NDLI: Hysteretic soil water characteristics and cyclic swell–shrink paths of compacted expansive soils

Content Provider	Springer Nature Link
Author	Lin, Botao Cerato, Amy B.
Copyright Year	2013
Abstract	The investigation of the hydromechanical behavior of unsaturated expansive soil depends on the determination of hysteretic soil water characteristic curves (HSWCCs). This research investigates the HSWCCs of two natural expansive soils initially compacted at optimum moisture content (OMC) and maximum dry density (MDD) and then saturated to their maximum expansion state to ensure identical capillary history. Filter paper, pressure plate and chilled mirror hygrometer suction measurement techniques were utilized, and corresponding measurements of three-dimensional volume change made. The cyclic swell–shrink paths were deduced in terms of volumetric strain versus either water content or suction. The cyclic three-dimensional volumetric measurements showed a much higher amount of swelling and shrinkage than those determined from one-dimensional measurements. Hydraulic hysteresis rapidly decreased with the swell–shrink cycles as a result of macro-structural stabilization. Under the no/low confining conditions, the swell–shrink cycles generally caused a decrease of global expansion and an increase of global shrinkage. Moreover, a special phenomenon showing a reduction of global shrinkage on significant drying was discovered in the less plastic soil sample.L’analyse du comportement hydromécanique des sols gonflants non saturés nécessite la détermination des courbes caractéristiques du comportement hydrique de ces sols. Cette étude examine ces courbes caractéristiques pour deux sols gonflants naturels, d’abord compactés à la teneur en eau optimale, avec une densité sèche maximale, ensuite saturés jusqu’à leur état de gonflement maximum afin d’obtenir un historique contrôlé de leur humidification. Les techniques du papier filtre, de la mise sous contrainte et des mesures de succion par hygromètre ont été utilisées et les mesures correspondantes des changements de volume réalisées. Les mesures cycliques tridimensionnelles de volume ont montré des amplitudes beaucoup plus grandes de gonflement et de retrait que celles déterminées à partir de mesures unidimensionnelles. L’hystérésis hydrique a diminué rapidement avec les cycles de gonflement-retrait en raison d’une stabilisation macrostructurale. Dans des conditions de confinement nul ou faible, les cycles de gonflement-retrait ont généralement entraîné une diminution du gonflement global et une augmentation du retrait global. Par ailleurs, un phénomène spécial montrant une réduction du retrait global pour des séchages importants a été découvert pour les échantillons de sols les moins plastiques.
Starting Page	61
Ending Page	70
Page Count	10
File Format	PDF
ISSN	14359529
Journal	Bulletin of the International Association of Engineering Geology - Bulletin de l'Association Internationale de Géologie de l'Ingénieur
Volume Number	72
Issue Number	1
e-ISSN	14359537
Language	English
Publisher	Springer-Verlag
Publisher Date	2013-01-05
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sol gonflant Courbes de comportement hydrique Hystérésis Changement de volume Gonflement-retrait cyclique Geotechnical Engineering & Applied Earth Sciences Geoengineering, Foundations, Hydraulics Geoecology/Natural Processes Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Geology Geotechnical Engineering and Engineering Geology

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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