Effect of precrack length and inclination on tensile failure behaviour of heterogeneous rocks

摘要

The failure behaviour of heterogeneous rock specimens with prefabricated single crack underndirect tensile loading is investigated numerically by using an elastoplastic cellular automatonn(EPCA2D) model. The response of tensile failure behaviour of heterogeneous rocks is investigatednwhen different crack lengths and inclinations are used. The results confirm that the tensilenstrength of rock specimens presents a tendency of reduction with the increment of crack length atnsame fixed crack inclination. However, this reduction changes non-monotonically due to thenheterogeneity of rocks. Only the precrack is longer enough can it be the main factor of rock failure.nWith the same crack length, but different crack inclinations, the tensile strength increases with thenincrement of crack inclination. With the increment of the angle between precrack and tensilenloading direction, the effect of the precrack on tensile failure behaviour of rock decreases.