Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation
“Pit-in-pit” foundations, where the overall pit is divided into inner and outer pits, present a wide range of engineering problems and yet have received little detailed study. Among the many factors that affect the stability of a deep foundation pit, loading and rainfall are the two most important....
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| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2019-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2019/2572034 |
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| author | Chun Zhu Kai Zhang Huan Cai Zhigang Tao Bo An Manchao He Xing Xia Jiankang Liu |
| author_facet | Chun Zhu Kai Zhang Huan Cai Zhigang Tao Bo An Manchao He Xing Xia Jiankang Liu |
| author_sort | Chun Zhu |
| collection | DOAJ |
| description | “Pit-in-pit” foundations, where the overall pit is divided into inner and outer pits, present a wide range of engineering problems and yet have received little detailed study. Among the many factors that affect the stability of a deep foundation pit, loading and rainfall are the two most important. Therefore, in this study, physical model experiments are carried out in the laboratory based on a pit-in-pit foundation that is typical of engineering applications in China, simulating the deformation of the system under different loading and rainfall flow conditions. Optical fibers along with constant resistance and large deformation (CRLD) bolts are adopted to collectively monitor the stress and strain inside the pit-in-pit foundation, assisted by fiber Bragg grating (FBG) displacement meters. The results of the monitoring show that the position of the inner pit relative to the outer pit has a strong influence on the stability of the outer pit. The side on which the inner pit is closest to the outer pit wall is the most prone to instability and should thus be reinforced. Comparison and analysis of monitoring results obtained with optical fibers and CRLD bolts allow a potentially dangerous slip surface to be identified, indicating the value of using this type of collective monitoring in deep foundation pits. |
| format | Article |
| id | doaj-art-ddb9acc77f844d9c9d06d566c2154a4e |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2019-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-ddb9acc77f844d9c9d06d566c2154a4e2025-08-20T03:26:21ZengWileyAdvances in Civil Engineering1687-80861687-80942019-01-01201910.1155/2019/25720342572034Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit FoundationChun Zhu0Kai Zhang1Huan Cai2Zhigang Tao3Bo An4Manchao He5Xing Xia6Jiankang Liu7College of Construction Engineering, Jilin University, Changchun 130026, ChinaState Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, ChinaChina Gold International Resources Corp. Ltd., ChinaState Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, ChinaState Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, ChinaCollege of Construction Engineering, Jilin University, Changchun 130026, ChinaState Key Laboratory for Geomechanics & Deep Underground Engineering, Beijing 100083, ChinaSchool of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki, Japan“Pit-in-pit” foundations, where the overall pit is divided into inner and outer pits, present a wide range of engineering problems and yet have received little detailed study. Among the many factors that affect the stability of a deep foundation pit, loading and rainfall are the two most important. Therefore, in this study, physical model experiments are carried out in the laboratory based on a pit-in-pit foundation that is typical of engineering applications in China, simulating the deformation of the system under different loading and rainfall flow conditions. Optical fibers along with constant resistance and large deformation (CRLD) bolts are adopted to collectively monitor the stress and strain inside the pit-in-pit foundation, assisted by fiber Bragg grating (FBG) displacement meters. The results of the monitoring show that the position of the inner pit relative to the outer pit has a strong influence on the stability of the outer pit. The side on which the inner pit is closest to the outer pit wall is the most prone to instability and should thus be reinforced. Comparison and analysis of monitoring results obtained with optical fibers and CRLD bolts allow a potentially dangerous slip surface to be identified, indicating the value of using this type of collective monitoring in deep foundation pits.http://dx.doi.org/10.1155/2019/2572034 |
| spellingShingle | Chun Zhu Kai Zhang Huan Cai Zhigang Tao Bo An Manchao He Xing Xia Jiankang Liu Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation Advances in Civil Engineering |
| title | Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation |
| title_full | Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation |
| title_fullStr | Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation |
| title_full_unstemmed | Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation |
| title_short | Combined Application of Optical Fibers and CRLD Bolts to Monitor Deformation of a Pit-in-Pit Foundation |
| title_sort | combined application of optical fibers and crld bolts to monitor deformation of a pit in pit foundation |
| url | http://dx.doi.org/10.1155/2019/2572034 |
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