基于数字散斑相关方法的虚拟引伸计及其在岩石裂纹动态观测中的应用
|
摘要
基于数字散斑相关方法(DSCM)发展了一种虚拟引伸计测量方法。该方法通过DSCM测量的应变场识别和定位裂纹,然后"事后"在裂纹处虚拟地安装引伸计,再通过DSCM测量的位移场计算裂纹的张开量和错动量。给出了虚拟引伸计的原理和实现方法,并用实验验证了虚拟引伸计的可靠性,同时分析并标定出虚拟引伸计在实测中可达到0.1像素的分辨率。将虚拟引伸计应用于含未穿透预制裂纹(三维裂纹)的花岗岩试件的破坏实验中,根据虚拟引伸计测得的裂纹张开、错动情况,对试件破坏过程中不同裂纹的出现顺序以及裂纹类型进行了判断,同时对试件破坏的机制进行了简单分析。
The virtual extensometer is developed based on digital speckle correlation method(DSCM).To realize the virtual extensometer,the cracks on the specimen are firstly identified and located using the strain fields measured by DSCM.Then,virtual extensometers are installed on the cracks.Finally,the opening and the dislocation of the cracks are calculated through the displacement fields.The principle and realization of the virtual extensometer are introduced.The reliability of virtual extensometer is verified by a specially designed experiment and the resolution of virtual extensometer is calibrated as 0.1 pixels.This virtual extensometer is applied to an experiment to study the failure procedure of a granite specimen containing non-penetrating crack(three-dimensional crack).The type and sequence-by-time of cracks on the specimen are determined based on the measurement results from the virtual extensometer.The failure mechanism of the specimen is then analyzed.
The virtual extensometer is developed based on digital speckle correlation method(DSCM).To realize the virtual extensometer,the cracks on the specimen are firstly identified and located using the strain fields measured by DSCM.Then,virtual extensometers are installed on the cracks.Finally,the opening and the dislocation of the cracks are calculated through the displacement fields.The principle and realization of the virtual extensometer are introduced.The reliability of virtual extensometer is verified by a specially designed experiment and the resolution of virtual extensometer is calibrated as 0.1 pixels.This virtual extensometer is applied to an experiment to study the failure procedure of a granite specimen containing non-penetrating crack(three-dimensional crack).The type and sequence-by-time of cracks on the specimen are determined based on the measurement results from the virtual extensometer.The failure mechanism of the specimen is then analyzed.
引文
[1]马瑾,张渤涛,袁淑荣.断层闭锁区附近应变场演化的初步探讨[J].地震地质,1979,1(3):47-55.MA Jin,ZHANG Bo-tao,YUAN Shu-rong,et al.Preliminary study on the evolution of strain field nearlocked region of a fault[J].Seismology and Geology,1979,1(3):47-55
[2]刘力强,马瑾,吴秀泉.雁列式断层变形与失稳过程的实验研究[J].地震学报,1986,8(4):393-403.LIU Li-qiang,MA Jin,WU Xiu-quan.An experimentalstudy on the process of deformation and instability foren-echelon faults[J].Acta Seismologica Sinica,1986,8(4):393-403.
[3]马胜利,刘立强,马瑾,等.雁列式断层变形过程中物理场演化的实验研究[J].地震地质,1995,17(4):327-335.MA Sheng-li,LIU Li-qiang,MA Jin,et al.Experimentalstudy on evolution of physical field during deformation ofen-echelon faults[J].Seismology and Geology,1995,17(4):327-335.
[4]MA S P,ZHAO Y H,JIN G C.Geo-DSCM system and itsapplication to deformation measurement of rockmechanics[J].Int.J.Rock Mech.&Min.Sci.,2004,41(3):411-412.
[5]马少鹏,金观昌,潘一山.岩石材料基于天然散斑场的变形观测方法研究[J].岩石力学与工程学报,2002,21(6):792-796.MA Shao-peng,JIN Guan-chang,PAN Yi-shan.Deformation measurement method for rock materialsbased on natural speckle pattern[J].Chinese Journal ofRock Mechanics and Engineering,2002,21(6):792-796.
[6]马少鹏,赵永红,金观昌,等.光测方法在岩石力学实验观测中的应用述评[J].岩石力学与工程学报,2005,(10):1794-1799.MA Shao-peng,ZHAO Yong-hong,JIN Guan-chang,et al.Review on application of optical measurement methods toexperiment inspection of rock mechanics[J].ChineseJournal of Rock Mechanics and Engineering,2005,(10):1794-1799.
[7]LIU L Q,LIU P X,WONG R H C,et al.Experimentalresearch of 3D extension process of faultage[J].Sciencein China,2008,(7):833-841.
[8]SUTTON M A,MCNEILL S R,HELM J D,et al.Advances in two-dimensional and three-dimensionalcomputer vision[C]//Topics in Applied Physics.Berlin:Springer,1999.
[9]SUTTON M A.Digital Image correlation for shape anddeformation measurements[C]//Springer Handbook ofExperimental Solid Mechanics.Berlin:Springer,2008:565-598.
[10]WONG R H C,HUANG M L,JIAO M R,et al.Themechanisms of crack propagation from surface 3Dfracture under uniaxial compression[J].InternationalJournal of Rock Mechanics and Mining Sciences,2004,261:219-224.
[11]WONG R H C,LAW C M,CHAU K T,et al.Crackpropagation from 3-D surface fractures in PMMA andmarble specimens under uniaxial compression[J].Int.J.of Rock Mech.&Min.Sci.,2004,41(3):360-366.
[12]郭彦双,黄凯珠,朱维申,等.辉长岩中张开型表面裂隙破裂模式研究[J].岩石力学与工程学报,2007,26(3):525-531.GUO Yan-shuan,HUANG Kai-lin,ZHU Wei-shen,et al.Study on fracture pattern of open surface-flaw ingabbro[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(3):525-531.
[2]刘力强,马瑾,吴秀泉.雁列式断层变形与失稳过程的实验研究[J].地震学报,1986,8(4):393-403.LIU Li-qiang,MA Jin,WU Xiu-quan.An experimentalstudy on the process of deformation and instability foren-echelon faults[J].Acta Seismologica Sinica,1986,8(4):393-403.
[3]马胜利,刘立强,马瑾,等.雁列式断层变形过程中物理场演化的实验研究[J].地震地质,1995,17(4):327-335.MA Sheng-li,LIU Li-qiang,MA Jin,et al.Experimentalstudy on evolution of physical field during deformation ofen-echelon faults[J].Seismology and Geology,1995,17(4):327-335.
[4]MA S P,ZHAO Y H,JIN G C.Geo-DSCM system and itsapplication to deformation measurement of rockmechanics[J].Int.J.Rock Mech.&Min.Sci.,2004,41(3):411-412.
[5]马少鹏,金观昌,潘一山.岩石材料基于天然散斑场的变形观测方法研究[J].岩石力学与工程学报,2002,21(6):792-796.MA Shao-peng,JIN Guan-chang,PAN Yi-shan.Deformation measurement method for rock materialsbased on natural speckle pattern[J].Chinese Journal ofRock Mechanics and Engineering,2002,21(6):792-796.
[6]马少鹏,赵永红,金观昌,等.光测方法在岩石力学实验观测中的应用述评[J].岩石力学与工程学报,2005,(10):1794-1799.MA Shao-peng,ZHAO Yong-hong,JIN Guan-chang,et al.Review on application of optical measurement methods toexperiment inspection of rock mechanics[J].ChineseJournal of Rock Mechanics and Engineering,2005,(10):1794-1799.
[7]LIU L Q,LIU P X,WONG R H C,et al.Experimentalresearch of 3D extension process of faultage[J].Sciencein China,2008,(7):833-841.
[8]SUTTON M A,MCNEILL S R,HELM J D,et al.Advances in two-dimensional and three-dimensionalcomputer vision[C]//Topics in Applied Physics.Berlin:Springer,1999.
[9]SUTTON M A.Digital Image correlation for shape anddeformation measurements[C]//Springer Handbook ofExperimental Solid Mechanics.Berlin:Springer,2008:565-598.
[10]WONG R H C,HUANG M L,JIAO M R,et al.Themechanisms of crack propagation from surface 3Dfracture under uniaxial compression[J].InternationalJournal of Rock Mechanics and Mining Sciences,2004,261:219-224.
[11]WONG R H C,LAW C M,CHAU K T,et al.Crackpropagation from 3-D surface fractures in PMMA andmarble specimens under uniaxial compression[J].Int.J.of Rock Mech.&Min.Sci.,2004,41(3):360-366.
[12]郭彦双,黄凯珠,朱维申,等.辉长岩中张开型表面裂隙破裂模式研究[J].岩石力学与工程学报,2007,26(3):525-531.GUO Yan-shuan,HUANG Kai-lin,ZHU Wei-shen,et al.Study on fracture pattern of open surface-flaw ingabbro[J].Chinese Journal of Rock Mechanics andEngineering,2007,26(3):525-531.
版权所有：© 2023 中国地质图书馆 中国地质调查局地学文献中心