Πειραματική διερεύνηση φαινομένου διάχυσης  κοκκώδους
εδάφους σε διφασικό ρευστό με διαφορετικές αναλογίες
αέριας και υγρής φάσης

Ταμβάκου, Λυγερή; Tambakou, Lyreri

dc.contributor.author	Ταμβάκου, Λυγερή	el
dc.contributor.author	Tambakou, Lyreri	en
dc.date.accessioned	2015-07-09T07:24:47Z
dc.date.available	2015-07-09T07:24:47Z
dc.date.issued	2015-07-09
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/40938
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.4130
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Ναυτική και Θαλάσσια Τεχνολογία και Επιστήμη”	el
dc.rights	Default License
dc.subject	Διφασικό ρευστό	el
dc.subject	Διάχυση
dc.subject	Μέθοδος PIV
dc.subject	Μέθοδος DIC
dc.title	Πειραματική διερεύνηση φαινομένου διάχυσης κοκκώδους εδάφους σε διφασικό ρευστό με διαφορετικές αναλογίες αέριας και υγρής φάσης	el
heal.type	masterThesis
heal.classification	Εδαφομηχανική	el
heal.language	el
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2015-04-08
heal.abstract	I discuss theories of granular material ﬂows, with application to granular ﬂows on the earth and planets. There are two goals. First, there is a lingering belief of some that the standard continuum plasticity Mohr–Coulomb and/or Drucker–Prager models are not adequate for many large-scale granular ﬂow problems. The stated reason for those beliefs is the fact that the ﬁnal slopes of the run-outs in collapse, landslide problems, and large-scale cratering are well below the angle of repose of the material. That observation, combined with the supposition that in those models ﬂow cannot occur with slopes less than the angle of repose, has led to a number of researchers suggesting a need for lubrication or ﬂuidization mechanisms and modeling. That issue is investigated in detail and shown to be false. A complete analysis of slope failures according to the Mohr–Coulomb model is presented, with special attention to the relations between the angle of repose and slope failures. It is shown that slope failure can occur for slope angles both larger than and smaller than the angle of repose. Second, to study the details of landslide run-outs, ﬁnite-difference continuum code simulations of the prototypical cliff collapse problem, using the classical plasticity models, are presented, analyzed and compared to experiments. Although devoid of any additional ﬂuidization models, those simulations match experiments in the literature extremely well. The dynamics of this problem introduces additional important features relating to the run-out and ﬁnal slope angles. The vertical free surface begins to fall at the initial 901 and ﬂow continues to a ﬁnal slope less than 101. The detail in the calculation is examined to show why ﬂow persists at slope angles that appear to be less than the angle of repose. The motions include regions of solid-like, ﬂuid-like, and gas-like ﬂows without invoking any additional models.	en
heal.advisorName	Σακελλαρίου, Μιχαήλ	el
heal.committeeMemberName	Μαυράκος, Σπυρίδων	el
heal.committeeMemberName	Χατζηγεωργίου, Ιωάννης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Ναυπηγών Μηχανολόγων Μηχανικών	el
heal.academicPublisherID	ntua
heal.numberOfPages	89 σ.	el
heal.fullTextAvailability	true