Numerical simulation on failure modes of rock bars under different wave lengths

The principle of RFPA to simulate dynamic failure of rock was briefly summarized.RFPA was used to study the dynamic spalling process of homogenous and heterogeneous rock specimens under different wave lengths.The numerical simulation reproduced different failure modes of homogeneous rock under the compressive stress wave with different wave lengths,Numerical results agreed well with the theoretical ones,which proved that RFPA was effective in simulating the dynamic fracture of rock,then RFPA was used to simulate the spalling failure of heterogeneous rock bar subjected to stress waves with different wave lengths,and four failure patterns were numerically obtained.The different failure modes of the homogeneous and the heterogeneous rock specimens were also presented.These failure patterns were related with not only the strength of fragment but also the duration of load applied on the specimens.And the fractures of rock bars was not only connected with the magnitude and length of stress waves but also the heterogeneity.