岩石压缩过程应力-应变-磁感强度效应的实验研究
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摘要
为了弄清岩石挤压产生的磁感强度效应,将钕铁硼Nd-Fe-B磁芯分别植入圆柱形大理岩、石灰岩中,在其周围产生磁场。借助断裂使岩石导磁回路与磁强发生的改变,进行挤压过程中应力、应变和磁感强度三变量测试。研究结果表明:岩石裂隙变化能够引起磁感强度的改变,应力-应变-磁强存在一一对应的数值关系;达到最大应力前,大理岩、石灰岩周围磁感强度出现增大异常的破坏预兆;在岩石裂解阶段,应力-应变曲线与磁强-应变曲线的变化规律具有明确的反对称性。最后还建立了分段表达岩石应力-磁感强度拟合关系式。
In order to fully understand the effect of magnetic induction intensity produced by rock compression,a magnetic core of Nd-Fe-B was implanted into cylindrical marble specimen and cylindrical limestone specimen,respectively,to produce magnetic field around the specimen.Three variables tests,including stress-strain-magnetic induction intensity,were carried out in the process of rock compression by means of the change of magnetic circuit and magnetic induction intensity due to rock fracture.Experimental results show that the variation of magnetic induction intensity around the rock is caused by the change of rock internal fissure,and there are corresponding numerical relations among the stress-strain-magnetic induction intensity.Before arriving the critical maximum stress,the abnormal increase of magnetic induction intensity around the marble and the limestone spesimens occurs respectively,which is an omen of rock disruption.During the rock disruptive stage,there is a definite anti-symmetry in the change of stress-strain curve and the change of magnetic induction intensity-strain curve.The rock stress-magnetic induction intensity relational expression was obtained by segmentally fitting.
In order to fully understand the effect of magnetic induction intensity produced by rock compression,a magnetic core of Nd-Fe-B was implanted into cylindrical marble specimen and cylindrical limestone specimen,respectively,to produce magnetic field around the specimen.Three variables tests,including stress-strain-magnetic induction intensity,were carried out in the process of rock compression by means of the change of magnetic circuit and magnetic induction intensity due to rock fracture.Experimental results show that the variation of magnetic induction intensity around the rock is caused by the change of rock internal fissure,and there are corresponding numerical relations among the stress-strain-magnetic induction intensity.Before arriving the critical maximum stress,the abnormal increase of magnetic induction intensity around the marble and the limestone spesimens occurs respectively,which is an omen of rock disruption.During the rock disruptive stage,there is a definite anti-symmetry in the change of stress-strain curve and the change of magnetic induction intensity-strain curve.The rock stress-magnetic induction intensity relational expression was obtained by segmentally fitting.
引文
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[9]葛修润.岩石疲劳破坏的变形控制律、岩土力学试验的实时X射线CT扫描和边坡坝基抗滑稳定分析的新方法[J].岩土工程学报,2008,30(1):1-20(GE Xiu-run.Deformation control law of rock fatigue failure,real-timeX-ray CT scan of geotechnical testing,and new method of stability analysis of slopes and dam foundations[J].Chinese Journal of Geotechnical Engineering,2008,30(1):1-20(in Chinese))
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[11]Chen G,Lin Y.Stress-Strain-Electrical Resistance Effects and Associated State Equations for Uniaxial RockCompression[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(2):223-236
[2]钱书清,郝锦绮,周建国等.岩石受压破裂的ULF和LF电磁前兆信号[J].中国地震,2003,19(2):109-116(QIAN Shuqing,HAO Jinqi,et al.Precursory Electric and Magnetic Signals at ULF and LF Bands during theFracture of Rocks under Pressure[J].Earthquake Research in China,2003,19(2):109-116(in Chinese))
[3]王立凤,王继军,陈小斌等.岩石破裂电磁辐射(EMR)现象实验研究[J].地球物理学进展,2007,22(3):715-719(WANG Li-feng,WANG Ji-jun,et al.Experimental and theoretical investigations of electromagneticradiation induced by rock fracture[J].Progress in Geophysics,2007,22(3):715-719(in Chinese))
[4]Sorokin V M,Chmyrev V M,Yaschenko A K.Ionospheric generation mechanism of geomagnetic pulsationsobserved on the Earth’s surface before earthquake[J].Journal of Atmospheric and Solar-Terrestrial Physics,2003,64:21-29.
[5]Laurent Louis,Tzu-Mo Natalie Chen,Christian David,et al.Anisotropy of magnetic susceptibility and P-wavevelocity in core samples from the Taiwan Chelungpu-Fault Drilling Project(TCDP)[J].Journal of StructuralGeology,2008,30:948-962.
[6]王世昌,郅红魁,宋建锁.地震孕育过程中地磁日变规律的分析[J].地震地磁观测与研究,2004,25(5):18(WANGShichang,ZHI Hongkui,SONG Jiansuo.The analysis of regularity of geomagnetic daily variation during earthquakepreparation[J].Seismological and Geomagnetic Observation and Research,2004,25(5):18-23(in Chinese))
[7]纪洪广,侯昭飞,张磊等.载荷岩石材料在加载-卸载扰动作用下声发射特性[J].北京科技大学学报,2011,33(1):1-5(JI Hong-guang,HOU Zhao-fei,ZHANG Lei,et al.Acoustic emission character of loaded rockunder load-unload disturbance[J].J.Univ.Sci.Technol.Beijing,2011,33(1):1-5(in Chinese))
[8]张黎明,王在泉,石磊等.不同应力路径下大理岩破坏过程的声发射特性[J].岩石力学与工程学报,2012,31(6):1230-1236(ZHANG Liming,WANG Zaiquan,SHI Lei,et al.Acoustic Emission Characteristics of MarbleDuring Failure Process under Different Stress Paths[J].Chinese Journal of Rock Mechanics and Engineering,2012,31(6):1230-1236(in Chinese))
[9]葛修润.岩石疲劳破坏的变形控制律、岩土力学试验的实时X射线CT扫描和边坡坝基抗滑稳定分析的新方法[J].岩土工程学报,2008,30(1):1-20(GE Xiu-run.Deformation control law of rock fatigue failure,real-timeX-ray CT scan of geotechnical testing,and new method of stability analysis of slopes and dam foundations[J].Chinese Journal of Geotechnical Engineering,2008,30(1):1-20(in Chinese))
[10]郝圣旺,孙菊.岩石变形演化诱致灾变破坏过程的同步实验观测[J].实验力学,2008,23(1):89-95(HAOSheng-Wang,SUN Ju.The Synchronous Observations on Deformation Localization Induced Catastrophic Ruptureof Rock[J].Journal of Experimental Mechanics,2008,23(1):89-95(in Chinese))
[11]Chen G,Lin Y.Stress-Strain-Electrical Resistance Effects and Associated State Equations for Uniaxial RockCompression[J].International Journal of Rock Mechanics and Mining Sciences,2004,41(2):223-236
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