含盐量对硫酸钠盐渍土–混凝土界面剪切特性的影响研究

doi:10.13722/j.cnki.jrme.2021.0975

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Abstract In order to explore the strength and deformation differences of the interface between saline soil and concrete in different areas，using self-made sodium sulphate saline soil and concrete samples，a series of monotonic direct shear tests were carried out under different salt contents，initial dry densities and normal stresses. The effects of different factors on the interfacial shear strength were studied，and the variation laws of the interfacial shear strength parameters and dilatancy under different salt contents were analyzed. The results show that the deterioration of the interfacial shear strength is caused by the salt content. If the pore solution of saline soil is in unsaturated state，the deterioration is weakened with the increase of the salt content. Otherwise，the degradation effect is increased. The enhancement effect of the initial dry density on the interfacial shear strength is inhibited by saline soil. The average failure shear stresses of the interface with salt contents of 1% to 4% under different vertical stresses are respectively 0.71，0.75，0.86 and 0.77 times that of plain soil，and the salt erosion reduction coefficient of the interface varies in the range of 0.68–0.88. As the salt content increases，the interfacial cohesion is enhanced，and the same trend as the shear strength is shown in the internal friction angle. In addition，the interface cohesion is more significantly affected by the salt content. Under the condition of a lower normal stress and a higher salt content，dilatancy is appeared in the interface，and shear shrinkage is shown in other cases. The shear shrinkage increases with the normal stress，and the minimum value is obtained when the salt content is 3%. The interfacial dilatancy angle increases significantly with the increase of the salt content in the range of 0% to 3% of the salt content. Besides，the increase of the interfacial dilatancy angle is restrained by a higher normal stress and the effect of the salt content on the dilatancy angle is weakened under the same condition.

Key words： soil mechanics saline soil salt content interface between soil and concrete shear characteristic salt erosion reduction coefficient

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	Articles by authors
	LIU Feiyu1
	ZHAO Chuan1
	SUN Honglei2
	ZHANG Shixun1

Cite this article:

LIU Feiyu1,ZHAO Chuan1,SUN Honglei2, et al. Study on the effect of salt content on the shear characteristics of the interface between sodium sulphate saline soil and concrete[J]. , 2022, 41(8): 1680-1688.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0975 OR http://rockmech.whrsm.ac.cn/EN/Y2022/V41/I8/1680

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