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Performance monitoring of superlarge-diameter rock-socketed piles by optic fiber sensors

  • Haofeng Xing , Jie Han and Chunfeng Li
Published/Copyright: June 19, 2017
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Materials Testing
From the journal Materials Testing Volume 59 Issue 6

Abstract

The available fiber optic sensing technology is increasingly becoming a superior nondestructive means for stress monitoring of civil engineering structures. To understand the mechanical properties of superlarge-diameter rock-socketed piles under complicated geological conditions, field tests were performed using distributed fiber optic sensors in this paper. At first, the feasibility of fiber optic sensing technology in testing compressive stress of piles was testified by indoor model tests and its correlation coefficient was acquired as well. Then, the in-situ installation of fiber optic sensors were carried out on the superlarge-diameter rock-socketed piles of Hezhang Bridge. By the testing data collection during construction and the data treatment and analysis, the bearing behaviors and load transfer mechanism of superlarge-diameter rock-socketed piles were explored. Based on the comparison of the testing results and the actual force and settlement of the support engineering, the fiber optic sensing technology in monitoring pile stress was further testified to be feasible and proposed as well. The research results in this paper have reference value to pile theory and the application of fiber optic sensing technology on similar projects.

Kurzfassung

Die Technik der verteilten faseroptischen Sensoren wird zum bevorzugten Verfahren für das Spannungsmonitoring von Ingenieurbauwerken. Um die mechanischen Eigenschaften von felsverankerten Pfählen mit extrem großen Durchmessern unter komplizierten geologischen Bedingungen zu verstehen, wurden Feldversuche mittels verteilter faseroptischer Sensoren durchgeführt und im vorliegenden Beitrag vorgestellt. Zunächst wurde die Anwendbarkeit der faseroptischen Sensortechnik zur Prüfung der Druckspannung in den Pfählen überprüft, und zwar mittels Modellversuchen im Labor, wobei auch der Korrelationskoeffizient ermittelt wurde. Anschließend wurden faseroptische Sensoren in felsverankerten Pfählen mit extrem großen Durchmessern installiert, und zwar wählte man die Pfähle der Hezhang-Brücke. Während der Testdatensammlung, deren Behandlung und Analyse wurden das Lagerungsverhalten und die Lastübertragungsmechanismen der felsverankerten Pfähle mit übergroßem Durchmesser untersucht. Basierend auf dem Vergleich der Prüfergebnisse und der tatsächlichen Beanspruchung und dem Ansatz zum Setzen von Unterstützungen wurde die faseroptische Sensorik zum Spannungsmonitoring in Pfählen weiter als möglich sowie empfohlen bestätigt. Die Forschungsergebnisse, über die in diesem Beitrag berichtet wird, haben für die Theorie von Pfahlgründungen und für die Anwendbarkeit der faseroptischen Sensortechnik in ähnlichen Projekten Referenzwert.

*Correspondence Address, Associate Prof. Dr. Haofeng Xing, College of Civil Engineering, Tongji University, Shanghai, 200092, P. R. China, E-mail: , ,

Prof. Haofeng Xing, born 1968, received PhD degree in Civil Engineering from Zhejiang University in Hangzhou, China in 2006. He is a committee member of the Chinese Geosynthetics Association and takes charge of two National Natural Science Foundations of China. He participates in four National Natural Science Foundations and one 863 project. In 2009, he became Associate Professor at the College of Civil Engineering, Tongji University, Shanghai, China.

Jie Han, born 1991, received her Bachelor's degree in Geological Engineering from China University of Mining and Technology, Jiangsu, China, in 2015. She participates in two National Natural Science Foundations. Currently, she is a master candidate and is studying at the College of Civil Engineering, Tongji University in Shanghai, China. Her research focuses on the performance of the large diameter rock-socketed pile.

Chunfeng Li, born 1981, is a senior engineer and achieved a Master'degree in Geological Engineering from China University of Geosciences, Wuhan, China in 2010. He was awarded one invention patent and five utility model patents. Also, he is mainly engaged in geotechnical engineering survey & design as well as in the study of engineering applications of optical fiber sensing technology in Guizhou Transportation Planning Survey & Design Academe Co. Ltd., China.

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Published Online: 2017-06-19
Published in Print: 2017-06-01

© 2017, Carl Hanser Verlag, München

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  15. Performance monitoring of superlarge-diameter rock-socketed piles by optic fiber sensors
  16. Free vibration of a Timoshenko beam carrying three dimensional tip mass: Analytical solution and experimental modal testing
  17. Electrochemical properties of LaNi4.2Co0.4Zn0.1Al0.3 and LaNi4.3Co0.4Zn0.1Al0.2 alloys as anode materials for Ni-MH batteries
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https://doi.org/10.3139/120.111036

Articles in the same Issue

  1. Inhalt/Contents
  2. Contents
  3. Fachbeiträge/Technical Contributions
  4. The principles of measurement and testing to characterize material properties
  5. Electrochemical behavior of alloy AgCu50 during oxidation in the presence of chlorides and benzotriazole
  6. Mechanical property effects of symmetrical hour glass shapes formed during double-sided TIG keyhole arc welding of AISI1040 joints
  7. Residual stress state in pipe cut ring specimens for fracture toughness testing
  8. Effect of overlap length and scarf angle on the mechanical properties of different adhesive joints subjected to tensile loads
  9. Effect of post-weld heat treatment on fusion boundary microstructure in dissimilar metal welds for subsea service
  10. Effects of abaca fiber reinforcement on the dynamic mechanical behavior of vinyl ester composites
  11. Experimental and theoretical study of the rubbing process of epoxy composites against steel
  12. Structural self-organization of titanium alloys under impulse force action
  13. Effect of SiC particle size on the mechanical properties of closed aluminum foams
  14. Comparison of different bushing applications in composite structures of the aerospace industry
  15. Performance monitoring of superlarge-diameter rock-socketed piles by optic fiber sensors
  16. Free vibration of a Timoshenko beam carrying three dimensional tip mass: Analytical solution and experimental modal testing
  17. Electrochemical properties of LaNi4.2Co0.4Zn0.1Al0.3 and LaNi4.3Co0.4Zn0.1Al0.2 alloys as anode materials for Ni-MH batteries
  18. Production of hard hydrophilic Ni-B coatings on hydrophobic Ni-Ti and Ti-6Al-4V alloys by electroless deposition
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