The soil matrix, salt crystals, ice crystals, and pore solutions constitute the composite geological material of saturated saline frozen soil. The destruction mode and dynamic constitutive model of saturated saline frozen soil need to be studied because infrastructure construction is increasingly being extended to regions with saturated saline frozen soil. Based on the split Hopkinson pressure bar device, uniaxial impact compression tests were conducted on frozen soil samples with different salt contents under different strain rates. The strain rate of saturated saline frozen soil must be emphasized based on the results. The gradient of the elastic segment and maximum stress of the soil are negatively correlated with the salt content increase. To further explore the failure mechanism, the study examined the damage and failure behavior of saturated saline frozen soil, along with the absorption energy in the failure process. According to the test results, the saturated saline frozen soil was similar to a particle-reinforced composite. Subsequently, the debonding damage of the ice–salt eutectic and the mechanical–chemical damage of the soil matrix were considered. The test results could be predicted accurately from the results of the model, verifying that the influences of the salt content and strain rate are reasonably considered by the constructed model.

中文翻译：

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单轴冲击载荷下饱和盐渍冻土动力本构模型

土壤基质、盐晶、冰晶和孔隙溶液构成了饱和盐冻土的复合地质材料。随着基础设施建设日益向饱和盐渍冻土地区延伸，饱和盐渍冻土的破坏模式和动力本构模型亟待研究。基于分体式霍普金森压杆装置，对不同含盐量冻土样件在不同应变率下进行单轴冲击压缩试验。根据结果​​必须强调饱和盐渍冻土的应变率。弹性段梯度和土体最大应力与含盐量增加呈负相关。为了进一步探讨破坏机制，研究检查了饱和盐冻土的损伤和破坏行为，以及破坏过程中的吸收能量。根据试验结果，饱和盐渍冻土类似于颗粒增强复合材料。随后，考虑了冰盐共晶的脱粘损伤和土壤基质的机械化学损伤。模型结果能够准确预测试验结果，验证了所构建的模型合理地考虑了含盐量和应变速率的影响。