负温对土动剪切模量阻尼比的影响规律

doi:10.13722/j.cnki.jrme.2015.1176

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Abstract The initial shear modulus，modulus ratio and damping ratio of frozen soil at different negative temperatures were experimentally investigated with the low temperature resonant column apparatus(LTRCA). The test results showed that conventional resonant column testing applied to the low- temperature samples resulted in large errors. The test parameters such as the frozen duration and the confining medium were determined. The negative temperature was found to have significant impact on the initial modulus and shear modulus ratio which was sensitive between －4 ℃ to 0 ℃ and stayed stable when lower than －4 ℃. When the temperature decreased in the sensitive interval，the initial modulus increased rapidly obeying the Boltzmann function，while the reference strain decreased sharply obeying also the Boltzmann function. In the stable interval，they changed smoothly. Below a certain strain，the damping ratio at the normal temperature was lower than that at low temperature. When the strain exceeded a certain strain，the damping ratio of normal test was larger than that of low temperature test. The negative temperature had significant influence on the maximum damping ratio，which decreased exponentially with the temperature decreasing.

Key words： soil mechanics low temperature resonant column test confining medium freezing duration initial shear modulus shear modulus ratio damping ratio

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	Articles by authors
	YU Xiaobo1
	SUN Rui1
	YUAN Xiaoming1
	MENG Shangjiu1
	2
	WANG Miao1
	SUN Yiqiang2

Cite this article:

YU Xiaobo1,SUN Rui1,YUAN Xiaoming1, et al. Influence of negative temperature on dynamic shear modulus and damping ratio of soil[J]. , 2016, 35(7): 1452-1465.

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http://www.rockmech.org/EN/10.13722/j.cnki.jrme.2015.1176 OR http://www.rockmech.org/EN/Y2016/V35/I7/1452

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