数字散斑相关方法用于岩石结构破坏过程观测

Observation of failure procedure of rock structure using digital speckle correlation method

介绍了数字散斑相关方法(DSCM)的基本原理及用 DSCM 进行岩石力学实验观测的观测系统,用此系统进行了一个岩石圆孔结构变形破坏过程的变形场观测,实验结果显示了此种岩石结构的复杂破坏过程。岩石结构的破坏经历损伤的积累及局部化过程,结构最终沿某一局部化带发生宏观破坏,但局部化带的演化在时间和空间上均不稳定,甚至存在跳跃与竞争现象。

The essential principle of digital speckle correlation method (DSCM) and the hardware system for experimental measurement of rock materials using DSCM are firstly introduced, then the failure process of a rock structure is observation using the system. The experimental results show that the failure procedure of rock structure undergoes damage accumulation and localization. Despite the fact that the macro crack of the structure after failure could be corresponding to the final state of the localization evolution, the process of the localization evolution is rather complicated, either of spatial or temporal.