An optical fibre monitoring system for evaluating the performance of a soil nailed slope

Hong Hu Zhu, Albert N.L. Ho, Jianhua Yin, H. W. Sun, Hua Fu Pei, Cheng Yu Hong

Research output: Journal article publicationJournal articleAcademic researchpeer-review

111 Citations (Scopus)


Conventional geotechnical instrumentation techniques available for monitoring of slopes, especially soil-nailed slopes have limitations such as electromagnetic interference, low accuracy, poor longterm reliability and difficulty in mounting a series of strain sensors on a soil nail bar with a small-diameter. This paper presents a slope monitoring system based on fibre Bragg grating (FBG) sensing technology. This monitoring system is designed to perform long-term monitoring of slope movements, strains along soil nails, and other slope reinforcement elements. All these FBG sensors are fabricated and calibrated in laboratory and a trial of this monitoring system has been successfully conducted on a roadside slope in Hong Kong. As part of the slope stability improvement works, soil nails and a toe support soldier-pile wall were constructed. During the slope works, more than 100 FBG sensors were installed on a soil nail, a soldier pile, and an in- place inclinometer. The paper presents the layout and arrangement of the instruments as well as the installation procedures adopted. Monitoring data have been collected since March 2008. This trial has demonstrated the great potential of the optical fibre monitoring system for long-term monitoring of slope performance. The advantages of the slope monitoring system and experience gained in the field implementation are also discussed in the paper.
Original languageEnglish
Pages (from-to)393-410
Number of pages18
JournalSmart Structures and Systems
Issue number5
Publication statusPublished - 1 Jan 2012


  • Fibre Bragg grating (FBG)
  • Geotechnical instrumentation
  • Optical fibre sensing
  • Slope monitoring system
  • Soil nailing

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Computer Science Applications
  • Electrical and Electronic Engineering


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