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Cyclic Lateral Response of a Pile Group Embedded in Offshore Cohesionless Substrata with Inclined Layer Interface
https://orcid.org/http://orcid.org/0000-0002-4486-6426
https://orcid.org/http://orcid.org/0009-0001-4528-7629
https://orcid.org/http://orcid.org/0000-0001-7007-2729
https://orcid.org/http://orcid.org/0000-0002-9950-8810
In the marine environment, pile foundations supporting the near off-shore structures are often subjected to continuous lateral cyclic loads originating from the ocean waves along with the loads from superstructure. Offshore piles are often bored or driven deep in to the seabed passing through uniform or undulating layers of soft loose sand or compressible clays. Accordingly, their lateral responses are governed by complex soil-pile interaction. In conventional approach, soil strata are considered to have multiple parallel soil layers of uniform thickness. However, in this study, the soil layer interface is considered to be inclined which intersects the pile axes at different depths depending on their position within the group. 3D finite element method is used to model this complex soil-pile interaction and lateral behaviour of a 3×3 pile group, bored in a substrata comprising two cohesionless layers distinguished by an inclined interface. To simulate the wave-loading, a low-frequency two-way cyclic load is applied on the pile-heads. The lateral displacement is observed to be higher for a steeper inclination of the interface. When subjected to cyclic loading, the cohesionless soil tend to densify around the pile and the required number of cycles for the densification is found to be influenced by the interface inclination as well. The p-y curves highlight that the cyclic response of the pile group depends on the position of the piles within the inclined layering of the off-shore foundation soil bed as well as the direction of loading on the pile group.
Cyclic Lateral Response of a Pile Group Embedded in Offshore Cohesionless Substrata with Inclined Layer Interface
https://orcid.org/http://orcid.org/0000-0002-4486-6426
https://orcid.org/http://orcid.org/0009-0001-4528-7629
https://orcid.org/http://orcid.org/0000-0001-7007-2729
https://orcid.org/http://orcid.org/0000-0002-9950-8810
In the marine environment, pile foundations supporting the near off-shore structures are often subjected to continuous lateral cyclic loads originating from the ocean waves along with the loads from superstructure. Offshore piles are often bored or driven deep in to the seabed passing through uniform or undulating layers of soft loose sand or compressible clays. Accordingly, their lateral responses are governed by complex soil-pile interaction. In conventional approach, soil strata are considered to have multiple parallel soil layers of uniform thickness. However, in this study, the soil layer interface is considered to be inclined which intersects the pile axes at different depths depending on their position within the group. 3D finite element method is used to model this complex soil-pile interaction and lateral behaviour of a 3×3 pile group, bored in a substrata comprising two cohesionless layers distinguished by an inclined interface. To simulate the wave-loading, a low-frequency two-way cyclic load is applied on the pile-heads. The lateral displacement is observed to be higher for a steeper inclination of the interface. When subjected to cyclic loading, the cohesionless soil tend to densify around the pile and the required number of cycles for the densification is found to be influenced by the interface inclination as well. The p-y curves highlight that the cyclic response of the pile group depends on the position of the piles within the inclined layering of the off-shore foundation soil bed as well as the direction of loading on the pile group.
Cyclic Lateral Response of a Pile Group Embedded in Offshore Cohesionless Substrata with Inclined Layer Interface
https://orcid.org/http://orcid.org/0000-0002-4486-6426
https://orcid.org/http://orcid.org/0009-0001-4528-7629
https://orcid.org/http://orcid.org/0000-0001-7007-2729
https://orcid.org/http://orcid.org/0000-0002-9950-8810
In the marine environment, pile foundations supporting the near off-shore structures are often subjected to continuous lateral cyclic loads originating from the ocean waves along with the loads from superstructure. Offshore piles are often bored or driven deep in to the seabed passing through uniform or undulating layers of soft loose sand or compressible clays. Accordingly, their lateral responses are governed by complex soil-pile interaction. In conventional approach, soil strata are considered to have multiple parallel soil layers of uniform thickness. However, in this study, the soil layer interface is considered to be inclined which intersects the pile axes at different depths depending on their position within the group. 3D finite element method is used to model this complex soil-pile interaction and lateral behaviour of a 3×3 pile group, bored in a substrata comprising two cohesionless layers distinguished by an inclined interface. To simulate the wave-loading, a low-frequency two-way cyclic load is applied on the pile-heads. The lateral displacement is observed to be higher for a steeper inclination of the interface. When subjected to cyclic loading, the cohesionless soil tend to densify around the pile and the required number of cycles for the densification is found to be influenced by the interface inclination as well. The p-y curves highlight that the cyclic response of the pile group depends on the position of the piles within the inclined layering of the off-shore foundation soil bed as well as the direction of loading on the pile group.
Cyclic Lateral Response of a Pile Group Embedded in Offshore Cohesionless Substrata with Inclined Layer Interface
Lecture Notes in Civil Engineering
Huynh, Dat Vu Khoa (editor) / Doan, Hong (editor) / Cao, Tri Mai (editor) / Watson, Phil (editor) / Pal, Debasmita (author) / Basumatari, Devabrata (author) / Dey, Arindam (author) / Dasgupta, Kaustubh (author)
Vietnam Symposium on Advances in Offshore Engineering ; 2024 ; Hanoi, Vietnam
Proceedings of the 3rd Vietnam Symposium on Advances in Offshore Engineering ; Chapter: 32 ; 323-331
2025-04-01
9 pages
Article/Chapter (Book)
Electronic Resource
English
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