气候变化领域集成服务门户(CCPortal): Quantitative analysis for the effect of microstructure on the mechanical strength of frozen silty clay with different contents of sodium sulfate

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DOI	10.1007/s12665-017-6454-7
	Quantitative analysis for the effect of microstructure on the mechanical strength of frozen silty clay with different contents of sodium sulfate
	You, Zhemin; Lai, Yuanming; Zhang, Mingyi; Liu, Enlong
发表日期	2017
ISSN	1866-6280
EISSN	1866-6299
卷号	76 期号:4
英文摘要	Microstructural transformation is known substantially to be the reason for the differences in mechanical behavior and the failure mechanism of saline soil. The mechanical strength of frozen saline soil decreases by 19.0% initially and then increases by 49.3% with the increasing mass content of sodium sulfate, with the threshold value of 1.5%. To explain the mechanism of this phenomenon, mercury intrusion porosity and scanning electron microscope were adopted to obtain the pore size distributions and microstructural characteristics of silty clay with different mass contents of sodium sulfate at 0.0, 1.5, 2.5 and 5.0%, respectively. The microstructural parameters were calculated by the Image-Pro Plus software based on the threshold of 75 and magnification of 10009 and 20009. The porosity increases firstly and reduces with the rising salt content, and the fractal dimension is affected slightly ranging from 1.18 to 1.23. As the salt content increases from 0.0 to 1.5%, salts dissolve completely and the thickness of liquid film increases, so does the pore volume, and the friction of soil particles and the mechanical strength decreases. When the salt content is beyond the threshold value, the solution in soil is supersaturated, and salts crystallize and fill the pores and deduce the pore volume. The increasing interlocking abilities between crystals and particles enhance the mechanical strength of frozen saline soil. The results can provide a theoretical guidance to predict the frost and salt heave of frozen saline soil engineering.
英文关键词	Sodium sulfate; Frozen saline silty clay; Microstructural characteristics; Salt threshold value; Frost and salt heave
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Geology ; Water Resources
WOS类目	Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources
WOS关键词	SATURATED POROUS MATERIALS ; SALT CRYSTALLIZATION ; DAMAGE ; SOIL ; POROSIMETRY ; TRANSPORT ; MODEL
WOS记录号	WOS:000394965100005
来源期刊	ENVIRONMENTAL EARTH SCIENCES
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/239479
作者单位	[You, Zhemin; Lai, Yuanming; Zhang, Mingyi; Liu, Enlong] Chinese Acad Sci, Cold & Arid Regions Environm & Engn Res Inst, State Key Lab Frozen Soil Engn, Lanzhou 730000, Peoples R China; [Liu, Enlong] Sichuan Univ, Coll Water Resource & Hydropower, Chengdu 610065, Peoples R China
推荐引用方式 GB/T 7714	You, Zhemin,Lai, Yuanming,Zhang, Mingyi,et al. Quantitative analysis for the effect of microstructure on the mechanical strength of frozen silty clay with different contents of sodium sulfate[J],2017,76(4).
APA	You, Zhemin,Lai, Yuanming,Zhang, Mingyi,&Liu, Enlong.(2017).Quantitative analysis for the effect of microstructure on the mechanical strength of frozen silty clay with different contents of sodium sulfate.ENVIRONMENTAL EARTH SCIENCES,76(4).
MLA	You, Zhemin,et al."Quantitative analysis for the effect of microstructure on the mechanical strength of frozen silty clay with different contents of sodium sulfate".ENVIRONMENTAL EARTH SCIENCES 76.4(2017).