Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling
The lateral response of combined pile-raft foundations (CPRFs) adjacent to tunnel excavation is a challenging problem owing to the complexity of the pile-raft connections. In current engineering practices, the impact of these connections on the lateral performance of CPRFs is frequently overlooked,...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
KeAi Communications Co., Ltd.
2024-04-01
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| Series: | Underground Space |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2467967423001253 |
| _version_ | 1797377818014777344 |
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| author | Wenbo Gu Liyuan Tong Huangsong Pan Hongjiang Li |
| author_facet | Wenbo Gu Liyuan Tong Huangsong Pan Hongjiang Li |
| author_sort | Wenbo Gu |
| collection | DOAJ |
| description | The lateral response of combined pile-raft foundations (CPRFs) adjacent to tunnel excavation is a challenging problem owing to the complexity of the pile-raft connections. In current engineering practices, the impact of these connections on the lateral performance of CPRFs is frequently overlooked, despite their importance. To address this issue, this study conducted three-dimensional finite element analyses to evaluate the contribution of pile-raft connections to the tunnelling-induced lateral performance of CPRFs in saturated clay. In the analysis, both passive and active loading at the pile head could be considered by varying the tunnel depth. Several parameter studies, such as relative pile-raft modulus, pile embedded modulus, pile embedded depths, and pile shaft skin friction, were conducted to determine the optimal design parameters for CPRFs. The results indicate that pile-raft connections significantly affect the tunnelling-induced deflections and bending moments of pile groups. Inspired by the results, a simplified design method, the pile-raft connection coefficient Kc was proposed. Additionally, the pile-head restraint percentage was established to make a relationship with the pile-raft connection coefficient in order to assess the pile-raft connection and guide the pile-raft design. In this paper, the recommended range value of Kc is 10–200 and the range value of pile-head restraint percentage is 24%–42%. |
| first_indexed | 2024-03-08T19:57:51Z |
| format | Article |
| id | doaj.art-23f1c7a2acc44c1ca589462441343661 |
| institution | Directory Open Access Journal |
| issn | 2467-9674 |
| language | English |
| last_indexed | 2024-03-08T19:57:51Z |
| publishDate | 2024-04-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Underground Space |
| spelling | doaj.art-23f1c7a2acc44c1ca5894624413436612023-12-24T04:46:11ZengKeAi Communications Co., Ltd.Underground Space2467-96742024-04-0115176187Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnellingWenbo Gu0Liyuan Tong1Huangsong Pan2Hongjiang Li3Institute of Geotechnical Engineering, Southeast University, Nanjing 211189, China; Department of Architecture and Architectural Engineering, Kyoto University, Kyoto 6158540, JapanInstitute of Geotechnical Engineering, Southeast University, Nanjing 211189, China; Corresponding authors.School of Architecture and Civil Engineering, Xihua University, Chengdu 610039, ChinaInstitute of Geotechnical Engineering, Southeast University, Nanjing 211189, China; Corresponding authors.The lateral response of combined pile-raft foundations (CPRFs) adjacent to tunnel excavation is a challenging problem owing to the complexity of the pile-raft connections. In current engineering practices, the impact of these connections on the lateral performance of CPRFs is frequently overlooked, despite their importance. To address this issue, this study conducted three-dimensional finite element analyses to evaluate the contribution of pile-raft connections to the tunnelling-induced lateral performance of CPRFs in saturated clay. In the analysis, both passive and active loading at the pile head could be considered by varying the tunnel depth. Several parameter studies, such as relative pile-raft modulus, pile embedded modulus, pile embedded depths, and pile shaft skin friction, were conducted to determine the optimal design parameters for CPRFs. The results indicate that pile-raft connections significantly affect the tunnelling-induced deflections and bending moments of pile groups. Inspired by the results, a simplified design method, the pile-raft connection coefficient Kc was proposed. Additionally, the pile-head restraint percentage was established to make a relationship with the pile-raft connection coefficient in order to assess the pile-raft connection and guide the pile-raft design. In this paper, the recommended range value of Kc is 10–200 and the range value of pile-head restraint percentage is 24%–42%.http://www.sciencedirect.com/science/article/pii/S2467967423001253Combined pile-raft foundationsTunnellingLateral performancePile-raft connection |
| spellingShingle | Wenbo Gu Liyuan Tong Huangsong Pan Hongjiang Li Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling Underground Space Combined pile-raft foundations Tunnelling Lateral performance Pile-raft connection |
| title | Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling |
| title_full | Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling |
| title_fullStr | Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling |
| title_full_unstemmed | Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling |
| title_short | Influence of pile-raft connection on lateral performance of combined pile-raft foundations adjacent to tunnelling |
| title_sort | influence of pile raft connection on lateral performance of combined pile raft foundations adjacent to tunnelling |
| topic | Combined pile-raft foundations Tunnelling Lateral performance Pile-raft connection |
| url | http://www.sciencedirect.com/science/article/pii/S2467967423001253 |
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