With the increasing number of projects in cold regions and the widespread use of artificial freezing methods, conducting research on the dynamic properties of frozen soil has become a considerable issue that cannot be avoided in permafrost engineering. Currently, the numerical simulation research on the dynamic mechanical behavior of frozen soil is less concerned with the changes in stress, strain, and particle damage inside the material. The necessary conditions for conducting this study are compatible with the core idea of smooth particle hydrodynamics (SPH). In this study, the Eulerian SPH method was modified to address numerical oscillations and errors in solid mechanics, particularly impact dynamics problems. A numerical scheme for simulating the split Hopkinson pressure bar test was developed within the modified Eulerian SPH framework and implemented using self-programming. The frozen soil dynamic mechanical behavior was simulated under three strain rates. The accuracy and superiority of the SPH method were verified through calculations and experiments. The simulation captures the stress and strain responses within the sample at different moments during the impact process, indicating that the frozen soil strain rate-strengthening effect resulted from microcrack expansion and inertial effects.

随着寒冷地区工程的不断增多和人工冻结方法的广泛应用，冻土动力特性研究已成为多年冻土工程中不可回避的重要问题。目前，冻土动态力学行为的数值模拟研究较少关注材料内部应力、应变和颗粒损伤的变化。进行这项研究的必要条件与光滑粒子流体动力学（SPH）的核心思想兼容。在本研究中，对欧拉 SPH 方法进行了修改，以解决固体力学中的数值振荡和误差，特别是冲击动力学问题。在改进的欧拉 SPH 框架内开发了用于模拟分裂霍普金森压力杆测试的数值方案，并使用自编程实现。模拟了三种应变率下冻土的动态力学行为。通过计算和实验验证了SPH方法的准确性和优越性。模拟捕捉了冲击过程中不同时刻样品内的应力和应变响应，表明冻土应变率强化效应是由微裂纹扩展和惯性效应引起的。