{"id":{"repo_id":"tu-berlin","oai_identifier":"oai:depositonce.tu-berlin.de:11303/24503"},"canonical_url":"https://search.dev.ndltd.org/etd/tu-berlin/oai:depositonce.tu-berlin.de:11303/24503","repository":{"repo_id":"tu-berlin","name":"Technische Universität Berlin","base_url":"https://api-depositonce.tu-berlin.de/server/oai/request"},"display":{"title":"ALE and CEL formulations of pile installation in sand","abstract":"Numerical simulation of large deformation problem is challenging due to various factors including large soil deformation, non-linear behavior of soil, the potential influence of pore water, and high computation cost. This work presents a a sophisticated numerical model which addresses the aforementioned aspects. A key feature of the numerical model is the capability to simulate potential pile tip damage during the installation process. Then numerical model employs Multi-Material Arbitrary Lagrangian-Eulerian (MMALE) method to solve the issues associated with large deformation. The performance of MMALE is evaluated against several benchmarks for which analytical and experimental results are available. An advanced constitutive model, based on hypoplasticity concept, is used to model sandy soils commonly encountered in the German northern sea bight. These models offer the advantage of capturing complex soil behavior, including changes in stress and density states. The material model is verified using element tests and subsequently integrated with the MMALE element formulation to simulate various pile installation problems. The accuracy of the numerical model is checked against the measurements. In case of any discrepancies, the underlying reasons are discussed. In addition, a hydro-mechanically coupled formulation for the MMALE method is developed to simulate a saturated soil, i.e., soil whose pores are filled with water. The theory of the coupled formulation is discussed in detail, and assumptions made to develop the current formulation are explained. Later, the performance of the coupled formulation is investigated in various benchmarks ranging from one-element tests to 2D and 3D consolidation problems. The numerical model is further adapted for parallel computation to enable calculation on high-performance computing platforms. Following verification, this parallelized numerical tool is employed to simulate large-scale problems. The use of parallel computation significantly reduces the computational time and provides accurate results.","abstract_html":"Numerical simulation of large deformation problem is challenging due to various factors including large soil deformation, non-linear behavior of soil, the potential influence of pore water, and high computation cost. This work presents a a sophisticated numerical model which addresses the aforementioned aspects. A key feature of the numerical model is the capability to simulate potential pile tip damage during the installation process. Then numerical model employs Multi-Material Arbitrary Lagrangian-Eulerian (MMALE) method to solve the issues associated with large deformation. The performance of MMALE is evaluated against several benchmarks for which analytical and experimental results are available. An advanced constitutive model, based on hypoplasticity concept, is used to model sandy soils commonly encountered in the German northern sea bight. These models offer the advantage of capturing complex soil behavior, including changes in stress and density states. The material model is verified using element tests and subsequently integrated with the MMALE element formulation to simulate various pile installation problems. The accuracy of the numerical model is checked against the measurements. In case of any discrepancies, the underlying reasons are discussed. In addition, a hydro-mechanically coupled formulation for the MMALE method is developed to simulate a saturated soil, i.e., soil whose pores are filled with water. The theory of the coupled formulation is discussed in detail, and assumptions made to develop the current formulation are explained. Later, the performance of the coupled formulation is investigated in various benchmarks ranging from one-element tests to 2D and 3D consolidation problems. The numerical model is further adapted for parallel computation to enable calculation on high-performance computing platforms. Following verification, this parallelized numerical tool is employed to simulate large-scale problems. The use of parallel computation significantly reduces the computational time and provides accurate results.","abstract_has_math":false,"creators":["Daryaei, Reza"],"institution":null,"degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Rackwitz, Frank","Aubram, Daniel"],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025","date_published":"2025","updated_at":"2026-07-27T21:28:54Z","subjects":[],"languages":["en"],"rights":[],"rights_urls":["https://creativecommons.org/licenses/by/4.0/"],"identifier_entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://doi.org/10.14279/depositonce-23319"],"render_values":[{"text":"https://doi.org/10.14279/depositonce-23319","href":"https://doi.org/10.14279/depositonce-23319","code":true}]}]},"links":{"outbound_url":"https://depositonce.tu-berlin.de/handle/11303/24503","outbound_label":"Repository record","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Rackwitz, Frank","Aubram, Daniel"]},{"key":"dc:creator","label":"Author","values":["Daryaei, Reza"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-04-24T09:25:19Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2025-04-24T09:25:19Z"]},{"key":"dc:date.issued","label":"Date","values":["2025"]},{"key":"dc:type","label":"Dc Type","values":["Doctoral Thesis"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights.uri","label":"Rights URI","values":["https://creativecommons.org/licenses/by/4.0/"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://depositonce.tu-berlin.de/handle/11303/24503","https://doi.org/10.14279/depositonce-23319"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Numerical simulation of large deformation problem is challenging due to various factors including large soil deformation, non-linear behavior of soil, the potential influence of pore water, and high computation cost. This work presents a a sophisticated numerical model which addresses the aforementioned aspects. A key feature of the numerical model is the capability to simulate potential pile tip damage during the installation process. Then numerical model employs Multi-Material Arbitrary Lagrangian-Eulerian (MMALE) method to solve the issues associated with large deformation. The performance of MMALE is evaluated against several benchmarks for which analytical and experimental results are available. An advanced constitutive model, based on hypoplasticity concept, is used to model sandy soils commonly encountered in the German northern sea bight. These models offer the advantage of capturing complex soil behavior, including changes in stress and density states. The material model is verified using element tests and subsequently integrated with the MMALE element formulation to simulate various pile installation problems. The accuracy of the numerical model is checked against the measurements. In case of any discrepancies, the underlying reasons are discussed. In addition, a hydro-mechanically coupled formulation for the MMALE method is developed to simulate a saturated soil, i.e., soil whose pores are filled with water. The theory of the coupled formulation is discussed in detail, and assumptions made to develop the current formulation are explained. Later, the performance of the coupled formulation is investigated in various benchmarks ranging from one-element tests to 2D and 3D consolidation problems. The numerical model is further adapted for parallel computation to enable calculation on high-performance computing platforms. Following verification, this parallelized numerical tool is employed to simulate large-scale problems. The use of parallel computation significantly reduces the computational time and provides accurate results.","Die numerische Simulation von Problemen mit großen Deformationen ist eine Herausforderung aufgrund verschiedener Faktoren, wie z. B. großer Bodenverformungen, des nichtlinearen Verhaltens des Bodens, des potenziellen Einflusses von Porenwasser und des hohen Rechenaufwands. Diese Arbeit präsentiert ein hochentwickeltes numerisches Modell, das die genannten Aspekte berücksichtigt. Ein wesentliches Merkmal des numerischen Modells ist die Fähigkeit, potentielle Schäden an der Pfahlspitze während des Installationsprozesses zu simulieren. Das numerische Modell verwendet die Multi-Material Arbitrary Lagrangian-Eulerian (MMALE)-Methode, um die mit großen Deformationen verbundenen Probleme zu lösen. Die Leistungsfähigkeit von MMALE wird anhand mehrerer Benchmarks evaluiert, für die analytische und experimentelle Ergebnisse vorliegen. Ein fortschrittliches Stoffmodell, das auf dem Konzept der Hypoplastizität basiert, wird verwendet, um sandige Böden zu modellieren, die häufig in der Deutschen Bucht in der Nordsee vorkommen. Diese Modelle bieten den Vorteil, komplexes Bodenverhalten zu erfassen, einschließlich Änderungen des Spannungs- und Dichtezustands. Das Materialmodell wird anhand von Elementversuchen verifiziert und anschließend in die MMALE-Elementformulierung integriert, um verschiedene Pfahlinstallationsprobleme zu simulieren. Die Genauigkeit des numerischen Modells wird anhand von Messungen überprüft. Bei etwaigen Abweichungen werden die zugrunde liegenden Gründe diskutiert. Zusätzlich wird eine hydro-mechanisch gekoppelte Formulierung für die MMALE entwickelt, um einen gesättigten Boden zu simulieren, d. h. einen Boden, dessen Poren mit Wasser gefüllt sind. Die Theorie der gekoppelten Formulierung wird detailliert erläutert, und die Annahmen, die bei der Entwicklung der vorliegenden Formulierung getroffen wurden, werden erklärt. Anschließend wird die Leistungsfähigkeit der gekoppelten Formulierung in verschiedenen Benchmarks untersucht, die von Ein-Element-Versuchen bis hin zu 2D- und 3D-Konsolidierungsproblemen reichen. Das numerische Modell wird ferner für die Parallelrechnung angepasst, um Berechnungen auf Hochleistungsrechnerplattformen zu ermöglichen. Nach der Verifizierung wird dieses parallelisierte numerische Werkzeug verwendet, um großformatige Probleme zu simulieren. Der Einsatz von Parallelrechnung reduziert die Rechenzeit erheblich und liefert genaue Ergebnisse."]},{"key":"dc:title","label":"Title","values":["ALE and CEL formulations of pile installation in sand"]}]}],"canonical_facts":{"dc:contributor.advisor":["Rackwitz, Frank","Aubram, Daniel"],"dc:creator":["Daryaei, Reza"],"dc:date.accessioned":["2025-04-24T09:25:19Z"],"dc:date.available":["2025-04-24T09:25:19Z"],"dc:date.issued":["2025"],"dc:description.abstract":["Numerical simulation of large deformation problem is challenging due to various factors including large soil deformation, non-linear behavior of soil, the potential influence of pore water, and high computation cost. This work presents a a sophisticated numerical model which addresses the aforementioned aspects. A key feature of the numerical model is the capability to simulate potential pile tip damage during the installation process. Then numerical model employs Multi-Material Arbitrary Lagrangian-Eulerian (MMALE) method to solve the issues associated with large deformation. The performance of MMALE is evaluated against several benchmarks for which analytical and experimental results are available. An advanced constitutive model, based on hypoplasticity concept, is used to model sandy soils commonly encountered in the German northern sea bight. These models offer the advantage of capturing complex soil behavior, including changes in stress and density states. The material model is verified using element tests and subsequently integrated with the MMALE element formulation to simulate various pile installation problems. The accuracy of the numerical model is checked against the measurements. In case of any discrepancies, the underlying reasons are discussed. In addition, a hydro-mechanically coupled formulation for the MMALE method is developed to simulate a saturated soil, i.e., soil whose pores are filled with water. The theory of the coupled formulation is discussed in detail, and assumptions made to develop the current formulation are explained. Later, the performance of the coupled formulation is investigated in various benchmarks ranging from one-element tests to 2D and 3D consolidation problems. The numerical model is further adapted for parallel computation to enable calculation on high-performance computing platforms. Following verification, this parallelized numerical tool is employed to simulate large-scale problems. The use of parallel computation significantly reduces the computational time and provides accurate results.","Die numerische Simulation von Problemen mit großen Deformationen ist eine Herausforderung aufgrund verschiedener Faktoren, wie z. B. großer Bodenverformungen, des nichtlinearen Verhaltens des Bodens, des potenziellen Einflusses von Porenwasser und des hohen Rechenaufwands. Diese Arbeit präsentiert ein hochentwickeltes numerisches Modell, das die genannten Aspekte berücksichtigt. Ein wesentliches Merkmal des numerischen Modells ist die Fähigkeit, potentielle Schäden an der Pfahlspitze während des Installationsprozesses zu simulieren. Das numerische Modell verwendet die Multi-Material Arbitrary Lagrangian-Eulerian (MMALE)-Methode, um die mit großen Deformationen verbundenen Probleme zu lösen. Die Leistungsfähigkeit von MMALE wird anhand mehrerer Benchmarks evaluiert, für die analytische und experimentelle Ergebnisse vorliegen. Ein fortschrittliches Stoffmodell, das auf dem Konzept der Hypoplastizität basiert, wird verwendet, um sandige Böden zu modellieren, die häufig in der Deutschen Bucht in der Nordsee vorkommen. Diese Modelle bieten den Vorteil, komplexes Bodenverhalten zu erfassen, einschließlich Änderungen des Spannungs- und Dichtezustands. Das Materialmodell wird anhand von Elementversuchen verifiziert und anschließend in die MMALE-Elementformulierung integriert, um verschiedene Pfahlinstallationsprobleme zu simulieren. Die Genauigkeit des numerischen Modells wird anhand von Messungen überprüft. Bei etwaigen Abweichungen werden die zugrunde liegenden Gründe diskutiert. Zusätzlich wird eine hydro-mechanisch gekoppelte Formulierung für die MMALE entwickelt, um einen gesättigten Boden zu simulieren, d. h. einen Boden, dessen Poren mit Wasser gefüllt sind. Die Theorie der gekoppelten Formulierung wird detailliert erläutert, und die Annahmen, die bei der Entwicklung der vorliegenden Formulierung getroffen wurden, werden erklärt. Anschließend wird die Leistungsfähigkeit der gekoppelten Formulierung in verschiedenen Benchmarks untersucht, die von Ein-Element-Versuchen bis hin zu 2D- und 3D-Konsolidierungsproblemen reichen. Das numerische Modell wird ferner für die Parallelrechnung angepasst, um Berechnungen auf Hochleistungsrechnerplattformen zu ermöglichen. Nach der Verifizierung wird dieses parallelisierte numerische Werkzeug verwendet, um großformatige Probleme zu simulieren. Der Einsatz von Parallelrechnung reduziert die Rechenzeit erheblich und liefert genaue Ergebnisse."],"dc:identifier.uri":["https://depositonce.tu-berlin.de/handle/11303/24503","https://doi.org/10.14279/depositonce-23319"],"dc:language.iso":["en"],"dc:rights.uri":["https://creativecommons.org/licenses/by/4.0/"],"dc:title":["ALE and CEL formulations of pile installation in sand"],"dc:type":["Doctoral Thesis"]},"updated_at":"2026-07-27T21:28:54Z"}