验研究[J].岩土力学,2013(9):2569-2575.
[7]王宁,姜耀东,朱登元,等.坚硬煤岩组合体变形破坏特征及冲击特性研究[J].长江科学院院报,2018,35(3):65-69.
[8]左建平,陈岩,崔凡.不同煤岩组合体力学特性差异及冲击倾向性分析[J].中国矿业大学学报,2018,47(1):81-87.
[9]牟宗龙,王浩,彭蓬,等.岩-煤-岩组合体破坏特征及冲击倾向性试验研究[J].采矿与安全工程学报,2013(6):841-847.
[10]高宇.煤岩组合体冲击破坏试验研究[D].湘潭:湖南科技大学,2017.
[11]王学滨.煤岩两体模型变形破坏数值模拟[J].岩土力学,2006(7):1066-1070.
[12]张子山.煤岩组合体裂纹演化特征研究[C]∥北京力学会第二十四届学术年会会议论文集.北京:北京力学会,2018:2.
[13]张泽天,刘建锋,王璐,等.组合方式对煤岩组合体力学特性和破坏特征影响的试验研究[J].煤炭学报,2012(10):1677-1681.
[14]秦忠诚,陈光波,秦琼杰.组合方式对煤岩组合体力学特性和冲击倾向性影响实验研究[J].西安科技大学学报,2017,37(5):655-661.
[15]兰永伟,张国华,刘洪磊,等.不同组合条件下煤岩组合体的力学特性[J].黑龙江科技大学学报,2018,28(2):136-141.
[16]左建平,谢和平,吴爱民,等.深部煤岩单体及组合体的破坏机制与力学特性研究[J].岩石力学与工程学报,2011,30(1):84-92.
[17]赵毅鑫,姜耀东,祝捷,等.煤岩组合体变形破坏前兆信息的试验研究[J].岩石力学与工程学报,2008(2):339-346.
[18]聂鑫,周安朝.煤岩高度比对组合体力学特性影响的数值分析[J].煤炭技术,2018,37(3):102-104.