NMR-Based Measurement of AWRC and Prediction of Shear Strength of Unsaturated Soils

Tao, G; Ouyang, Q; Lei, D; Chen, Q; Nimbalkar, S; Bai, L; Zhu, Z

NMR-Based Measurement of AWRC and Prediction of Shear Strength of Unsaturated Soils

Tao, G Ouyang, Q Lei, D Chen, Q Nimbalkar, S

Bai, L Zhu, Z

Permalink

Publisher:: ASCE-AMER SOC CIVIL ENGINEERS
Publication Type:: Journal Article
Citation:: International Journal of Geomechanics, 2022, 22, (9)
Issue Date:: 2022-09-01

Closed Access

	Filename	Description	Size
	(ASCE)GM.1943-5622.0002515.pdf		3.49 MB	Adobe PDF	View/Open

Copyright Clearance Process

Recently Added
In Progress
Closed Access

This item is closed access and not available.

Full metadata record

Field	Value	Language
dc.contributor.author	Tao, G
dc.contributor.author	Ouyang, Q
dc.contributor.author	Lei, D
dc.contributor.author	Chen, Q
dc.contributor.author	Nimbalkar, S https://orcid.org/0000-0002-1538-3396
dc.contributor.author	Bai, L
dc.contributor.author	Zhu, Z
dc.date.accessioned	2023-03-30T00:42:37Z
dc.date.available	2023-03-30T00:42:37Z
dc.date.issued	2022-09-01
dc.identifier.citation	International Journal of Geomechanics, 2022, 22, (9)
dc.identifier.issn	1532-3641
dc.identifier.issn	1943-5622
dc.identifier.uri	http://hdl.handle.net/10453/168818
dc.description.abstract	In recent years, accurate determination of the effective stress factor has been found to be instrumental for classifying the types of pore water and defining the form of their contribution to the unsaturated soil strength. In this study, a series of laboratory experiments based on volumetric flask, indoor evaporation and low-field nuclear magnetic resonance (NMR) methods were conducted on Wuhan clay to determine the relationship between adsorbed water content and matrix suction, and hence the adsorbed water retention curve (AWRC). The capillary water retention curve (CWRC) is the curve derived by subtracting the AWRC from the soil water characteristic curve (SWCC). This CWRC is then utilized to obtain correlation between the degree of saturation of capillary pores (Scap) and the matrix suction. The effective stress factor was replaced with Scap for determining the shear strength of Wuhan clay with three different dry densities. It was observed that the predicted values of shear strength obtained by NMR-based methods are more accurate than two other methods available in the literature. Furthermore, the accuracy of the method is not impacted by changes in dry density or confining pressure.
dc.language	English
dc.publisher	ASCE-AMER SOC CIVIL ENGINEERS
dc.relation.ispartof	International Journal of Geomechanics
dc.relation.isbasedon	10.1061/(ASCE)GM.1943-5622.0002515
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0914 Resources Engineering and Extractive Metallurgy
dc.subject.classification	General Mathematics
dc.title	NMR-Based Measurement of AWRC and Prediction of Shear Strength of Unsaturated Soils
dc.type	Journal Article
utslib.citation.volume	22
utslib.for	0905 Civil Engineering
utslib.for	0914 Resources Engineering and Extractive Metallurgy
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Strength - CBI - Centre for Built Infrastructure
utslib.copyright.status	closed_access	*
dc.date.updated	2023-03-30T00:42:35Z
pubs.issue	9
pubs.publication-status	Published
pubs.volume	22
utslib.citation.issue	9

Abstract:

In recent years, accurate determination of the effective stress factor has been found to be instrumental for classifying the types of pore water and defining the form of their contribution to the unsaturated soil strength. In this study, a series of laboratory experiments based on volumetric flask, indoor evaporation and low-field nuclear magnetic resonance (NMR) methods were conducted on Wuhan clay to determine the relationship between adsorbed water content and matrix suction, and hence the adsorbed water retention curve (AWRC). The capillary water retention curve (CWRC) is the curve derived by subtracting the AWRC from the soil water characteristic curve (SWCC). This CWRC is then utilized to obtain correlation between the degree of saturation of capillary pores (Scap) and the matrix suction. The effective stress factor was replaced with Scap for determining the shear strength of Wuhan clay with three different dry densities. It was observed that the predicted values of shear strength obtained by NMR-based methods are more accurate than two other methods available in the literature. Furthermore, the accuracy of the method is not impacted by changes in dry density or confining pressure.

Please use this identifier to cite or link to this item:

http://hdl.handle.net/10453/168818