Print Email Facebook Twitter Effects of Carbonate Distribution Inhomogeneity on the Improvement Level of Bio-cemented Sands Title Effects of Carbonate Distribution Inhomogeneity on the Improvement Level of Bio-cemented Sands: A DEM Study Author Zhang, A. (TU Delft Geo-engineering) Dieudonné, A.A.M. (TU Delft Geo-engineering) Contributor Barla, Marco (editor) Insana, Alessandra (editor) Di Donna, Alice (editor) Sterpi, Donatella (editor) Date 2023 Abstract Microbially induced carbonate precipitation (MICP) involves bacteria to drive calcite precipitation and naturally cement soils, thereby improving soils performance. Experimental studies have shown that bio-cemented specimen can suffer from severe spatial inhomogeneity of the calcite content, leading to large uncertainty in treatment efficiency prediction. To evaluate the effect of inhomogeneity on the mechanical behaviour of bio-cemented soils, the discrete element method (DEM) is used to model bio-cemented samples with a single carbonate distribution pattern (i.e. either bridging or contact cementing) but different characteristics of inhomogeneity. Both drained triaxial compression and triaxial extension simulations are carried out to evaluate the impact of inhomogeneity along different loading paths. The results indicate that inhomogeneity has different effects on bio-cemented samples depending on the carbonate distribution patterns and the loading path. Specifically, the shear strength in compression of samples exhibiting bridging cementation is largely affected by inhomogeneity, while the effect on shear strength in extension is negligible. On the other hand, samples with contact cementing show limited sensitivity to the variation of inhomogeneity under both triaxial compression and triaxial extension tests. Subject Bio-cemented soilDEMInhomogeneityMICPShear strength To reference this document use: http://resolver.tudelft.nl/uuid:c4721bbd-466b-4f2c-9dc0-5cb8441597f3 DOI https://doi.org/10.1007/978-3-031-12851-6_66 Publisher Springer Embargo date 2023-07-01 ISBN 9783031128509 Source Challenges and Innovations in Geomechanics: Proceedings of the 16th International Conference of IACMAG, 3 Event 6th International Conference of the International Association for Computer Methods and Advances in Geomechanics, IACMAG 2022, 2022-08-30 → 2022-09-02, Turin, Italy Series Lecture Notes in Civil Engineering, 2366-2557, 288 LNCE Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type conference paper Rights © 2023 A. Zhang, A.A.M. Dieudonné Files PDF 978_3_031_12851_6_66.pdf 1.18 MB Close viewer /islandora/object/uuid:c4721bbd-466b-4f2c-9dc0-5cb8441597f3/datastream/OBJ/view