中文摘要：

为了探索锯齿形拖拽体在颗粒中平动运动时所受阻力和升力的变化规律，利用颗粒离散元数值模拟的方法，对不同的锯齿倾角、侵入深度、运动速度以及边界条件情况下的拖拽体进行了比较全面的分析研究。结果表明，锯齿倾角越大，阻力和升力越大，侵入深度越大和速度越大，阻力越大。最后，建立了拖拽阻力的建议公式，实际归一化结果表明，锯齿倾角一定时，就可以确定相应参数，进而表达不同拖拽速度和不同侵入深度时的拖拽阻力。

英文摘要：

In order to investigate the drag and lift forces applied on the sawtooth-shaped intruder moving in the granular media, the DEM simulation is conducted to analyze the effect of inclined angle, immersion depth, velocity and boundary condition on drag and lift forces. The results show that the drag and lift forces are increasing with inclined angle. And the drag force is growing with the immersion depth and moving velocity. At last, the predicted model for drag forces are built. The generalized results show that, the other parameters can be confirmed based on the known inclined angle. And the formula can describe the drag force of different velocities and immersion depths.