Soil–water retention curves and microstructures of undisturbed and compacted Guilin lateritic clay

Sun, D; You, G; Annan, Z; Daichao, S

Soil–water retention curves and microstructures of undisturbed and compacted Guilin lateritic clay

Sun, D You, G Annan, Z Daichao, S

Permalink

Publisher:: SPRINGER HEIDELBERG
Publication Type:: Journal Article
Citation:: Bulletin of Engineering Geology and the Environment, 2016, 75, (2), pp. 781-791
Issue Date:: 2016-05-01

Closed Access

	Filename	Description	Size
	Sun2016_Article_SoilWaterRetentionCurvesAndMic.pdf	Published version	1.02 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	Sun, D
dc.contributor.author	You, G
dc.contributor.author	Annan, Z
dc.contributor.author	Daichao, S
dc.date.accessioned	2022-08-12T22:51:32Z
dc.date.available	2022-08-12T22:51:32Z
dc.date.issued	2016-05-01
dc.identifier.citation	Bulletin of Engineering Geology and the Environment, 2016, 75, (2), pp. 781-791
dc.identifier.issn	1435-9529
dc.identifier.issn	1435-9537
dc.identifier.uri	http://hdl.handle.net/10453/160055
dc.description.abstract	To investigate the soil–water retention curves of undisturbed and compacted lateritic clay specimens in the full suction range, suction is imposed or measured by using the pressure plate method, filter paper and vapor equilibrium technique with a saturated salt solution. The mercury intrusion porosimetry (MIP) tests were also performed to observe the pore size distribution (PSD) of undisturbed and compacted samples. The test results show that the undisturbed samples have lower gravimetric water content and degree of saturation than the compacted samples at the same density in the suction ranging from 0 kPa to 10 MPa. According to the study on microstructures, the observed phenomenon can be explained by internal cracks of undisturbed samples continuing to develop along with an increase in suction. When the suction is higher than 10 MPa, the soil–water retention curves (SWRCs) coincide with each other for both undisturbed and compacted samples. Undisturbed samples exhibit a unimodal PSD, while unsaturated, compacted samples have a distinct bimodal PSD. The structural degradation of the clay aggregate due to the moisture change leads to the change of the inter-aggregate pores (the intra-aggregate pores remain almost unchanged). For unsaturated, compacted samples with different void ratios, the intra-aggregate PSDs are almost the same, while the inter-aggregate PSD varies with the void ratio. This can be adopted to explain that the wetting branches of the SWRCs are independent of the dry density in the high suction range when the SWRC is expressed by the relation between suction and gravimetric water content. The results of MIP tests on a saturated sample are used to predict the SWRC of the same soil in the main drying.
dc.language	English
dc.publisher	SPRINGER HEIDELBERG
dc.relation.ispartof	Bulletin of Engineering Geology and the Environment
dc.relation.isbasedon	10.1007/s10064-015-0765-2
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0403 Geology, 0905 Civil Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Soil–water retention curves and microstructures of undisturbed and compacted Guilin lateritic clay
dc.type	Journal Article
utslib.citation.volume	75
utslib.for	0403 Geology
utslib.for	0905 Civil Engineering
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
utslib.copyright.status	closed_access	*
dc.date.updated	2022-08-12T22:51:31Z
pubs.issue	2
pubs.publication-status	Published
pubs.volume	75
utslib.citation.issue	2

Abstract:

To investigate the soil–water retention curves of undisturbed and compacted lateritic clay specimens in the full suction range, suction is imposed or measured by using the pressure plate method, filter paper and vapor equilibrium technique with a saturated salt solution. The mercury intrusion porosimetry (MIP) tests were also performed to observe the pore size distribution (PSD) of undisturbed and compacted samples. The test results show that the undisturbed samples have lower gravimetric water content and degree of saturation than the compacted samples at the same density in the suction ranging from 0 kPa to 10 MPa. According to the study on microstructures, the observed phenomenon can be explained by internal cracks of undisturbed samples continuing to develop along with an increase in suction. When the suction is higher than 10 MPa, the soil–water retention curves (SWRCs) coincide with each other for both undisturbed and compacted samples. Undisturbed samples exhibit a unimodal PSD, while unsaturated, compacted samples have a distinct bimodal PSD. The structural degradation of the clay aggregate due to the moisture change leads to the change of the inter-aggregate pores (the intra-aggregate pores remain almost unchanged). For unsaturated, compacted samples with different void ratios, the intra-aggregate PSDs are almost the same, while the inter-aggregate PSD varies with the void ratio. This can be adopted to explain that the wetting branches of the SWRCs are independent of the dry density in the high suction range when the SWRC is expressed by the relation between suction and gravimetric water content. The results of MIP tests on a saturated sample are used to predict the SWRC of the same soil in the main drying.

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

http://hdl.handle.net/10453/160055