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为了更好地描述冻土在冲击加载下的动态力学性能及其应力应变关系,将冻土看成是胡克弹簧和Maxwell体的并联组合体,并且引入符合双参数的Weibull分布损伤和Johnson-Cook模型的温度项对所研究的线性黏弹性模型进行了改进。利用分离式霍普金森杆(SHPB)对冻土进行了冲击加载实验,获得了冻土分别在不同温度、相同高应变率以及相同温度、不同高应变率冲击加载下的应力应变曲线,实验表明冻土具有明显的温度效应和应变率效应。对比实验曲线和理论曲线可以看出模型计算结果和实验结果具有很强的一致性,拟合良好,具有较高的工程应用价值。
In order to better describe the dynamic mechanical properties of frozen soil under impact loading and its stress-strain relationship, the frozen soil is considered as the parallel combination of Hook Spring and Maxwell body. The Weibull distribution damage and Johnson- The temperature term of Cook model improves the linear viscoelasticity model studied. The impact loading experiment of frozen soil was carried out by using split Hopkinson bar (SHPB), and the stress-strain curve of permafrost under different temperature, same high strain rate and impact loading under the same temperature and different high strain rates was obtained. Frozen soil has obvious temperature effect and strain rate effect. Comparing the experimental curve with the theoretical curve, it can be seen that the calculated results of the model are in good agreement with the experimental results, and are well fitted and have high engineering application value.