含孔洞岩石单轴压缩下变形破裂规律的实验研究  

EXPERIMENTAL INVESTIGATION ON THE DEFORMATION AND CRACK BEHAVIOR OF ROCK SPECIMEN WITH A HOLE UNDERGOING UNIAXIAL COMPRESSIVE LOAD

作　　者：刘招伟[1] 李元海[2] 

机构地区：[1]洛阳理工学院岩土与地下工程研究所,河南洛阳471023 [2]中国矿业大学深部岩土力学与地下工程国家重点实验室,江苏徐州221008

出　　处：《工程力学》2010年第8期133-139,共7页Engineering Mechanics

基　　金：教育部科学技术研究重点项目(106085)

摘　　要：采用数字散斑相关量测方法(DSCM)和数字照相量测软件系统PhotoInfor,通过观测表面位移场、应变场及总体变形在整个加载过程中的变化特点,对大小为100mm×100mm×100mm的含有孔洞的岩石试件在单轴压缩下的变形破裂演变规律进行了实验研究。结果表明:1)DSCM方法能够对岩石变形破裂的特点进行全程有效捕捉,有助于加深对岩石变形局部化过程的全面认识;2)含孔洞岩石试件局部化变形起始于峰值点处轴向位移的80%处,应力峰值点附近变形局部化最为剧烈;3)岩石表面平均最大剪应变随轴向位移的变化曲线,总体上能够很好地反映岩石变形破裂的演变过程和规律,可作为分析岩石变形演变的一个参考特征参数。The digital speckle correlation method （DSCM） and the software package PhotoInfor have been adopted to conduct an experimental investigation on the deformation and crack behaviours through a uniaxial compressive test on a rock specimen of 100mm×100mm×100mm with a hole. DSCM was used to measure the deformation fields of displacement and strain, and to observe the general average deformation on the whole specimen surface during the test. The results show that： 1） the deformation process of rock specimen during the test can be captured and better understood by DSCM; 2） the local deformation occurs when the axial compressive displacement reachs to 80% of the total displacement at peak load point, and the characteristics of deformation localization is the strongest near the peak load, and 3） the curves of average maximum shear strains and axial compressive displacement on the specimen have an obvious relationship with the evolution of deformation and crack on rock specimen, and these can provide some significant reference for studying the local deformation characters of rock undergoing compressive loads.

关 键 词：数字散斑相关 岩石试件 裂隙 局部化变形 图像分析 

分 类 号：TU458.3[建筑科学—岩土工程]