冻融循环对掺砾黏土体积变化和力学特性影响的试验研究

doi:10.13722/j.cnki.jrme.2021.0003

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Abstract In order to study the effects of freeze-thaw cycles on the volume changes and mechanical properties of clay-gravel mixtures，the freeze-thaw test was carried out on clay-gravel mixtures，and it was concluded that the sample volume will shrink when frozen，and the sample height shrinkage is less than the diameter shrinkage. When the number of freeze-thaw cycles exceeds 5 times，the sample volume tends to be stable. Besides，a series of unconsolidated and undrained triaxial tests were conducted with the different numbers of freeze-thaw cycles under various confining pressures，and the stress-strain behavior，failure strength，elastic modulus，cohesion and angle of internal friction were analyzed. The testing results show that the mechanical properties of clay-gravel mixtures are affected considerably，but the shape of the stress-strain curve doesn?t be influenced by the freeze-thaw cycles. After the first freeze-thaw cycle，the failure strength of the sample decreased sharply，and when the number of freeze-thaw cycles exceeds 2 times，the failure strength of the sample shows a trend of slowly decreasing first and then increasing slowly as the number of freeze-thaw cycles increases. The elastic modulus under various confining pressures decreases first and then increases with the increase of the number of freeze-thaw cycles，and the samples will get a minimum elastic modulus after 4–6 freeze-thaw cycles. The cohesion decreases first and then increases slowly as the number of freeze-thaw cycles increases，but the angle of internal friction is almost unaffected by freeze-thaw cycles. It is suggested that the strength parameter after 6 freeze-thaw cycles can be used as design parameters for engineering design of clay-gravel mixtures in seasonally frozen regions.

Key words： soil mechanics clay-gravel mixture freeze-thaw cycle triaxial compression test volume changes mechanical properties

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	Articles by authors
	ZHANG Yonggan1
	LU Yang1
	2
	LIU Sihong1
	ZHANG Chengbin1

Cite this article:

ZHANG Yonggan1,LU Yang1,2, et al. Effects of cyclic freezing and thawing on volume changes and mechanical properties of clay-gravel mixtures[J]. , 2021, 40(S2): 3323-3333.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0003 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3323

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