Dokument-ID Dokumenttyp Autoren/innen Persönliche Herausgeber/innen Haupttitel Abstract Auflage Verlagsort Verlag Herausgeber (Institution) Erscheinungsjahr Titel des übergeordneten Werkes Jahrgang/Band ISBN Veranstaltung Veranstaltungsort Beginndatum der Veranstaltung Enddatum der Veranstaltung Ausgabe/Heft Erste Seite Letzte Seite URN DOI Lizenz Datum der Freischaltung OPUS4-48505 Beitrag zu einem Tagungsband Geißler, Peter; Schwarz, Johannes; Cuéllar, Pablo; Hüsken, Götz; Baeßler, Matthias; Kühne, Hans-Carsten; Morrone, C. Compaction grouting to improve the pile bearing capacity in non-cohesive soil The aim of an ongoing research project is to develop a design approach for typical offshore driven piles (e.g. Jacket piles) based on the application of injections by compaction grouting directly at the pile shaft. The paper aims to present the results of laboratory and in-situ tests, which reveal the efficiency and the promising potential of the optimised foundation concept for a more economic dimensioning of pile foundations and to increase their bearing capacity in non-cohesive soil at any moment after installation. Cupertino, California, USA International Society of Offshore and Polar Engineers (ISOPE) 2019 Proceedings of the Twenty-ninth (2019) International Ocean and Polar Engineering Conference II 978-1-880653-85-2 Twenty-ninth International Ocean and Polar Engineering Conference Honolulu, HI, USA 16.06.2019 21.06.2019 2178 2184 2019-07-22 OPUS4-46004 Beitrag zu einem Tagungsband Geißler, Peter; Cuéllar, Pablo; Hüsken, Götz; Kühne, Hans-Carsten; Baeßler, Matthias Insights into compaction grouting for offshore pile foundations The authors are currently investigating the possibility to apply compaction grouting for offshore pile foundations (Jacket piles as well as monopiles) as a possible retrofitting technique for an optimised foundation concept. In this research project, we are developing a design approach aiming to predict the ideal amount and properties of a grout for a specific soil situation and desired improvement of pile bearing capacity after Installation and during service time. Both numerical and experimental tests have been carried out to investigate the injection process during which a highly viscous grout is injected into the soil under high pressure to displace and compact the surrounding soil without fracturing it. The implicit Material Point Method (MPM) based on a mixed formulation is the numerical technique chosen to deal with the expected large deformations and the arbitrary shape of the developing grout bulb. The usage of MPM prevents both the need of remeshing and the numerical instability induced by extensive mesh distortion. For validation with experimental results, we have constructed a testing chamber with one transparent sidewall. This chamber enables us to observe the injection process directly at the transparent vertical window and to measure the in-plane soil displacements and strains by means of the Digital Image Correlation (DIC) technique. The results already reveal the interrelation of soil and grout properties for a successful usage of this common ground improvement technique. 2018 Proceedings of the ASME 2018 37th International Conference on Ocean, Offshore and Arctic Engineering OMAE 2018 9 978-0-7918-5130-2 37th International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2018) Madrid, Spain 18.06.2018 22.06.2018 V009T10A013, 1 9 2018-09-21