Monitoring of Deformation Behaviour of Unsaturated Soil Slope using Distributed Optical Fibre Sensor

Dayangku Salma, Awang Ismail and Azman, Kassim (2020) Monitoring of Deformation Behaviour of Unsaturated Soil Slope using Distributed Optical Fibre Sensor. INTERNATIONAL JOURNAL OF INTEGRATED ENGINEERING, 12 (9). pp. 199-207. ISSN 2600-7916

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Abstract

A distributed optical fibre sensing system named Brillouin Optical Time Domain Analysis (BOTDA) is used to monitor the strain development of a laboratory soil slope model. The technology is yet to be fully implemented due to uncertainties of attachment method or the best way to set up optical fibre sensors for geo-structure health monitoring. The aim of study is to evaluate the deformation behaviour subjected to the development of horizontal strains from Brillouin-based optical fibre sensor of a residual soil slope under loading impact using BOTDA technology. In this study, a soil-embedded strain sensor placement approach was proposed to be installed in the 1g model of soil slope which was achieved via the horizontal planting of a three-layered optical fibre cable in S-curve forming slope. In this paper, however, only pilot tests result is demonstrated for preliminary data interpretation purposes. From the preliminary laboratory tests, the results show the soil-embedded sensing fibre arrangement has efficiently detected and measured the horizontal strain deformation due to loading. Therefore, it can be concluded that the sensing fibre was well-responded with the soil movement under loading impact.

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