Experimental Study on Distributed Optical Fiber Sensor Based on BOTDR in the Model Tests of Expansive Soil Slope Protected by HPTRM
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.
This research was supported by National Natural Science Foundation of China (NSFC) (No. 51369006).
- Cliftion, D.H.: Full-scale testing of three innovative levee strengthening systems under overtopping condition. Master thesis, Jackson State University (2010)Google Scholar
- Kang, C.Y.: Experimental study of erosion on expansive soil slope strengthened by High Performance Turf Reinforcement Mat (HPTRM) system in Nanning. Master thesis, Guangxi University (2015)Google Scholar
- Xian, S.H.: Research on the protective effect of anchored reinforced vegetation system on expansive soil slope surface. Master thesis, Guangxi University (2016)Google Scholar
- Li, H.Q., Sun, H.Y., Liu, Y.L., et al.: Application of optical fiber sensing technology to slope model test. Chin. J. Rock Mechan. Eng. (2008). https://doi.org/10.3321/j.issn:1000-6915.2008.08.022CrossRefGoogle Scholar
- Wang, B.J., Li, K., Shi, B., et al.: Simulation experiment for distributed fiber monitoring on deformation of soil slope. Chin. J. Rock Mechan. Eng. (2009). https://doi.org/10.3969/j.issn.1004-9665.2010.03.006CrossRefGoogle Scholar
- Zhu, H.H., Yin, J.H., Hong, C.Y., et al.: Fiber optic based monitoring technologies of slope engineering. Geotech. Investig. Surv. 3, 6–10 (2010)Google Scholar
- Fan, G.: Experimental study on protective effect of ARVS system on expansive soil slope. Master thesis, Guangxi University (2016)Google Scholar