基于数字图像相关技术的岩样破坏实验的应用研究

为了解喀喇昆仑公路（中国段）沿线岩石裂纹演化及受力后的力学性能（位移和应变），采用数字图像相关技术，对三点弯曲加载条件下的灰白石英粉砂岩和片麻岩试件在万能试验机上进行了破坏实验，得到了外力作用下裂纹生成、扩展等演化过程及两种岩样在加载直至破坏过程中的位移场和平均应变曲线．实验结果表明，在相同条件下，灰白石英粉砂岩比片麻岩更易脆断，片麻岩在受力断裂破坏时出现了多条裂纹，导致试件加剧断裂，研究成果为了解这一地域的岩石强度及破坏规律提供了实验依据．

Research on the Application of Rock Failure Experiment Based on Digital Image Correlation Technology

In order to understand the crack evolution and mechanical properties (displacement and strain) of rocks along the Karakoram Highway (China Section), Digital Image Correlation technology (DIC) is used for the fracture experiments of gray quartz siltstone and gneiss under the loading condition of three-point bending. The crack formation and evolution process of rock specimen under the external force were explored, and the displacement field and the average strain curve of the two rock specimens during the loading process up to the failure were obtained. The experimental results show that under the same loading conditions, the gray white quartz siltstone is more brittle than the gneiss, and many cracks appear and accelerate the fracture of gneiss under the external force. This paper can provide experimental reference for understanding the rock strength and failure law in this area.