A Vibration-Based System for Cavity-Underneath Identification of Concrete Pavement

Distributed optical vibration sensing-system (DOVS) can provide a long-distance vibration detection on pavement and a measurement of frequencies in regions of pavement slab, which is helpful for locating cavity beneath slab. In this paper, a DOVS-based cavity identification system is established to identify cavity in terms of its location and extent. Firstly, circling optical fiber that was installed into regions of slab constitutes a DOVS-based cavity identification system to measure regional frequencies under impact loading. Then the performance of the system in vibration sensing is evaluated by accelerometers. Secondly, a data processing method, including denoising, reconstruction and spectral analysis, is proposed to extract the features in regional frequency spectra. Then max spectrum proportion (MSP) that was determined from the regional frequency spectra is proposed to locate cavity and measure its extent. With the proposed MSP, the effect of cavity extent and location on regional frequency spectra is studied in full-scale tests. Finally, a field test is conducted to demonstrate the practicality of this system. Two conventional methods, “intercept method” and “deflection-ratio method”, are introduced for comparison of identification results. The comparison result indicates that this system is proved to be reliable in cavity identification.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFD20 Standing Committee on Pavement Condition Evaluation.
• Authors:
  • Zhao, Hongduo
  • Zeng, Mengyuan
  • Wu, Difei
  • Zhong, Sheng
• Conference:
  • Transportation Research Board 97th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2018-1-7 to 2018-1-11
• Date: 2018

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 15p

Subject/Index Terms

• TRT Terms: Concrete pavements; Detection and identification; Dimensional analysis; Frequency spectra
• Uncontrolled Terms: Distributed optical vibration sensing; Underground cavities
• Subject Areas: Highways; Pavements;

Filing Info

• Accession Number: 01658397
• Record Type: Publication
• Report/Paper Numbers: 18-00757
• Files: TRIS, TRB, ATRI
• Created Date: Jan 29 2018 5:53PM