Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors
This paper investigates the use of the BOTDA (Brillouin Optical Time-Domain Analysis) technology to monitor a large-scale bored pile wall in the field. Distributed fiber optic sensors (DFOSs) were deployed to measure internal temperature and strain changes during cement grouting, hardening, and exca...
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MDPI AG
2025-01-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/25/1/254 |
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| author | Chengyu Hong Chengkai Xu Weibin Chen Jianwei Liu Junkun Tan |
| author_facet | Chengyu Hong Chengkai Xu Weibin Chen Jianwei Liu Junkun Tan |
| author_sort | Chengyu Hong |
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| description | This paper investigates the use of the BOTDA (Brillouin Optical Time-Domain Analysis) technology to monitor a large-scale bored pile wall in the field. Distributed fiber optic sensors (DFOSs) were deployed to measure internal temperature and strain changes during cement grouting, hardening, and excavation-induced deformation of a secant pile wall. The study details the geological conditions and DFOS installation process. During grouting, the temperature increased by approximately 69 °C due to cement hydration 30 min post-grouting, while the strain decreased by 0.5% on average due to cement slurry shrinkage. During excavation, the temperature changes were minimal, but the excavation depth significantly influenced the strain distribution, with continuous compressive deformation observed in two monitored boreholes. Two analytical methods, the numerical integration method (NIM) and the finite difference method (FDM), were used to calculate the lateral pile displacement based on the monitored strain data. The results were compared with previous monitoring data, showing that the lateral displacement of the pile was minimal after excavation and was attributed to the high stiffness of the secant pile wall. This study demonstrates the effectiveness of DFOSs and BOTDA technology for monitoring complex pile wall behaviors during construction. |
| format | Article |
| id | doaj-art-4154c1e631584f8ea4cf0c2568f486d3 |
| institution | OA Journals |
| issn | 1424-8220 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | MDPI AG |
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| series | Sensors |
| spelling | doaj-art-4154c1e631584f8ea4cf0c2568f486d32025-08-20T02:36:03ZengMDPI AGSensors1424-82202025-01-0125125410.3390/s25010254Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic SensorsChengyu Hong0Chengkai Xu1Weibin Chen2Jianwei Liu3Junkun Tan4China Railway Seventh Group Co., Ltd., Zhengzhou 450016, ChinaDepartment of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, ChinaCollege of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaChina Railway Seventh Group Co., Ltd., Zhengzhou 450016, ChinaChina Railway Seventh Group Co., Ltd., Zhengzhou 450016, ChinaThis paper investigates the use of the BOTDA (Brillouin Optical Time-Domain Analysis) technology to monitor a large-scale bored pile wall in the field. Distributed fiber optic sensors (DFOSs) were deployed to measure internal temperature and strain changes during cement grouting, hardening, and excavation-induced deformation of a secant pile wall. The study details the geological conditions and DFOS installation process. During grouting, the temperature increased by approximately 69 °C due to cement hydration 30 min post-grouting, while the strain decreased by 0.5% on average due to cement slurry shrinkage. During excavation, the temperature changes were minimal, but the excavation depth significantly influenced the strain distribution, with continuous compressive deformation observed in two monitored boreholes. Two analytical methods, the numerical integration method (NIM) and the finite difference method (FDM), were used to calculate the lateral pile displacement based on the monitored strain data. The results were compared with previous monitoring data, showing that the lateral displacement of the pile was minimal after excavation and was attributed to the high stiffness of the secant pile wall. This study demonstrates the effectiveness of DFOSs and BOTDA technology for monitoring complex pile wall behaviors during construction.https://www.mdpi.com/1424-8220/25/1/254BOTDAdistributed fiber optic sensorsbored pile wallexcavation |
| spellingShingle | Chengyu Hong Chengkai Xu Weibin Chen Jianwei Liu Junkun Tan Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors Sensors BOTDA distributed fiber optic sensors bored pile wall excavation |
| title | Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors |
| title_full | Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors |
| title_fullStr | Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors |
| title_full_unstemmed | Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors |
| title_short | Monitoring Excavation-Induced Deformation of a Secant Pile Wall Using Distributed Fiber Optic Sensors |
| title_sort | monitoring excavation induced deformation of a secant pile wall using distributed fiber optic sensors |
| topic | BOTDA distributed fiber optic sensors bored pile wall excavation |
| url | https://www.mdpi.com/1424-8220/25/1/254 |
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