饱和黄土动剪切模量和阻尼比的试验研究

doi:10.13722/j.cnki.jrme.2019.0249

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Abstract In order to investigate the dynamic behaviors and influence factors of saturated loess，a series of dynamic triaxial tests were conducted to analyze the dynamic shear modulus and damping ratio of the loess sampled from 11 different sites in Loess Plateau，and the dynamic shear modulus ratio and the damping ratio were obtained by fitting the test results. The regional differences of the dynamic shear modulus ratio and damping ratio of saturated loess were discussed，and the differences of the dynamic shear modulus ratio and the damping ratio between the saturated loess and the original loess were also analyzed. In addition，influence of physical indexes on fitting parameters of the dynamic modulus and the damping ratio of the saturated loess was analyzed. The results indicate that the dynamic constitutive relation of the saturated loess obeys the Hardin-Drnevich model. The regional distributive characteristics of the loess have a significant influence on the damping ratio while slight on the dynamic shear modulus ratio. Both the value and the regional discreteness of the dynamic shear modulus ratio of the saturated loess are much smaller than those of the original loess. In the same site，however，the damping ratio of the saturated loess is markedly larger than that of the original loess，which is influenced by the loess structure. The maximum dynamic shear modulus of the saturated loess is greatly influenced by the initial void ratio，and the changes of the ultimate dynamic shear stress amplitude and the maximum damping ratio are mainly caused by the variation of structural characteristics of the loess resulted from the increase of the clay content.

Key words： soil mechanics maximum dynamic shear modulus dynamic shear modulus ratio damping ratio dynamic triaxial test regional difference

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	Articles by authors
	WANG Qian1
	2
	MA Jinlian1
	2
	MA Haiping2
	WANG Jun1
	2
	WANG Lanmin1
	2
	GAO Zhongnan2
	ZHONG Xiumei1
	2

Cite this article:

WANG Qian1,2,MA Jinlian1, et al. Dynamic shear modulus and damping ratio of saturated loess[J]. , 2019, 38(9): 1919-1927.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0249 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I9/1919

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