In order to increase cavity diameter and meet the penetration depth requirement of jet penetration into concrete, a double-layered liner that could form a jacketed jet was designed. Moreover, three types of penetration modes during the process of jacketed jet penetration into concrete, including homogeneous jet penetration, "bi-erosion" and "co-erosion", were discussed. Thus, an analytical model for predicting the crater size generated by jacketed jet penetration into concrete is presented. The X-ray measurement show that the state of jacketed jet is fine, and the jet diameter increases with thickness increase of aluminum liner. Penetration experiments show that cavity diameter increases with thickness increase of aluminum liner, and penetration depth agrees with the requirement. The hole profile calculated with the analytical model is in good agreement with the experimental data.
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