Abstract
Brilliouin optical time domain reflectometer (BOTDR) is a testing technology and monitoring technique, which utilizes Brilliouin spectroscopy and optical time domain reflectometer to obtain axial strains along the distributed optical fibers. Strains can be transformed into longitudinal deformations through simple calculations. The High-Performance Turf Reinforcement Mats (HPTRM) is a kind of three-dimensional geonet, which has good extensibility and tensile performance. As the flexible material, HPTRM is applicable for expansive soil slope protection. It is a fresh attempt to deformations observation of HPTRM that are used to protect expansive soil slope by distributed fiber optic technology. The objective of this paper is to study applicability of distributed optical fiber as deformation monitoring device for expansive soil slope. In the model test, optical fibers were fixed to HTPMR by adhesive agent, and expansive soil was covered with HPTRM closely. Expansive soil was constrained by HPTRM after absorbency swell, and the HPTRM and optical fibers was subject to distortion by soil expansion. Distributed optical fiber sensor was pasted on the HPTRM to test strains of its fibers, and vertical deformation of the soil can be obtained by simple calculations. The experimental results show that the results of calculation are in good agreement with the measurement of dial indicator. And the deformation of HPTRM in protected expansive soil slope is within the allowable range of HPTRM material. It is feasible to be used in the field of deformation surveillance of HPTRM to protect expansive soil slope.
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Acknowledgments
This research was supported by National Natural Science Foundation of China (NSFC) (No. 51369006).
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Xu, Y., Wei, F., Fan, G., Li, L. (2019). Experimental Study on Distributed Optical Fiber Sensor Based on BOTDR in the Model Tests of Expansive Soil Slope Protected by HPTRM. In: McCartney, J., Hoyos, L. (eds) Recent Advancements on Expansive Soils. GeoMEast 2018. Sustainable Civil Infrastructures. Springer, Cham. https://doi.org/10.1007/978-3-030-01914-3_13
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DOI: https://doi.org/10.1007/978-3-030-01914-3_13
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