以抗剪性能与结构损伤评价纤维加筋土的冻融耐久性

doi:10.13722/j.cnki.jrme.2021.0737

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Abstract Under freeze-thaw cycling，the soil structure was failed，soil porosity was increased，and the pore distribution characteristics was varied，resulting in the degradation of the soil shear performance. A series of tests on lime-soil and fiber-lime-soil，including freeze-thaw test，the triaxial compression test，and NMR test，were completed to research the shear performances and microstructure variation of lime-soil and fiber-lime-soil under freeze-thaw cycling. The results showed that the cohesion and internal friction angle of lime-soil and fiber-lime-soil gradually decreased with the increase of freeze-thaw cycles. The freeze-thaw deterioration was divided into three stages，namely，large strength decline stage，small strength decline stage and strength stability stage. The stress-strain characteristics of lime-soil transformed from strain softening to strain hardening because of adding fibers，and the soil failure form changed from brittle failure to plastic failure. With the increase of freeze-thaw cycles，the porosity and the pore radius of soil increased，the micro pore volume decreased，and the small pore volume，medium pore volume and large pore volume increased. After 10 freeze-thaw cycling，the large pore volume varied little. Because of the spatial restraint effect of fiber on soil and the friction between fiber and soil，the increase of pore radius and porosity of soil were limited to a certain extent，which resulted in the improvement of the shear performance and freeze-thaw resistance of fiber-lime-soil.

Key words： soil mechanics freeze-thaw cycling fiber reinforced soil shear performance pore radius；porosity pore distribution

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	Articles by authors
	WEI Li1
	CHAI Shouxi1
	XUE Meiling1
	WANG Pei1
	LI Fang2

Cite this article:

WEI Li1,CHAI Shouxi1,XUE Meiling1, et al. Evaluation of freeze-thaw durability of fiber reinforced soil by shear performances and structural damage[J]. , 2022, 41(S2): 3453-3463.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0737 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS2/3453

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