冻融过程中未冻水含量对非饱和粉土抗剪强度的影响

doi:10.13722/j.cnki.jrme.2018.0743

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Abstract A series of direct shear tests on unsaturated silt with a water content of 18.3% during freezing and thawing were conducted，and the phase composition of pore water was measured by NMR during the shear process. Effects of the unfrozen water content and the ice content on mechanical properties of the tested silt were analyzed. The results indicate that the freezing process of unsaturated silt can be divided into super-cooling stage ＞－1.15 ℃，no phase change)，rapid freezing stage(－1.15 ℃–－2 ℃) where 76% of the pore water freezes，and stable freezing stage(＜－2 ℃) where the unfrozen water content only decreases by 7%. The cohesion changes significantly with the temperature during the process of freezing and thawing while the friction angle varies slightly. The change of the shear strength of silt occurs primarily within the stable freezing stage，where the cohesion increases by 123.5% and the friction angle decreases by 12%. For the rapid freezing stage，the cohesion only ascends by 38.5% and the friction angle has no obvious change. It can be concluded that，within the rapid freezing phase，the freezing of the pore water drives the matrix suction to increase，which results in increasing of the cohesion，while that，within the stable freezing phase，the increase of the cementation strength between ice and soil particles leads to a rise of the cohesion. When the ice content changes slightly，the shear strength of frozen silt is mainly controlled by the cementation strength between ice and soil particles which depends on the thickness of the unfrozen water film. The decrease of the friction angle within the stable freezing phase is mainly caused by the force acting on the particle skeleton generated by volumetric expansion of the pore water upon freezing.

Key words： soil mechanics freezing and thawing processes unfrozen water content unsaturated silt shear strength

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	Articles by authors
	YAN Changgen1
	WANG Ting1
	JIA Hailiang2
	XU Wei3
	ZI Fan2
	TAO Yue1
	WEI Wei1
	WANG Yachong1

Cite this article:

YAN Changgen1,WANG Ting1,JIA Hailiang2, et al. Influence of the unfrozen water content on the shear strength of unsaturated #br# silt during freezing and thawing[J]. , 2019, 38(6): 1252-1260.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2018.0743 OR https://rockmech.whrsm.ac.cn/EN/Y2019/V38/I6/1252

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