基于DIC类岩石材料损伤演化研究  

Study on the Single Crack Propagation and Damage Evolution Characteristics of Rock Materials Based on DIC

作　　者：徐丽海 邓建华[1] 王玲玲 XU Lihai;DENG Jianhua;WANG Lingling(College of Civil Engineering,Guizhou University,Guiyang 550003,China)

机构地区：[1]贵州大学土木工程学院,贵州贵阳550003

出　　处：《贵州大学学报（自然科学版）》2018年第3期110-115,共6页Journal of Guizhou University:Natural Sciences

基　　金：国家自然科学基金项目(51068003);贵州省科技厅基金项目(黔科合J字[2011]2324号)

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.

关 键 词：新型类岩石材料 三维数字图像方法 散斑损伤变量 裂纹扩展 

分 类 号：TU45[建筑科学—岩土工程]