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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Dynamic characteristics of warm frozen soil under direct shear test-comparison with dynamic triaxial test
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Dynamic characteristics of warm frozen soil under direct shear test-comparison with dynamic triaxial test

机译：直接剪切试验与动态三轴试验下暖冻土的动力特性

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摘要

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.
机译：进行了一系列的动态直接剪切试验和三轴试验，以研究青藏铁路沿线暖冻土的动力特性。根据试验结果，给出了较高负温度下冻土的动剪应力与动剪应变之间的关系。讨论了冷却温度，垂直压力，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，Hardin-Drnevich本构模型可以描述不同冷却温度下暖冻土中的动应力-应变关系。最大动态剪切模量随冷却温度的降低以及垂直压力和围压的增加而增加。然而，随着振动时间的增加，它呈现出略微下降的趋势。另一方面，最大阻尼比随温度降低以及垂直压力和围压的增加而减小，但随着振动时间的增加而呈现出较小的增加趋势。多元回归方法用于评估动态参数和影响因素之间的关系。

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