Abstract A series of dynamic direct shear tests and triaxial tests were conducted to investigate the dynamic properties of the warm frozen soil along the Qinghai-Tibet railway. The relationship between dynamic shear stress and dynamic shear strain of frozen soil under relatively high negative temperature is given according to the test results. The influences of cooling temperature, vertical pressure, confining pressure and vibration time on both dynamic shear modulus and dynamic damping ratio are discussed. The test results indicate that the dynamic stress-strain relationship in warm frozen soil at different cooling temperatures can be described by Hardin-Drnevich constitutive model. The maximum dynamic shear modulus increases with decreasing cooling temperature and increasing vertical and confining pressures; however, it exhibited a slightly decreasing tendency with increase in vibration time. On the other hand, the maximum damping ratio decreases with decreasing temperature and increasing vertical pressure and confining pressure, but showed a minor increasing tendency with increasing vibration time. The multiple regression method was used to assess the relationships between dynamic parameters and influence factors.

中文翻译：

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直剪试验下暖冻土的动力特性-与动力三轴试验的比较

摘要 为研究青藏铁路沿线暖冻土的动力特性，开展了一系列动力直剪试验和三轴试验。根据试验结果给出了较高负温下冻土动剪应力与动剪应变的关系。讨论了冷却温度、竖向压力、围压和振动时间对动剪切模量和动阻尼比的影响。试验结果表明，不同冷却温度下暖冻土的动态应力应变关系可以用Hardin-Drnevich本构模型来描述。最大动态剪切模量随着冷却温度的降低和垂直和围压的增加而增加；然而，随着振动时间的增加，它表现出略有下降的趋势。另一方面，最大阻尼比随着温度的降低和垂向压力和围压的增加而减小，但随着振动时间的增加呈现出较小的增加趋势。采用多元回归方法评估动态参数与影响因素之间的关系。