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《岩石力学与岩土工程学报(英文版)》 2013-03
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Homogenization in clay barriers and seals:Two case studies

A.Gens a,,B.Valleján a,M.T.Zandarín a,M.Sánchez b a Department of Geotechnical Engineering and Geosciences, Universitat Politècnica de Catalunya, Barcelona, Spain b Zachry Department of Civil Engineering, Texas A&M University, College Station, TX, USA  
The paper presents two case studies that provide information on the process of homogenization of initially heterogeneous clay barriers and seals. The first case is the canister retrieval test performed in the Asp Hard Rock Laboratory (Sweden). The heterogeneity arises from the use of a combination of blocks and pellets to construct the engineered barrier. The degree of homogenization achieved by the end of the tests is evaluated from data obtained during the dismantling of the test. To assist in the interpretation of the test, a fully coupled thermo-hydro-mechanical (THM) analysis has been carried out. The second case involves the shaft sealing test performed in the HADES underground research laboratory (URL) in Mol (Belgium). Here the seal is made up of a heterogeneous mixture of bentonite pellets and bentonite powders. In addition to the full scale test, the process of homogenization of the mixture has also been observed in the laboratory using X-ray tomography. Both field test and laboratory tests are successfully modelled by a coupled hydro-mechanical (HM) analysis using a double structure constitutive law. The paper concludes with some considerations on the capability of highly expansive materials to provide a significant degree of homogenization upon hydration.
【Fund】: co-funded by ANDRA CIEMAT ONDRAF-NIRAS and the European Commission (EC contracts FIKWCT-2000-00010 and STRP-036458);; The support of the Spanish Ministry of Science and Innovation trough grant BIA2011-27217 is also gratefully acknowledged
【CateGory Index】: TL942
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1 A.Gens1*,L.do N.Guimares2,S.Olivella1,M.Sánchez3 1 Department of Geotechnical Engineering and Geosciences,Technical University of Catalonia,Barcelona,Spain 2 Universidade Federal de Pernambuco,Recife,Brazil 3 Texas A & M University,College Station,USA;Modelling thermo-hydro-mechano-chemical interactions for nuclear waste disposal[J];岩石力学与岩土工程学报(英文版);2010-02
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