各向异性层状砂岩应变岩爆试验研究
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摘要
利用在真三轴应力状态下可实现单面突然卸载的深部应变岩爆模拟试验系统,研究了4种层理倾角(0°,30°,60°和90°)的各向异性层状砂岩的应变岩爆破坏特征.通过采集试验过程中的力、高速摄像和声发射信号,以应力曲线和声发射累计能量曲线为基础确定分析关键点.详细描述了不同层理倾角砂岩岩爆后的整体破坏特征和岩爆碎屑特征,分析了4种层理倾角砂岩岩爆试验过程中关键点的声发射累积能量特征.研究发现:层理倾角显著影响岩爆破坏模式,层理倾角较小时更易发生岩爆,岩爆烈度较低,但试样整体破坏更严重.
Strain rockburst tests of the anisotropic and stratified sandstone samples with 4 different bedding angles(0°, 30°, 60° and 90°), were conducted in laboratory. Using a special strain rockburst test system, the abrupt unloading on one loading surface under the true triaxial compression condition was conducted. According to signal acquisition for the stress, high-speed photography and acoustic emission data, the key points of analysis were determined. The strain burst modes and rock fragments under different orientated bedding planes were compared and analyzed systematically. Additionally, the characteristic of the accumulated energy of acoustic emission during the rockburst tests were analyzed. The results show that the bedding plane orientations significantly influence the strain burst modes. The smaller the angle between the bedding planes and the maximum principal stress is, the more prone the strain burst occurs, and the lower the intensity is, while the more serious the sample's overall failure is.
Strain rockburst tests of the anisotropic and stratified sandstone samples with 4 different bedding angles(0°, 30°, 60° and 90°), were conducted in laboratory. Using a special strain rockburst test system, the abrupt unloading on one loading surface under the true triaxial compression condition was conducted. According to signal acquisition for the stress, high-speed photography and acoustic emission data, the key points of analysis were determined. The strain burst modes and rock fragments under different orientated bedding planes were compared and analyzed systematically. Additionally, the characteristic of the accumulated energy of acoustic emission during the rockburst tests were analyzed. The results show that the bedding plane orientations significantly influence the strain burst modes. The smaller the angle between the bedding planes and the maximum principal stress is, the more prone the strain burst occurs, and the lower the intensity is, while the more serious the sample's overall failure is.
引文
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[2] HE M C,NIE W,ZHAO Z Y,et al.Experimental investigation of bedding plane orientation on the rockburst behavior of sandstone[J].Rock Mechanics and Rock Engineering,2012,45(3):311-326.
[3] 聂雯.层状砂岩岩爆特性实验研究[D].北京:中国矿业大学(北京),2011:1-170.NIE Wen.Experimental investigation of rockburst behavior of oriented sandstone[D].Beijing:China University of Mining and Technology (Beijing),2011:1-170.
[4] HE M,JIA X,GONG W,et al.Physical modeling of an underground roadway excavation in vertically stratified rock using infrared thermography[J].International Journal of Rock Mechanics and Mining Sciences,2010,47(7):1212-1221.
[5] 陈天宇,冯夏庭,张希巍,等.黑色页岩力学特性及各向异性特性试验研究[J].岩石力学与工程学报,2014,33(9):1772-1779.CHEN Tianyu,FENG Xiating,ZHANG Xiwei,et al.Experimental study on mechanical and anisotropic properties of black shale[J].Chinese Journal of Rock Mechanics and Engineering,2014,33(9):1772-1779.
[6] TIEN Y M,KUO M C,JUANG C H.An experimental investigation of the failure mechanism of simulated transversely isotropic rocks[J].International Journal of Rock Mechanics and Mining Sciences,2006,43(8):1163-1181.
[7] KULATILAKE P H S W,MALAMA B,WANG J.Physical and particle flow modeling of jointed rock block behavior under uniaxial loading[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(5):641-657.
[8] PENG H,GAO F,YANG Y,et al.Effect of the layer orientation on mechanics and energy evolution characteristics of shales under uniaxial loading[J].International Journal of Mining Science and Technology,2016,26(5):857-862.
[9] 邓华锋,王伟,李建林,等.层状砂岩各向异性力学特性试验研究[J].岩石力学与工程学报,2018,37(1):112-120.DENG Huafeng,WANG Wei,LI Jianlin,et al.Experimental study on anisotropic characteristics of bedded sandstone[J].Chinese Journal of Rock Mechanics and Engineering,2018,37(1):112-120.
[10] 杨忠民,高永涛,吴顺川,等.基于等效岩体技术的节理参数对岩体强度影响性研究[J].中国矿业大学学报,2018,47(5):979-986.YANG Zhongmin,GAO Yongtao,WU Shunchuan,et al.Study of the influence of joint parameters on rock mass strength based on equivalent rock mass technology[J].Journal of China University of Mining & Technology,2018,47(5):979-986.
[11] 韩智铭,乔春生,涂洪亮.含一组贯通节理岩体强度的各向异性分析[J].中国矿业大学学报,2017,46(5):1073-1083.HAN Zhiming,QIAO Chunsheng,TU Hongliang.Analysis of strength anisotropy of rock mass with a set of persistent joints[J].Journal of China University of Mining & Technology,2017,46(5):1073-1083.
[12] JAEGER J C.Shear failure of anistropic rocks[J].Geological Magazine,1960,97(1):65-72.
[13] TIEN Y M,KUO M C.A failure criterion for transversely isotropic rocks[J].International Journal of Rock Mechanics and Mining Sciences,2001,38(3):399-412.
[14] ZHAO Y,SEMNANI S J,YIN Q,et al.On the strength of transversely isotropic rocks[J].International Journal for Numerical and Analytical Methods in Geomechanics,2018,42(16):1917-1934.
[15] 杨健,王连俊.岩爆机理声发射试验研究[J].岩石力学与工程学报,2005,24(20):3796-3802.YANG Jian,WANG Lianjun.Study on mechanism of rock burst by acousitc emission testing[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(20):3796-3802.
[16] WANG J,XIE L,XIE H,et al.Effect of layer orientation on acoustic emission characteristics of anisotropic shale in Brazilian tests[J].Journal of Natural Gas Science and Engineering,2016,36:1120-1129.
[17] 潘俊锋,刘少虹,杨磊,等.动静载作用下煤的动力学特性试验研究[J].中国矿业大学学报,2018,47(1):206-212.PAN Junfeng,LIU Shaohong,YANG Lei,et al.Experimental study of dynamic characteristics of coal under static and dynamic loads[J].Journal of China University of Mining & Technology,2018,47(1):206-212.
[18] SUN X,XU H,HE M,et al.Experimental investigation of the occurrence of rockburst in a rock specimen through infrared thermography and acoustic emission[J].International Journal of Rock Mechanics and Mining Sciences,2017,93:250-259.
[19] 陈炳瑞,冯夏庭,明华军,等.深埋隧洞岩爆孕育规律与机制:时滞型岩爆[J].岩石力学与工程学报,2012,31(3):561-569.CHEN Bingrui,FENG Xiating,MING Huajun,et al.Evolution law and mechanism of rockburst in deep tunnel:Time delayed rockburst[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(3):561-569.
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