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Abstract Three-point bending beam with offset notch is usually used to study the mixed I–II crack propagation in rock. Rock failure process analysis(RFPA) code is used to study the failure process of three-point beam with offset notch when subjected to dynamic loading，the effect of position of offset notch(denoting with g ) on the failure patterns is investigated. The numerical results are shown as follows：(1) when g ≤0.745，it is the propagation of offset crack in upward direction that leads to final fracture of the specimen；(2) and when g ＞0.745，the fracture of the beam is due to the newly formed crack at the middle span although the pre-existing offset crack also propagates upwards. The two typical failure patterns as well as the critical value of g，which are obtained from the numerical simulations，agree well with the experimental observations.
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Received: 19 April 2007
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