Ανάλυση κυκλικού φρέατος αερισμού με δυδιάστατα και τρισδιάστατα μοντέλα πεπερασμένων στοιχείων (FEM)

Παπαδόπουλος, Δαμιανός; Papadopoulos, Damianos

dc.contributor.author	Παπαδόπουλος, Δαμιανός	el
dc.contributor.author	Papadopoulos, Damianos	en
dc.date.accessioned	2015-06-18T08:25:00Z
dc.date.available	2015-06-18T08:25:00Z
dc.date.issued	2015-06-18
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/40868
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.4078
dc.description	Εθνικό Μετσόβιο Πολυτεχνείο--Μεταπτυχιακή Εργασία. Διεπιστημονικό-Διατμηματικό Πρόγραμμα Μεταπτυχιακών Σπουδών (Δ.Π.Μ.Σ.) “Σχεδιασμός και Κατασκευή Υπόγειων Έργων”	el
dc.rights	Αναφορά Δημιουργού-Μη Εμπορική Χρήση 3.0 Ελλάδα	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc/3.0/gr/	*
dc.subject	Πεπερασμένα στοιχεία	el
dc.subject	Ανάλυση φρέατος	el
dc.subject	Εκσκαφή φρέατος αερισμού	el
dc.subject	Ventilation shatf	en
dc.subject	Εκσκαφή φρέατος αερισμού	en
dc.subject	PLAXIS 2D	en
dc.subject	PLAXIS 3D	en
dc.subject	FEM	en
dc.subject	PHASE2	el
dc.title	Ανάλυση κυκλικού φρέατος αερισμού με δυδιάστατα και τρισδιάστατα μοντέλα πεπερασμένων στοιχείων (FEM)	en
dc.title	Analysis of circular ventilation shaft with 2D and 3D finete element models (FEM)	el
heal.type	masterThesis
heal.classification	Geotechnical engineering	en
heal.classification	Γεωτεχνική μηχανική	el
heal.classification	Finite element method	en
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh2013000289
heal.classificationURI	http://id.loc.gov/authorities/subjects/sh85048349
heal.language	en
heal.access	free
heal.recordProvider	ntua	el
heal.publicationDate	2014-12-19
heal.abstract	In this research, finite element analyses are performed to simulate the process of a circular shaft excavation in a typical cross section consisting of Alluvial deposits. A 24 m deep air ventilation shaft is excavated and supported following a sequence of stages. Three finite element packages are used to simulate the excavation process: PLAXIS, PLAXIS 3D and Phase2. In the analysis two different shaft diameters are considered with an outer diameter of 10m and 16m respectively. The excavation support system consists of segmented circular pre-fabricated concrete rings. Internal ring segments are placed after each excavation stage to form the shaft final lining. Two construction models are analysed. In the first model during the first construction stage excavation of the first 1.5m of soil is performed. In the second construction stage further excavation of 1.5m of soil is performed and the lining is installed on the first 1.5m of excavation. The process is repeated until the 24m depth is reached. Hereinafter this will be referred to as the “Deformation Analysis”. In the second construction model the excavation and the lining installation take place in the same construction stage. Hereinafter this will be referred to as the “Stresses Analysis”. The excavation proceeds in steps of 1.5m of soil. The Mohr-Coulomb model is employed to simulate the constitutive behaviour of Alluvial deposits. This model is available in the FE programs used herein hence comparison of results for the three software outputs is facilitated. However, the Mohr-Coulomb (MC) model results on excessive uplift of the excavation floor, and a second set of calculations is performed with the use of the Hardening-Soil (HS) model which is available in the 2D and 3D versions of Plaxis and a comparison is made between the results based on the MC and HS models. Extensive parametric studies are performed to study the behaviour of such circular shafts in Alluvial deposits formation. The influences of construction stages simulation and the constitutive model used (6-noded model or 15-noded model) on the maximum hoop force, bending moment, shear and deflection of the shaft wall are investigated.	en
heal.advisorName	Γεωργιαννού, Βασιλική	el
heal.committeeMemberName	Γερόλυμος Νικόλαος	el
heal.committeeMemberName	Γκαζέτας, Γεώργιος	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Μηχανικών Μεταλλείων Μεταλλουργών	el
heal.academicPublisherID	ntua
heal.numberOfPages	150 σ.	el
heal.fullTextAvailability	true