Influence of drying-wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) relaxometry

doi:10.1139/cgj-2016-0614

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	Influence of drying-wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) relaxometry
	Kong, Lingwei 2; Sayem, Hossain Md.1,2; Tian, Huihui 2
刊名	CANADIAN GEOTECHNICAL JOURNAL
	2018
卷号	55 期号:2 页码:208-216
关键词	granite residual soil drying-wetting cycles soil-water characteristic curve (SWCC) nuclear magnetic resonance (NMR) pore-size distribution (POSD)
ISSN号	0008-3674
DOI	10.1139/cgj-2016-0614
英文摘要	Due to the formational environment and climatic variability, granite residual soils with grain-size distribution ranging from gravel to clay undergo multiple drying-wetting cycles. The influences of multiple drying-wetting cycles on the soil-water characteristic curve (SWCC) and pore-size distribution (POSD) of undisturbed granite residual soils are investigated using the pressure plate test and nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) distribution measurement, respectively. Results show that the water-retention capacity and air-entry value decrease and pores become more uniform with increasing drying-wetting cycles. After four drying-wetting cycles, the soil reaches a nearly constant state. The POSD change of multiple drying-wetting cycle samples is consistent with the SWCC of the soils. Furthermore, a modified van Genuchten model in terms of cumulative pore volume is used to obtain the best-fit POSD of the drying-wetting cycle samples. The shape and changing tendency of both curves of SWCC and POSD are quite similar and achieved a better correlation. It can be concluded that the SWCC is strongly dependent on the POSD of the soil and NMR T-2 relaxometry can be used as an alternative to the assessment of microstructural variation of residual soils subjected to the periodic drying and wetting process.
WOS研究方向	Engineering ; Geology
语种	英语
出版者	CANADIAN SCIENCE PUBLISHING, NRC RESEARCH PRESS
WOS记录号	WOS:000423748300005
内容类型	期刊论文
源URL	[http://119.78.100.198/handle/2S6PX9GI/4208]
专题	岩土力学所知识全产出_期刊论文国家重点实验室知识产出_期刊论文
作者单位	1.Jahangirnagar Univ, Dept Geol Sci 2.Chinese Acad Sci, State Key Lab Geomech & Geotech Engn, Inst Rock & Soil Mech ;
推荐引用方式 GB/T 7714	Kong, Lingwei,Sayem, Hossain Md.,Tian, Huihui. Influence of drying-wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) relaxometry[J]. CANADIAN GEOTECHNICAL JOURNAL,2018,55(2):208-216.
APA	Kong, Lingwei,Sayem, Hossain Md.,&Tian, Huihui.(2018).Influence of drying-wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) relaxometry.CANADIAN GEOTECHNICAL JOURNAL,55(2),208-216.
MLA	Kong, Lingwei,et al."Influence of drying-wetting cycles on soil-water characteristic curve of undisturbed granite residual soils and microstructure mechanism by nuclear magnetic resonance (NMR) spin-spin relaxation time (T-2) relaxometry".CANADIAN GEOTECHNICAL JOURNAL 55.2(2018):208-216.