Deformation and failure mechanisms of granular soil around pressurised shallow cavities

Patino-Ramirez, Fernando; Ando, Edward; Viggiani, Gioacchino; Caicedo, Bernardo; Arson, Chloé

Title:

Deformation and failure mechanisms of granular soil around pressurised shallow cavities

dc.contributor.author	Patino-Ramirez, Fernando
dc.contributor.author	Ando, Edward
dc.contributor.author	Viggiani, Gioacchino
dc.contributor.author	Caicedo, Bernardo
dc.contributor.author	Arson, Chloé
dc.contributor.corporatename	Georgia Institute of Technology. School of Civil and Environmental Engineering	en_US
dc.contributor.corporatename	Universidad de los Andes, Bogota, Columbia. Civil and Environmental Engineering Department	en_US
dc.contributor.corporatename	Université Grenoble Alpes, France. CNRS	en_US
dc.date.accessioned	2021-11-30T14:46:25Z
dc.date.available	2021-11-30T14:46:25Z
dc.date.issued	2021
dc.description	Copyright © ICE Publishing 2021	en_US
dc.description.abstract	The deformation patterns and failure mechanisms of pressurised cavities at shallow depth are of relevance to many geotechnical applications, including tunneling and horizontal directional drilling. In this paper, we present an experimental study of a reduced-scale pressurised cavity under geostatic stress, in order to measure the effect of cavity length, vertical stress and soil density on soil deformation and failure. x-ray computed tomography is used to acquire images of the system at key stages of the cavity inflation process. A closed shaped failure region developed around the cavities, beyond which, shear planes of elliptic paraboloid shape formed, extending from the bottom of the cavities all the way to the free surface. The plane strain assumption did not hold beyond the central portion of the longest cavity tested (L = 6D). The volumetric strain and porosity changes inside the shear bands showed significant dilation in dense specimens, but contraction in loose specimens. The average orientation and the thickness of the shear bands were in agreement with those found in the literature for passive arching mechanisms (anchoring). The orientation of the principal strains around the cavity follows catenary shapes, similar to those displayed in active trapdoor mechanisms.	en_US
dc.identifier.citation	F. Patino-Ramirez, F. Anselmucci, E. Ando, G. Viggiani, B. Caicedo, C. Arson. 2021. Deformation and failure mechanisms of granular soil around pressurised shallow cavities, Geotechnique, DOI: 10.1680/jgeot.21.00136	en_US
dc.identifier.doi	https://doi.org/10.1680/jgeot.21.00136	en_US
dc.identifier.uri	http://hdl.handle.net/1853/65519
dc.subject	Cavity expansion	en_US
dc.subject	X-Ray tomography	en_US
dc.subject	Image analysis	en_US
dc.subject	Deformaion	en_US
dc.title	Deformation and failure mechanisms of granular soil around pressurised shallow cavities	en_US
dc.type	Text
dc.type.genre	Post-print
dspace.entity.type	Publication
local.contributor.author	Arson, Chloé
local.contributor.corporatename	School of Civil and Environmental Engineering
local.contributor.corporatename	College of Engineering
relation.isAuthorOfPublication	ce5325f0-830f-4636-bc90-7527fd99005b
relation.isOrgUnitOfPublication	88639fad-d3ae-4867-9e7a-7c9e6d2ecc7c
relation.isOrgUnitOfPublication	7c022d60-21d5-497c-b552-95e489a06569