不同冻融模式下淤泥质土力学及微观结构特性研究

doi:10.13722/j.cnki.jrme.2022.0646

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Abstract Through a self-improved temperature controlled triaxial apparatus，the consolidated undrained shear test after freeze-thaw(FC mode) and unconsolidated undrained shear test after freeze-thaw(CF mode) were carried out on the remolded muddy soil，considering the combined effects of freeze-thaw confining pressure，times and freezing temperature. The effects of the above factors on the mechanical properties of the remolded soil were analyzed. The influence mechanism of freeze-thaw confining pressure on the mechanical properties was revealed by SEM. The results show that the confining pressure during freeze-thaw cycles reduces the number of pores in the soil after freezing and thawing，thus reducing the weakening effect of freezing and thawing on the strength and modulus in FC mode. While in CF mode，the freezing and thawing confining pressure increases the pores in the soil after freezing and thawing，and the excess pore pressure in the soil increases without dissipation during the soil thawing，which further aggravates the weakening effect of freezing and thawing on the strength and modulus of the soil. In two modes，the lower the freezing temperature and the greater the number of freeze-thaw cycles，the more obvious the strength weakening effect of the muddy soil, and the higher the excess pore water pressure when the soil is yield. The variation rules of mechanical index deterioration coefficient of the muddy soil with freeze-thaw confining pressure，times and freezing temperature can be described by a growth function.

Key words： soil mechanics;freeze-thaw confining pressure;freezing temperature;number of freeze-thaw cycles mechanical index;deterioration coefficient

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	Articles by authors
	ZHANG Jianxin1
	2
	MA Changhu2
	LANG Ruiqing1
	2
	SUN Liqiang3
	YAN Shuwang3

Cite this article:

ZHANG Jianxin1,2,MA Changhu2, et al. Experimental study on mechanical properties and microstructure of muddy soil under different freeze-thaw modes[J]. , 2023, 42(S1): 3801-3811.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2022.0646 OR https://rockmech.whrsm.ac.cn/EN/Y2023/V42/IS1/3801

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