Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site
Coral sand foundation formed by hydraulic fill often faces the problem of poor bearing capacity. This paper proposed for the first time to apply CFG pile composite foundation to coral sand sites to verify the feasibility of this scheme and understand its mechanical characteristics. Firstly, taking o...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Frontiers Media S.A.
2023-05-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1204989/full |
| _version_ | 1797816096701546496 |
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| author | Xiaobin Li Xiaobin Li Ruiyuan Zhang Zhao Yang Peishuai Chen Fuquan Ji Bing Wen |
| author_facet | Xiaobin Li Xiaobin Li Ruiyuan Zhang Zhao Yang Peishuai Chen Fuquan Ji Bing Wen |
| author_sort | Xiaobin Li |
| collection | DOAJ |
| description | Coral sand foundation formed by hydraulic fill often faces the problem of poor bearing capacity. This paper proposed for the first time to apply CFG pile composite foundation to coral sand sites to verify the feasibility of this scheme and understand its mechanical characteristics. Firstly, taking on-site coral sand as the research object, a pile sand interface shear test was conducted to clarify the mechanism of pile side friction. At the same time, the ultimate bearing capacity of CFG pile and its composite foundation was measured through in-situ static load tests. Then, based on the strength parameters of the pile sand interface revealed by indoor tests, numerical simulations were conducted to analyze the bearing characteristics of CFG piles and their composite foundations. Finally, a method for calculating the vertical bearing capacity of rigid piles in composite foundation considering interface parameters was proposed. The results showed that the bearing capacity characteristic values of single pile and composite foundation meet the design requirements; The interface friction angle and cohesion together increased the ultimate side friction by 64.41%; The load is mainly borne by the pile tip resistance, and the increase of the interface friction angle will make the proportion of the side friction load first increase and then decrease more obviously; The pile soil stress ratio first increased and then tended to stabilize as the interface strength increased. Compared with the field static load test results, the rationality of the calculation method for composite foundation rigid piles was verified. This study may have reference significance for the design and construction of coral sand foundation treatment in offshore island and reef projects. |
| first_indexed | 2024-03-13T08:32:38Z |
| format | Article |
| id | doaj.art-2bf4b15f7bb44a8a944eb9d12003353b |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-13T08:32:38Z |
| publishDate | 2023-05-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-2bf4b15f7bb44a8a944eb9d12003353b2023-05-31T04:35:38ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-05-011110.3389/feart.2023.12049891204989Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand siteXiaobin Li0Xiaobin Li1Ruiyuan Zhang2Zhao Yang3Peishuai Chen4Fuquan Ji5Bing Wen6CCCC Second Harbor Engineering Co, Ltd., Wuhan, ChinaFirst Engineering Co, Ltd. of CCCC Second Harbor Engineering Bureau, Wuhan, ChinaCCCC Second Harbor Engineering Co, Ltd., Wuhan, ChinaCCCC Second Harbor Engineering Co, Ltd., Wuhan, ChinaCCCC Second Harbor Engineering Co, Ltd., Wuhan, ChinaCCCC Second Harbor Engineering Co, Ltd., Wuhan, ChinaDesign Institute of the First Construction Engineering Co, Ltd. of China Construction Third Engineering Bureau, Wuhan, ChinaCoral sand foundation formed by hydraulic fill often faces the problem of poor bearing capacity. This paper proposed for the first time to apply CFG pile composite foundation to coral sand sites to verify the feasibility of this scheme and understand its mechanical characteristics. Firstly, taking on-site coral sand as the research object, a pile sand interface shear test was conducted to clarify the mechanism of pile side friction. At the same time, the ultimate bearing capacity of CFG pile and its composite foundation was measured through in-situ static load tests. Then, based on the strength parameters of the pile sand interface revealed by indoor tests, numerical simulations were conducted to analyze the bearing characteristics of CFG piles and their composite foundations. Finally, a method for calculating the vertical bearing capacity of rigid piles in composite foundation considering interface parameters was proposed. The results showed that the bearing capacity characteristic values of single pile and composite foundation meet the design requirements; The interface friction angle and cohesion together increased the ultimate side friction by 64.41%; The load is mainly borne by the pile tip resistance, and the increase of the interface friction angle will make the proportion of the side friction load first increase and then decrease more obviously; The pile soil stress ratio first increased and then tended to stabilize as the interface strength increased. Compared with the field static load test results, the rationality of the calculation method for composite foundation rigid piles was verified. This study may have reference significance for the design and construction of coral sand foundation treatment in offshore island and reef projects.https://www.frontiersin.org/articles/10.3389/feart.2023.1204989/fullcoral sandCFG pile composite foundationinterface strength parametersstatic side pressure coefficientbearing characteristics |
| spellingShingle | Xiaobin Li Xiaobin Li Ruiyuan Zhang Zhao Yang Peishuai Chen Fuquan Ji Bing Wen Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site Frontiers in Earth Science coral sand CFG pile composite foundation interface strength parameters static side pressure coefficient bearing characteristics |
| title | Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site |
| title_full | Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site |
| title_fullStr | Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site |
| title_full_unstemmed | Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site |
| title_short | Mechanical behavior analysis and bearing capacity calculation of CFG pile composite foundation on coral sand site |
| title_sort | mechanical behavior analysis and bearing capacity calculation of cfg pile composite foundation on coral sand site |
| topic | coral sand CFG pile composite foundation interface strength parameters static side pressure coefficient bearing characteristics |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1204989/full |
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