Numerical simulation of linear shaped charge on rock cutting

Numerical simulation of the formation of metal jet and the process of jet penetration into rock was conducted by using the modified MOCL program to investigate the mechanism, process and dynamic condition of linear shaped charge blast cutting rock. The detonation offspring bloating, charge cover deformation jet formation process at cone angle of 60° and the distribution of jet velocity gradient with cone angle of 60° and 90° were obtained. The distribution figures reveal that the cone angle of 60° cumulative jet speed has the trend of becoming smaller at different time of jets during the process of being stretched, the speed gradient is bigger and the head speed is 4 500 m/s. The cumulative jet head speed of cone angle of 90° is 3 500 m/s, the speed gradient is smaller, the head speed is smaller than that of cone angle of 60°. This is corresponding to the practical physical process. On-the-spot experiments on rock cutting show that simulation results are in agreement with physical phenomena and laws of shaped jet. The physical model and numerical algorithm used for the simulation are reasonable.