MODELLING COUPLED BEHAVIOUR OF A CLAY BARRIER AT HIGH TEMPERATURES
The design of repositories for the isolation of radioactive waste generally contemplates the use of expansive clays as a buffer material. In field conditions the clay barrier will be hydrated under confined conditions and will also undergo processes of heating, up to maximum of 100℃ (this is according to the Spanish concept for the isolation of high level radioactive waste). Based on experimental data, models have been developed to explain and reproduce the observed THM behaviour of expansive clays. However, an unplanned overheating in a large scale test has provided the opportunity to analyze the clay barrier under conditions quite different from the design ones. A THM formulation and constitutive model have been used to describe and reproduce the main aspects of the observed response of the clay barrier. The analysis provides a unique opportunity to test our current understanding of compacted expansive clay behaviour at temperatures not previously reached.
M.Sánchez A.Gens L.Guimaraes S.Olivella
Department of Civil Engineering, University of Strathclyde Glasgow, UK. Department of Geotechnical Engineering, Technical University of Catalonia, Spain Department of Civil Engineering, Universidade Federal do Pernambuco, Recife, Brazil
国际会议
南京
英文
210-215
2006-05-22（万方平台首次上网日期，不代表论文的发表时间）