Influence of Cross-Correlation on the Modelled Uncertainty in Stress–Strain Behavior of Soft Clays
Loading...
Access rights
openAccess
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Authors
Date
2024-07
Department
Major/Subject
Mcode
Degree programme
Language
en
Pages
18
Series
Geotechnical and Geological Engineering, Volume 42, issue 5, pp. 3213-3230
Abstract
Reliability-based design is increasingly being applied to geotechnical problems because it allows the robust consideration of various sources of uncertainty, such as the inherent variability of soil properties. Some soil properties, however, are mutually dependent, and ignoring this cross-correlation may lead to biased estimates of the probability of unsatisfactory performance. Hence, in this study, the Gaussian copula was used to evaluate how the applied cross-correlation or independence between the compressibility properties affects the uncertainty in the stress–strain response of two marine soft clays. Two settlement calculation methods were considered: the compression index and Janbu tangential stiffness methods. The correlation coefficients were defined from the site-specific oedometer data at two extensively studied clay sites, and from a database. The simulated oedometer curves were compared to the observed variability in the site-specific data. The settlements in the clay sublayers were then computed, and different cases were compared by means of boxplots. It is concluded that the Janbu method leads to a significant overestimation of uncertainty in settlement if the cross-correlation between the compressibility parameters is ignored. On contrary, the compression index method seems less sensitive to the assumed correlation structure, and as such, the parameters can be treated as independent in most cases.Description
Keywords
clay, compressibility, copula functions, multivariate distribution, soil statistics, reliability
Other note
Citation
Löfman, M & Korkiala-Tanttu, L 2024, ' Influence of Cross-Correlation on the Modelled Uncertainty in Stress–Strain Behavior of Soft Clays ', Geotechnical and Geological Engineering, vol. 42, no. 5, pp. 3213-3230 . https://doi.org/10.1007/s10706-023-02725-w