Influence of stress wave amplitude on rock fracturing process and failure pattern in the Brazilian tensile tests

摘要

Dynamic fracturing process analysis of rock material under the Brazilian tensile test condition is conducted using RFPA~(2D). The analysis aims to investigate the influence of applied stress wave amplitude on the fracturing process and failure induced in the rock material. Heterogeneity of the rock materials is taking into account and its influence on stress wave propagation is first discussed. Then, the dynamic failure process analyses are extended to investigate the influence of waveforms in terms of stress wave amplitude on failure modes. These simulations reveal that the failure modes are affected strongly by the stress wave amplitude. Stress wave of higher amplitude generates fracturing earlier. Consequently, the high wave amplitude leads to intense fracture initiation near the loading point, whereas lower amplitude leads to intense fracture initiation near the bottom where wave is reflected. The observation obtained from the simulations provides a new insight on the fracturing and failure mechanism of rock under the dynamic Brazilian tensile test. The simulation also shows that RFPA has the potential to simulate and study material failure under dynamic loading conditions.