In order to explore the breakage mechanism and crack expansion pattern of concrete under jet impact,a numerical model of abrasive water jet impacting concrete was constructed based on smooth parti-cle hydrodynamics(SPH)method.The relationship of stress propagation and breakage mode inside con-crete,abrasive volume fraction and porosity of concrete with crack length,failure particle number,pit depth and pit diameter was investigated.It is indicated that cracks have strong hindering effect on stresses,and the superposition of reflections with boundary stress waves cause stress concentration in some regional,forming the central microcracks and internal broken blocks.The crack length increased by nearly 2.30 times,the number of failed particles by 3.38 times,and the pit depth value by 4.00 times,with abrasive volume fraction of 20％compared to 0％,indicating that the addition of abrasives to the jet substantially increased the breakage effect.The greater porosity of concrete is,the more diffuse cracks distribute,the lar-ger of damage area,the greater of damage degree,and the greater fractal dimension are,indicating that po-rosity reduces the concrete compressive strength and that materials with large porosity are more prone to breakage.
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