NDLI: Shear strength of shale weathered expansive soils along swell-shrink paths: analysis based on microscopic properties

Content Provider	Springer Nature Link
Author	Lin, Botao Cerato, Amy B.
Copyright Year	2015
Abstract	This study attempts to interpret the macro-scale mechanical behavior of two natural expansive soils based on their microscopic properties. To accomplish this, an extensive investigation on the microscopic properties, including physicochemical properties, especially point of zero charge and microstructural characteristics observed from environmental scanning electron microscopy, was carried out in order to understand the sample fabric and the interparticle forces affecting it. Furthermore, triaxial tests were conducted on the saturated and unsaturated specimens to evaluate their strength behavior with respect to the governing microscopic forces and microstructure. The effects of mean stress, suction, capillary history and strain level on the shear strength were thoroughly examined. It was found that the initial sample structure has a profound impact on the development of effective stress paths of the saturated specimens. For the sample with a flocculated structure, capillary history causes substantial structural evolutions along different capillary paths, and consequently results in significant changes in the peak shear strength. For the laminar sample, the impact of capillary history is negligible on its peak strength. On the other hand, the large-strain shear strength is insensitive to capillary history, regardless of soil type because the specimens are fully destructed with respect to their fabric, experiencing a loss of electrical attraction and equilibrium of diffuse double layer repulsion.
Starting Page	6887
Ending Page	6899
Page Count	13
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	9
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-07-07
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Shale Expansive soils PZC Microstructure Wetting/drying Swell/shrink Shear strength Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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