线性聚能装药切割岩石的数值模拟

Numerical Simulation of Linear Shaped Charge on Rock Cutting

运用改进的MOCL程序,数值模拟了线性聚能装药金属射流的形成以及射流侵彻岩石的全过程,得到了锥角为60°的聚能装药结构爆轰产物膨胀、药型罩变形、射流形成过程及锥角为60°和90°时的射流速度梯变分布。不同时刻射流的分布显示,在拉伸过程中,锥角为60°的聚能射流速度变小,速度梯度较大,头部速度为4500m·s-1;锥角为90°的聚能射流,头部速度为3500m·s-1速度梯度较小,与实际物理过程相一致。结果表明,模拟结果基本符合聚能射流的物理现象和规律,说明采用的物理模型和数值算法是合理的。

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.