岩石破坏动态变形场观测系统及应用

基于高速图像采集设备和数字散斑相关方法（DSCM），建立了一套岩石破坏动态变形场观测实验系统，介绍了系统的组成和原理，重点阐述了用于岩石动态变形测量时光源的选择、采集速率的设置和图像采集的触发等关键技术。用此动态变形场观测实验系统可完成动（静）态载荷作用下岩石破坏瞬间试件表面图像的准确高速采集，并进一步完成变形场的定量分析。用设计的系统完成了岩石巴西圆盘实验和岩石I型裂纹动态断裂实验，对动态变形场观测实验系统的可行性和有效性进行了验证。观测系统获得的脆性岩石失稳破坏过程中动态、定量的变形场数据可为深入研究岩石失稳破坏机理提供基础的数据和认识。

Dynamic deformation field measurement system for rock failure and its application

A dynamic deformation field measurement system based on high-speed image capturing devices and digital speckle correlation method (DSCM) is established to measure the dynamic deformation of rock specimens. The principle and elements of the system are introduced. Among them, the choice of special light sources, the setting of the imaging acquisition rate and the triggering techniques for high-speed camera capturing are described as the key techniques for dynamic deformation measurement of rock. The dynamic deformation field measurement system can accurately capture the high-speed images and then obtain the quantitative deformation fields for a rock specimen subjected to either quasi-static or dynamic loadings. Two experiments, a Brazilian disc test and a dynamic mode-I crack fracture test, are performed to verify the feasibility and effectiveness of the measurement system. The quantitative dynamic deformation fields during the failure procedure of brittle rock obtained by the dynamic deformation field measurement system may provide solid experimental support for intensive study of rock failure mechanism.