Microstructural investigation on mechanical behavior of soil-geosynthetic interface in direct shear test

Punetha, P; Mohanty, P; Samanta, M

Microstructural investigation on mechanical behavior of soil-geosynthetic interface in direct shear test

Punetha, P

Mohanty, P Samanta, M

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Publisher:: ELSEVIER SCI LTD
Publication Type:: Journal Article
Citation:: Geotextiles and Geomembranes, 2017, 45, (3), pp. 197-210
Issue Date:: 2017-06-01

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Field	Value	Language
dc.contributor.author	Punetha, P https://orcid.org/0000-0002-0812-4708
dc.contributor.author	Mohanty, P
dc.contributor.author	Samanta, M
dc.date.accessioned	2022-10-27T04:54:01Z
dc.date.available	2022-10-27T04:54:01Z
dc.date.issued	2017-06-01
dc.identifier.citation	Geotextiles and Geomembranes, 2017, 45, (3), pp. 197-210
dc.identifier.issn	0266-1144
dc.identifier.issn	1879-3584
dc.identifier.uri	http://hdl.handle.net/10453/162759
dc.description.abstract	Interface shear strength between soil and geosynthetics mainly depends on the mechanical and physical properties of soil, geosynthetics and the normal stress acting at the interface. This paper presents results of an extensive experimental investigation carried out on sand-geosynthetic interface using modified large direct shear box. The study focusses on the shearing mechanism at the sand-geosynthetic interface and the effect of different parameters on the shearing mechanism. Smooth HDPE geomembrane, nonwoven needle punched geotextile and two types of sand having different mean particle size, have been used in the present study. Microstructural investigation of deformed specimen through Field Emission Scanning Electron Microscope (FESEM) reveals the shearing mechanism which includes interlocking and fiber stretching for sand-geotextile while sliding, indentation and plowing for sand-geomembrane interface. The shearing mechanism for sand-geomembrane interface highly depends on the normal stress and degree of saturation of sand. The critical normal stress that demarcates the sliding and plowing mechanism for sand-geomembrane interface is different for dry and wet sand. The amount of scouring (or plowing) of the geomembrane surface reduces with increase in the mean particle size of sand. FESEM images revealed that the sand particles get adhered to the geotextile fibers for tests involving wet sands. The present microstructural study aided in understanding the shearing mechanism at sand-geosynthetic interface to a large extent.
dc.language	English
dc.publisher	ELSEVIER SCI LTD
dc.relation.ispartof	Geotextiles and Geomembranes
dc.relation.isbasedon	10.1016/j.geotexmem.2017.02.001
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject	0905 Civil Engineering, 0915 Interdisciplinary Engineering
dc.subject.classification	Geological & Geomatics Engineering
dc.title	Microstructural investigation on mechanical behavior of soil-geosynthetic interface in direct shear test
dc.type	Journal Article
utslib.citation.volume	45
utslib.for	0905 Civil Engineering
utslib.for	0915 Interdisciplinary Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2022-10-27T04:53:59Z
pubs.issue	3
pubs.publication-status	Published
pubs.volume	45
utslib.citation.issue	3

Abstract:

Interface shear strength between soil and geosynthetics mainly depends on the mechanical and physical properties of soil, geosynthetics and the normal stress acting at the interface. This paper presents results of an extensive experimental investigation carried out on sand-geosynthetic interface using modified large direct shear box. The study focusses on the shearing mechanism at the sand-geosynthetic interface and the effect of different parameters on the shearing mechanism. Smooth HDPE geomembrane, nonwoven needle punched geotextile and two types of sand having different mean particle size, have been used in the present study. Microstructural investigation of deformed specimen through Field Emission Scanning Electron Microscope (FESEM) reveals the shearing mechanism which includes interlocking and fiber stretching for sand-geotextile while sliding, indentation and plowing for sand-geomembrane interface. The shearing mechanism for sand-geomembrane interface highly depends on the normal stress and degree of saturation of sand. The critical normal stress that demarcates the sliding and plowing mechanism for sand-geomembrane interface is different for dry and wet sand. The amount of scouring (or plowing) of the geomembrane surface reduces with increase in the mean particle size of sand. FESEM images revealed that the sand particles get adhered to the geotextile fibers for tests involving wet sands. The present microstructural study aided in understanding the shearing mechanism at sand-geosynthetic interface to a large extent.

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http://hdl.handle.net/10453/162759