In order to study the failure pattern of dams under extended charges

a numerical model based on multi-material ALE method is used to simulate a dam-blasting test

and to analyze the propagation of blast-induced stress waves within soil and the variation of soil density.The results show that the entire evolution process of dam-break induced by explosions can be reproduced by using a MM-ALE model

and the numerical results have good agreement with the experimental data.The repeated superposition of compressional waves and reflection rarefaction waves near the free surface of dam slope and crest is a critical factor in forming blasting burst.The evolution of blast-induced crater exhibits an evident hysteresis relative to the propagation of blasting stress waves.Three regions of the dam are divided after blasting

i.e.

cavity zone

compaction zone and undisturbed zone.Densification belt near the crater can prevent continuous vertical incision caused by water erosion and intermittent horizontal expansion caused by collapse or instability of dyke slope.Local compaction induced by blasting plays an important role in keeping global stability of the dam after blasting.The results can provide reference for blasting demolition of embankments or landslide dams.