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Dynamic Elastic Modulus and Damping Ratio of Unsaturated Red Clay

机译：不饱和红粘土的动态弹性模量和阻尼比

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摘要

Dynamic modulus of elasticity and damping ratio are two important parameters of dynamic properties of soil. These two parameters were extensively studied in the laboratory. However, there has been little research on these two parameters of the unsaturated red clay which is located in the southwest of Hunan, China. With the rapid development of high-speed railway in China, it is urgent to identify the dynamic properties of the unsaturated red clay to provide reference for the civil engineering industry. In this paper, DDS-70, an electromagnetic type dynamic tri-axial testing system, was used to study the effects of water content, dry density, confining pressure, over-consolidation ratio and loading frequency on dynamic elastic modulus and damping ratio of unsaturated red clay. The result shows that within the phase of small strain the influences of water content, dry density, confining pressure, over-consolidation ratio and loading frequency on dynamic modulus of elasticity are obvious. Dynamic modulus of elasticity increases with the increase of dry density, confining pressure and over-consolidation ratio under the same strain, whereas dynamic modulus of elasticity decreases with the increase of water content and loading frequency. Moreover, the effects of these factors on damping ratio are also significant during the phase of small strain. With the increase of strain, damping ratio increases with the decrease of dry density, confining pressure and over-consolidation ratio under the same dynamic strain. There is no clear relationship between damping ratio and loading frequency. It is concluded that the influence of above factors on the dynamic modulus of elasticity and damping ratio is significant.
机译：动态弹性模量和阻尼比是土壤动态性质的两个重要参数。在实验室中广泛研究了这两个参数。然而，在中国湖南西南部的不饱和红泥的这两个参数几乎没有研究。随着中国高速铁路的快速发展，迫切需要确定不饱和红粘土的动态特性，为土木工程产业提供参考。本文，DDS-70，电磁型动态三轴检测系统，用于研究水含量，干密度，限制压力，过度整合比和装载频率对不饱和的阻尼比的影响。红色粘土。结果表明，在小菌株的阶段内水含量，干密度，限制压力，过度整合比和装载频率对动态弹性模量的影响是显而易见的。动态弹性模量随着相同菌株的干密度，狭窄压力和过度整齐比率的增加而增加，而动态弹性模量随着水含量的增加和装载频率而降低。此外，在小菌株的阶段，这些因素对阻尼比的影响也是显着的。随着应变的增加，阻尼比随着干密度，狭窄压力和相同动态菌株下的过巩固比率的降低而增加。阻尼比和装载频率之间没有明显的关系。得出结论，上述因素对动态弹性模量和阻尼比的影响是显着的。

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