冻融循环对青藏粉质黏土动力非线性参数影响的试验研究

doi:10.13722/j.cnki.jrme.2019.1100

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Abstract Based on the freeze-thaw cycles tests，the dynamic triaxial tests are carried out to study the dynamic nonlinear parameters of Qinghai－Tibet silty clay. In the test，the effects of freeze-thaw cycles，dynamic loading frequency and moisture content are considered. Then，the backbone curve of dynamic shear stress vs. dynamic shear strain(τd-γd) and the relationship curve of dynamic shear modulus ratio vs. dynamic shear strain(Gd/Gdmax-γd) are obtained. The results indicate that the dynamic behavior of the remolded Qinghai－Tibet silty clay can be described by Hardin-Drnevich hyperbolic model. Freeze-thaw cycles，frequency and moisture content all have significant influence on the dynamic nonlinear parameters of Qinghai－Tibet silty clay，which tend to be stable after 6 freeze-thaw cycles. With the phase transition of pore water during freeze-thaw cycles，the soil structure was deteriorated. It is the inherent mechanism for the drastic changes of dynamic behaviors of Qinghai－Tibet silty clay. When γd is constant(e.g.，γd = 0.001)，τd decreases rapidly first，then increases slightly，and Gd/Gdmax does not change much as the number of freeze-thaw cycles increases，for the sample with moisture content of 18% that has subjected of 1，3，6 and 10 freeze-thaw cycles，τd decreases by 35.4%，48.6%，41.6% and 43.0%，Gd/Gdmax decreases by 6.1%，0.5%，–1.2% and 0.4% respectively. With increasing frequency，τd increases and Gd/Gdmax decreases continuously，as frequency increases from 0.5 Hz to 5 Hz，for the sample with moisture content of 18% that has subjected of 0，1，3 and 6 freeze-thaw cycles，τd increases by 14.4%，22.1%，68.8% and 52.6%，Gd/Gdmax decreases by 4.9%，17.2%，32.8% and 22.6% respectively. Both of τd and Gd/Gdmax decrease continuously as the moisture content increases，as moisture content increases from 13% to 19.5%，for the sample that has subjected of 0，1，3，6 and 10 freeze-thaw cycles，τd decreases by 53.7%，70.6%，77.8%，78.6% and 78.5%，Gd/Gdmax decreases by 18.5%，27.7%，28.8%，24.6% and 30.0% respectively. The research results can provide the dynamic parameters of thawed soil for the seismic response analysis in cold region sites.

Key words： soil mechanics silty clay freeze- thaw cycles dynamic triaxial test dynamic shear modulus ratio moisture content frequency

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	Articles by authors
	SU Yongqi1
	2
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	MA Wei1
	ZHONG Xiumei4
	WANG Qian4
	MU Yanhu1
	GAO Zhongnan4

Cite this article:

SU Yongqi1,2,3, et al. Experimental study of influence of freeze-thaw cycles on dynamic nonlinear parameters of Qinghai－Tibet silty clay[J]. , 2020, 39(S1): 2973-2985.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.1100 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/IS1/2973

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