Effectiveness of Fiber Bragg Grating monitoring in the centrifugal model test of soil slope under rainfall conditions Effectiveness of Fiber Bragg Grating monitoring in the centrifugal model test of soil slope under rainfall conditions

最小化 最大化

Vol14 No.5: 936-947

Title】Effectiveness of Fiber Bragg Grating monitoring in the centrifugal model test of soil slope under rainfall conditions

Author】LI Long-qi 1, 2*; JU Neng-pan 1, 2*; GUO Yong-xing 3

Addresses】1 State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu 610059, China; 2 College of Environment and Civil Engineering, Chengdu University of Technology, Chengdu 610059, China; 3 School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China

Corresponding author】jnp@cdut.edu.cn; 287820171@qq.com

Citation】Li LQ, Ju NP, Guo YX, et al. (2017) Effectiveness of Fiber Bragg Grating monitoring in the centrifugal model test of soil slope under rainfall conditions. Journal of Mountain Science 14(5). DOI: 10.1007/s11629-016-4163-4

DOI】10.1007/s11629-016-4163-4

Abstract】Centrifugal model tests are playing an increasingly important role in investigating slope characteristics under rainfall conditions. However, conventional electronic transducers usually fail during centrifugal model tests because of the impacts of limited test space, high centrifugal force, and presence of water, with the result that limited valid data is obtained. In this study, Fiber Bragg Grating (FBG) sensing technology is employed in the design and development of displacement gauge, an anchor force gauge and an anti-slide pile moment gauge for use on centrifugal model slopes with and without a retaining structure. The two model slopes were installed and monitored at a centrifugal acceleration of 100 g. The test results show that the sensors developed succeed in capturing the deformation and retaining structure mechanical response of the model slopes during and after rainfall. The deformation curve for the slope without retaining structure shows a steep response that turns gradual for the slope with retaining structure. Importantly, for the slope with the retaining structure, results suggest that more attention be paid to increase of anchor force and anti-slide pile moment during rainfall. This study verifies the effectiveness of FBG sensing technology in centrifuge research and presents a new and innovative method for slope model testing under rainfall conditions.

Keywords】Fiber Bragg Grating sensing technology; Centrifugal model test; Soil slope; Rainfall conditions; Slope displacement