Fiber optic monitoring of an underground excavation model text

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

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6 Citations (Scopus)

Abstract

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 languageEnglish
Pages (from-to)826-830
Number of pages5
JournalZhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology
Volume39
Issue number6
Publication statusPublished - Nov 2010
Externally publishedYes

Keywords

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

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