viscoelasticity;  heterogeneous cracks;  fracture analysis;  Stress intensity factor

Aiming at the cumbersome problem of calculating the interface cracks of the heteroelastic mold by the finite element method, the variation law of stress intensity factors of the interface cracks in the heel area of gravity dams under the action of earthquakes was discussed by the special solution boundary element method, and it was concluded that the stress intensity factors KI., KII., and K0 decreased with the increase of the elastic-mold ratio and increased with the increase of fracture length, and the ground water pressure had a greater influence on the cracks of gravity dams. The example shows that the special solution boundary element method is an effective method for calculating the dynamic fracture of heterogeneous fractures.