Evolution of compaction bands in high porosity soft rock

Castellanza, R; Nova, R; Gerolymatou, E; Fusi, N; Barberini, V; Crosta, G

dc.contributor.author	Castellanza, R	en
dc.contributor.author	Nova, R	en
dc.contributor.author	Gerolymatou, E	en
dc.contributor.author	Fusi, N	en
dc.contributor.author	Barberini, V	en
dc.contributor.author	Crosta, G	en
dc.date.accessioned	2014-03-01T02:52:40Z
dc.date.available	2014-03-01T02:52:40Z
dc.date.issued	2010	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/35986
dc.relation.uri	http://www.scopus.com/inward/record.url?eid=2-s2.0-84859889189&partnerID=40&md5=f40943e45bd1f11a5a57d048193317ec	en
dc.subject.other	Axial strain	en
dc.subject.other	Compaction bands	en
dc.subject.other	Elastoplastic constitutive model	en
dc.subject.other	Experimental studies	en
dc.subject.other	High porosity	en
dc.subject.other	Loading direction	en
dc.subject.other	Mechanical response	en
dc.subject.other	Micro CT	en
dc.subject.other	Radial stress	en
dc.subject.other	Soft rocks	en
dc.subject.other	Strain stress curve	en
dc.subject.other	Stress paths	en
dc.subject.other	Volumetric strain	en
dc.subject.other	Compaction	en
dc.subject.other	Computerized tomography	en
dc.subject.other	Loading	en
dc.subject.other	Rock mechanics	en
dc.subject.other	Soil mechanics	en
dc.subject.other	Strain	en
dc.subject.other	Unloading	en
dc.subject.other	Rocks	en
dc.title	Evolution of compaction bands in high porosity soft rock	en
heal.type	conferenceItem	en
heal.publicationDate	2010	en
heal.abstract	High porosity soft rocks are characterized by a microstructure that collapse under loading exerting relevant volumetric strains in localized tabular zones perpendicular to the loading direction, called compaction bands. A detailed experimental study of the formation and the evolution of compaction bands will be presented. A strain-controlled oedometric apparatus able to detect radial stress has been used for testing artificial and natural soft rocks. Initially, the mechanical response is essentially elastic until bonds are progressively broken. The axial strain-stress curve exhibits an unloading branch and a sort of curl appears in the stress path. Then, the behaviour becomes similar to an unbonded soil. A series of Micro-CT X-rays scansions are performed at different levels of total axial strain. Two compaction bands are formed one at the bottom and one at the top, due to the friction between the soft rock and the loading cups. By increasing the strain, the thickness of the two bands increase towards the center of the specimen, so that the whole specimen is completely destructured. Finally the experimental behaviour is reproduced with an elastoplastic constitutive model and the occurrence of compaction bands is theoretically predicted. © 2010 Taylor & Francis Group, London.	en
heal.journalName	Rock Engineering in Difficult Ground Conditions - Soft Rocks and Karst - Proceedings of the Regional Symposium of the International Society for Rock Mechanics, EUROCK 2009	en
dc.identifier.spage	249	en
dc.identifier.epage	254	en