Contributed Talk


Parameter identification applying in complex thermo-hydro-mechanical problems like the design of buffer elements


Long Nguyen-Tuan1, Tom Lahmer1, Maria Datcheva2, Eugenia Stoimenova2, Tom Schanz3
1Bauhaus-Universitaet Weimar, Germany; 2Bulgarian Academy of Sciences, Bulgaria; 3Ruhr-Universität Bochum, Germany

Abstract

This study contributes to the identification of coupled THM constitutive model parameters via back analysis against information-rich experiments. A sampling based back analysis approach is proposed comprising both the model parameter identification and the assessment of the reliability of identified model parameters. The results obtained in the context of buffer elements indicate that sensitive parameter estimates generally obey the normal distribution. According to the sensitivity of the parameters and the probability distribution of the samples we can provide confidence intervals for the estimated parameters and thus allow a qualitative estimation on the identified parameters which are in future work used as inputs for prognosis computations of buffer elements. These elements play e.g. an important role in the design of nuclear waste repositories.



ISSN 1611 - 4086 | © IKM 2015