基于颗粒离散元法岩石压缩过程破裂机制宏细观研究

Macro-micro mechanical research on failure mechanism of rock subjected to compression loading based on DEM

为了研究岩石在压缩荷载作用下的破裂机制,基于颗粒离散元法,对岩石压缩荷载作用下内部颗粒组分的宏细观力学响应进行研究,得到岩石压缩破坏过程中颗粒旋转弧度、颗粒间接触力、颗粒竖向位移以及细观裂纹的演化过程。研究结果表明:岩石宏观破裂过程是在外部荷载作用下,内部组分之间相互作用导致的岩石试件由静态到动态、由局部到整体、由细观到宏观的不断演化的过程,并最终形成宏观上的破裂带。研究结果从细观层面揭示岩石的破裂机制,对岩体工程稳定性的评价、地质灾害发生的预测等具有参考价值。

In order to research the failure mechanism of rock under the compression loading, the macroscopic and microscopic mechanical response of internal grains in rock sample under the compression loading was studied based on the discrete element methods（DEM）. The evolution processes of particle＇s rotation radian, the contact force among particles and particle＇s vertical displacement as well as microscopic cracks during the failure process under the compression loading were obtained. The results show that the macroscopic failure process of rock is an evolution process of rock from static to dynamic, from part to whole, from microscopic level to macroscopic level, which is resulted from the interaction of internal grains under compression loading. Finally, the macroscopic fracture zone is formed. The failure mechanism of rock at the microscopic level is revealed. It has reference value to evaluate the stability of rockmass engineering and to forecast the occurrence of geological disaster.