Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing
Defects in cast-in-situ piles have an adverse impact on load transfer at the pile‒soil interface and pile bearing capacity. In recent years, thermal integrity profiling (TIP) has been developed to measure temperature profiles of cast-in-situ piles, enabling the detection of structural defects or ano...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-12-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775523001166 |
| _version_ | 1797430026866524160 |
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| author | Jing Wang Honghu Zhu Daoyuan Tan Zili Li Jie Li Chao Wei Bin Shi |
| author_facet | Jing Wang Honghu Zhu Daoyuan Tan Zili Li Jie Li Chao Wei Bin Shi |
| author_sort | Jing Wang |
| collection | DOAJ |
| description | Defects in cast-in-situ piles have an adverse impact on load transfer at the pile‒soil interface and pile bearing capacity. In recent years, thermal integrity profiling (TIP) has been developed to measure temperature profiles of cast-in-situ piles, enabling the detection of structural defects or anomalies at the early stage of construction. However, using this integrity testing method to evaluate potential defects in cast-in-situ piles requires a comprehensive understanding of the mechanism of hydration heat transfer from piles to surrounding soils. In this study, small-scale model tests were conducted in laboratory to investigate the performance of TIP in detecting pile integrity. Fiber-optic distributed temperature sensing (DTS) technology was used to monitor detailed temperature variations along model piles in sand. Additionally, sensors were installed in sand to measure water content and matric suction. An interpretation method against available DTS-based thermal profiles was proposed to reveal the potential defective regions. It shows that the temperature difference between normal and defective piles is more obvious in wet sand. In addition, there is a critical zone of water migration in sand due to the water absorption behavior of cement and temperature transfer-induced water migration in the early-age concrete setting. These findings could provide important insight into the improvement of the TIP testing method for field applications. |
| first_indexed | 2024-03-09T09:21:43Z |
| format | Article |
| id | doaj.art-03bc3ed94aeb4d8699687e8c07c4dbe7 |
| institution | Directory Open Access Journal |
| issn | 1674-7755 |
| language | English |
| last_indexed | 2024-03-09T09:21:43Z |
| publishDate | 2023-12-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj.art-03bc3ed94aeb4d8699687e8c07c4dbe72023-12-02T06:58:57ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552023-12-01151232443255Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensingJing Wang0Honghu Zhu1Daoyuan Tan2Zili Li3Jie Li4Chao Wei5Bin Shi6School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, ChinaSchool of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; Corresponding author.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, ChinaDepartment of Civil and Environmental Engineering, School of Engineering and Architecture, University College Cork, College Road, Cork, T12 K8AF, IrelandSchool of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, ChinaSchool of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, ChinaSchool of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, ChinaDefects in cast-in-situ piles have an adverse impact on load transfer at the pile‒soil interface and pile bearing capacity. In recent years, thermal integrity profiling (TIP) has been developed to measure temperature profiles of cast-in-situ piles, enabling the detection of structural defects or anomalies at the early stage of construction. However, using this integrity testing method to evaluate potential defects in cast-in-situ piles requires a comprehensive understanding of the mechanism of hydration heat transfer from piles to surrounding soils. In this study, small-scale model tests were conducted in laboratory to investigate the performance of TIP in detecting pile integrity. Fiber-optic distributed temperature sensing (DTS) technology was used to monitor detailed temperature variations along model piles in sand. Additionally, sensors were installed in sand to measure water content and matric suction. An interpretation method against available DTS-based thermal profiles was proposed to reveal the potential defective regions. It shows that the temperature difference between normal and defective piles is more obvious in wet sand. In addition, there is a critical zone of water migration in sand due to the water absorption behavior of cement and temperature transfer-induced water migration in the early-age concrete setting. These findings could provide important insight into the improvement of the TIP testing method for field applications.http://www.sciencedirect.com/science/article/pii/S1674775523001166Geotechnical monitoringDistributed temperature sensing (DTS)Pile defectFiber-optic thermal integrity profiling (FO-TIP)Heat transferPile‒soil interface |
| spellingShingle | Jing Wang Honghu Zhu Daoyuan Tan Zili Li Jie Li Chao Wei Bin Shi Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing Journal of Rock Mechanics and Geotechnical Engineering Geotechnical monitoring Distributed temperature sensing (DTS) Pile defect Fiber-optic thermal integrity profiling (FO-TIP) Heat transfer Pile‒soil interface |
| title | Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing |
| title_full | Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing |
| title_fullStr | Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing |
| title_full_unstemmed | Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing |
| title_short | Thermal integrity profiling of cast-in-situ piles in sand using fiber-optic distributed temperature sensing |
| title_sort | thermal integrity profiling of cast in situ piles in sand using fiber optic distributed temperature sensing |
| topic | Geotechnical monitoring Distributed temperature sensing (DTS) Pile defect Fiber-optic thermal integrity profiling (FO-TIP) Heat transfer Pile‒soil interface |
| url | http://www.sciencedirect.com/science/article/pii/S1674775523001166 |
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