The dynamic compressive deformation of frozen soil was investigated by conducting the split-Hopkinson pressure bar (SHPB) experiments at three temperatures and different high strain rates, and the dynamic stress–strain responses and failure modes of the frozen soil were analyzed. The experimental results demonstrate that the frozen soil exhibits evident dependence on the strain rate and temperature under the dynamic loading condition. The dynamic compressive stress–strain curve of the frozen soil was divided into three parts: the linear, nonlinear rising, and strain softening parts. The nonlinear rising and strain softening parts were both caused by the damage attributed to the debonding between the ice particles and soil matrix, from which a rate-dependent damage evolution equation was obtained. Moreover, a damage-coupled dynamic viscoelastic constitutive model of frozen soil at high strain rate was derived. A comparison between the theoretically predicted results and the experimental ones showed that the developed dynamic viscoelastic model could well describe the dynamic mechanical behavior of frozen soil at high strain rate.

通过在三种温度和不同高应变率下进行分裂霍普金森压力棒（SHPB）实验研究了冻土的动态压缩变形，并分析了冻土的动态应力应变响应和破坏模式。实验结果表明，冻土在动态加载条件下表现出明显的应变速率和温度依赖性。冻土的动态压应力-应变曲线分为三个部分：线性部分、非线性上升部分和应变软化部分。非线性上升部分和应变软化部分都是由冰粒与土基体脱粘引起的损伤引起的，从中得到了速率相关的损伤演化方程。而且，推导出了高应变速率下冻土的损伤耦合动态粘弹性本构模型。理论预测结果与实验结果的对比表明，所建立的动态粘弹性模型能够很好地描述高应变速率下冻土的动态力学行为。