DSpace DSpace UPC
 Català   Castellano   English  

E-prints UPC >
Altres >
Enviament des de DRAC >

Empreu aquest identificador per citar o enllaçar aquest ítem: http://hdl.handle.net/2117/9927

Ítem no disponible en accés obert per política de l'editorial

Arxiu Descripció MidaFormat
UnsatWaste2009Shanghai_Alonso&Romero_keynotelecture.pdf3,61 MBAdobe PDF Accés restringit

Citació: Alonso, E.; Hoffmann, C.; Romero, E. Pellet mixtures in isolation barriers. A: International Symposium on Unsaturated Soils Mechanics and Deep Geological Disposal of Nuclear Waste. "International Symposium on Unsaturated Soils Mechanics and Deep Geological Disposal of Nuclear Waste". Shangai: 2009, p. 1-22.
Títol: Pellet mixtures in isolation barriers
Autor: Alonso Pérez de Agreda, Eduardo Veure Producció científica UPC; Hoffmann Jauge, Christian Veure Producció científica UPC; Romero Morales, Enrique Edgar Veure Producció científica UPC
Data: 2009
Tipus de document: Conference report
Resum: Granular mixtures made of high-density pellets of bentonite are being evaluated as an alternative buffer material for waste isolation. Ease of handing is an often-mentioned advantage. The paper describes the experimental program performed to characterize the hydromechanical behaviour of compacted pellet’s mixtures. Grain size distribution was adjusted to a maximum pellet size compatible with the specimen’s dimensions. Dry densities of statically compacted specimens varied in most of the cases in the range: 1.3 to 1.5 Mg/m3. Pellets had a very high dry density, close to 2 Mg/m3. To outstanding characteristics of these mixture is its discontinuous porosity. Pore sizes of the compacted pellets vary around 10 nm. However the inter-pellet size of the pores is four to five orders of magnitude higher. This double porosity and the highly expansive nature of the pellets controlled all the hydraulic and mechanical properties of the mixture. Test performed include infiltration tests using different water injection rates and mechanisms of water transfer (in liquid and vapour phases), suction controlled oedometer test and swelling pressure tests. The interpretation of some of the tests performed required backanalysis procedures using a Hydro-Mechanical(HM)computer code. Material response was studied within the framework of the elastoplastic constitutive model proposed by Alonso et al.(1990) (Barcelona Basic Model, BBM). Parameters for the model were identified and also a set of hydraulic laws necessary to perform coupled HM analysis. A large scale in situ test (the “EB” test in Mont Terri, Switzerland) is described and analyzed. Rock barrier parameters were adjusted on the basis of available test. The test excavation, barrier emplacement and forced hydration was simulated by means of the CODE_BRIGHT program. The comparison between measurement and computed results include data on relative humidity in the rock and the buffer, swelling pressures and displacement.
URI: http://hdl.handle.net/2117/9927
Apareix a les col·leccions:MSR - Mecànica del Sòls i de les Roques. Ponències/Comunicacions de congressos
ETCG – Departament d’Enginyeria del Terreny, Cartogràfica i Geofísica. Ponències/Comunicacions de congressos
Altres. Enviament des de DRAC
Comparteix:


Stats Mostra les estadístiques d'aquest ítem

SFX Query

Tots els drets reservats. Aquesta obra està protegida pels drets de propietat intel·lectual i industrial corresponents. Sense perjudici de les exempcions legals existents, queda prohibida la seva reproducció, distribució, comunicació pública o transformació sense l'autorització del titular dels drets.

Per a qualsevol ús que se'n vulgui fer no previst a la llei, dirigiu-vos a: sepi.bupc@upc.edu

 

Valid XHTML 1.0! Programari DSpace Copyright © 2002-2004 MIT and Hewlett-Packard Comentaris
Universitat Politècnica de Catalunya. Servei de Biblioteques, Publicacions i Arxius