基于DIC类岩石材料损伤演化研究
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摘要
本文研究了一种新型的类岩石材料的配比,同时在采用了新的散斑制作技术能够更精确更方便地制作更好的散斑。进一步通过室内模型试验,利用三维数字图像相关方法(3D-DIC)的研究手段,观测不同倾角预置单裂纹的类岩石材料在单轴压缩下的裂纹扩展及岩体细观损伤演化过程,得到预制单裂纹类岩石破坏过程中观测面的三维全场位移和应变。提出了一种基于散斑数量变化的散斑损伤变量来量化岩石的损伤。结果表明:裂纹倾角是影响预制单裂纹的岩石起裂应力、抗压强度等力学特性的重要参数;散斑损伤变量能很好地对应变场的损伤演化,且岩石材料破坏过程中应变场的演化能较好地反映其内部裂纹的产生和扩展规律;所以利用3D-DIC观测系统进行岩石变形破坏机制的研究是有效的,可为岩土介质宏细观变形破坏机制的研究提供重要的借鉴。
In this paper,a new type of rock material matching was studied,and the new speckle technique can be used to make better speckle. Further through the laboratory experiments,the 3 D digital image correlation method( 3 d-dic) was used to observe the crack propagation and the evolution process of rock mass microscopic damage under uniaxial compression of the class rock materials with preset single cracks of different dip angles,and the three-dimensional total displacement and strain of the observation surface in the process of prefabricated single crack rock failure were obtained. A kind of change was proposed based on the number of speckle damage variable to quantify the damage of rock. The results show that the precast single crack rock crack stress,compressive strength and other mechanical properties were closely associated with the crack Angle; The damage evolution of the strain field can be very good for the speckle damage variable,and the evolution of the strain field in the process of rock material failure can better reflect the formation and expansion of internal cracks. Therefore,it is effective to study the mechanism of rock deformation and failure by using the 3 D-DIC observation system,which can provide important reference for the study of the mechanism of macroscopic deformation and failure of geotechnical media.
In this paper,a new type of rock material matching was studied,and the new speckle technique can be used to make better speckle. Further through the laboratory experiments,the 3 D digital image correlation method( 3 d-dic) was used to observe the crack propagation and the evolution process of rock mass microscopic damage under uniaxial compression of the class rock materials with preset single cracks of different dip angles,and the three-dimensional total displacement and strain of the observation surface in the process of prefabricated single crack rock failure were obtained. A kind of change was proposed based on the number of speckle damage variable to quantify the damage of rock. The results show that the precast single crack rock crack stress,compressive strength and other mechanical properties were closely associated with the crack Angle; The damage evolution of the strain field can be very good for the speckle damage variable,and the evolution of the strain field in the process of rock material failure can better reflect the formation and expansion of internal cracks. Therefore,it is effective to study the mechanism of rock deformation and failure by using the 3 D-DIC observation system,which can provide important reference for the study of the mechanism of macroscopic deformation and failure of geotechnical media.
引文
[1]刘晓丽,王思敬,王恩志,等.单轴压缩岩石中缺陷的演化规律及岩石强度[J].岩石力学与工程学报,2008,27(6):1 195-1201.
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[7]纪维伟,潘鹏志,苗书婷,等.基于数字图像相关法的两类岩石断裂特征研究[J].岩土力学,2016,37(08):2299-2305.
[8]代树红,马胜利,潘一山.数字图像相关法测定岩石Ⅰ-Ⅱ复合型裂纹应力强度因子[J].岩土工程学报,2013,35(07):1362-1368.
[9]代树红,马胜利,潘一山,等.基于数字散斑相关方法测定Ⅰ型裂纹应力强度因子[J].实验力学,2013,28(02):269-276.
[10]代树红,马胜利,潘一山,等.数字散斑相关方法测定岩石Ⅰ型应力强度因子[J].岩石力学与工程学报,2012,31(12):2501-2507.
[11]YAMAGUCHI I.A laser-speckle strain gage[J].Journal of Physis E:Scientific Instruments,1981,14:1270-1273.
[12]LUO P F,CHAO Y J,SUTTON M A,et al,Accurate measurement of three-dimensional deformations in deformale and rigid bodies using computer vision[J].Experimental Mechanics,1993,33(2):123-132.
[13]潘兵,谢惠民,李艳杰.用于物体表面形貌和变形测量的三维数字图像相关方法[J].实验力学,2007,22(6):556-567.
[2]JAGER J C,COOK N G W.岩石力学基础[M].中国科学院工程力学研究所,译.北京:科学出版社,1983:276-278.
[3]潘一山.冲击地压发生和破坏过程研究[D].北京:清华大学,1999.
[4]马少鹏.数字散斑相关方法在岩石破坏测量中的发展与应用[D].北京:清华大学,2003.
[5]朱维申,陈卫忠,申晋.雁形裂纹扩展的模型试验及断裂力学机制研究[J].固体力学学报,1998,19(4):354-360.
[6]李博,吴润江,高为超.岩石损伤软化的修正本构模型[J].地震工程学报,2016,38(5):783-786.
[7]纪维伟,潘鹏志,苗书婷,等.基于数字图像相关法的两类岩石断裂特征研究[J].岩土力学,2016,37(08):2299-2305.
[8]代树红,马胜利,潘一山.数字图像相关法测定岩石Ⅰ-Ⅱ复合型裂纹应力强度因子[J].岩土工程学报,2013,35(07):1362-1368.
[9]代树红,马胜利,潘一山,等.基于数字散斑相关方法测定Ⅰ型裂纹应力强度因子[J].实验力学,2013,28(02):269-276.
[10]代树红,马胜利,潘一山,等.数字散斑相关方法测定岩石Ⅰ型应力强度因子[J].岩石力学与工程学报,2012,31(12):2501-2507.
[11]YAMAGUCHI I.A laser-speckle strain gage[J].Journal of Physis E:Scientific Instruments,1981,14:1270-1273.
[12]LUO P F,CHAO Y J,SUTTON M A,et al,Accurate measurement of three-dimensional deformations in deformale and rigid bodies using computer vision[J].Experimental Mechanics,1993,33(2):123-132.
[13]潘兵,谢惠民,李艳杰.用于物体表面形貌和变形测量的三维数字图像相关方法[J].实验力学,2007,22(6):556-567.