Print Email Facebook Twitter Coupled hydro-mechanical analysis of expansive soils Title Coupled hydro-mechanical analysis of expansive soils: Parametric identification and calibration Author Rawat, Abhishek (Ruhr-University Bochum) Lang, Linzhi (Ruhr-University Bochum) Baille, Wiebke (Ruhr-University Bochum) Dieudonné, A.A.M. (TU Delft Geo-engineering) Collin, Frederique (Universite de Liege) Date 2020 Abstract A methodology for identifying and calibrating the material parameters for a coupled hydro-mechanical problem is presented in this paper. For validation purpose, a laboratory-based water infiltration test was numerically simulated using finite element method (FEM). The test was conducted using a self-designed column-type experimental device, which mimicked the wetting process of a candidate backfill material in a nuclear waste repository. The real-time measurements of key state variables (e.g. water content, relative humidity, temperature, and total stresses) were performed with the monitoring sensors along the height of cylindrical soil sample. For numerical simulation, the modified Barcelona Basic Model (BBM) along with soil-water retention model for compacted bentonite was used. It shows that the identified model parameters successfully captured the moisture migration process under an applied hydraulic gradient in a bentonite-based compacted soil sample. A comparison between the measured and predicted values of total stresses both in axial and lateral directions along with other state variables revealed that heterogeneous moisture content was distributed along the hydration-path, resulting in non-uniform stress-deformation characteristics of soil. Subject Backfill materialCompacted bentoniteConstitutive modelingDeep geological repositoryHydro-mechanical couplingWater infiltration test To reference this document use: http://resolver.tudelft.nl/uuid:47fde44e-69b5-44e5-9f93-4de634fda0f7 DOI https://doi.org/10.1016/j.jrmge.2019.12.013 ISSN 1674-7755 Source Journal of Rock Mechanics and Geotechnical Engineering, 12 (3), 620-629 Part of collection Institutional Repository Document type journal article Rights © 2020 Abhishek Rawat, Linzhi Lang, Wiebke Baille, A.A.M. Dieudonné, Frederique Collin Files PDF 1_s2.0_S1674775520300500_main.pdf 3 MB Close viewer /islandora/object/uuid:47fde44e-69b5-44e5-9f93-4de634fda0f7/datastream/OBJ/view