The underwater explosion process of mines lying on seabed was simulated by using the meshfree SPH method. And the substance interfaces were treated by adopting the impedance matching method. The reflection coefficients of the peak pressures in different directions at different distances from the explosion center were obtained. The distribution and change of the explosion field parameters were analyzed. And the effects of different sand thickness and different charge mass on shock wave propagation and pressure were discussed. Simulation results show that the seabed reflection coefficient varies with the angle between measuring points and horizontal line and it arrives at the maximum value of 1. 5 when the angle is about 55 degree. It is helpful for determining the explosion load of mines lying on seabed.%采用冲击波物理中的阻抗匹配镜像线方法处理物质交界面,利用无网格光滑粒子流体动力学法(smoothed particle hydrodynamics,SPH)方法模拟沉底装药的水下爆炸过程,得到了不同方向不同爆距处的峰值压力反射系数,分析了爆炸流场参量分布和变化规律,研究了不同水底砂层厚度和不同装药量对爆炸冲击波传播和流场中压力的影响.结果表明:海底反射系数随测点与水平线夹角的变化而变化,当测点与水平线夹角为约55°时反射系数最大,其最大值可达1.5.本文的研究可为沉底水雷爆炸载荷的确定提供参考.
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