Fiber optic monitoring of an underground excavation model text

Hong Hu Zhu, Wei Shen Zhu, Jianhua Yin, Qian Bing Zhang, Hua Fu Pei, Wei Jin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


An innovative bar-type fiber optic displacement sensor based on fiber Bragg grating (FBG) technique was developed to overcome difficulties of conventional methods used to monitor internal displacement fields within a small-scale geomechanical model. An FBG array sensors was attached to a plastic bar and laboratory calibration of the apparatus was performed. Three sensors were installed into a three-dimensional model simulating the underground excavation of the Shuangjiangkou hydro-power station. The sensors were installed with a pre-grout method. Calibration and model tests show that the displacement sensor accurately measures displacement profiles along the bar length. The strain data from the FBG sensors provides the information used to derive the displacement profile. Horizontal displacements during excavations near the main power house and the surge chamber are within a small range and the excavation activities are demonstrated not to affect the overall stability of the structure.
Original languageChinese (Simplified)
Pages (from-to)826-830
Number of pages5
JournalZhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology
Issue number6
Publication statusPublished - 1 Nov 2010


  • FBG
  • Fiber optic displacement sensor
  • Geomechanical model test
  • Underground excavation

ASJC Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology
  • Civil and Structural Engineering
  • Mechanical Engineering

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