[Geotechnical Engineering]

Yong Zheng, Zhengwei Zhu, Wanjie Li, Dongming Gu, Wang Xiao. Experimental research on a novel optic fiber sensor based on OTDR for landslide monitoring[J]. Measurement, 2019, 8: 106926.

Keywords: Optic fiber sensor (OFS); Optical time domain reflectometer (OTDR); Landslide monitoring; Field monitoring

High Lights:

A novel optic fiber sensor based on OTDR for landslide monitoring was presented.

The idea that the sensor allows displacements without damage the fiber was verified.

Field-monitoring test of the sensor on a shallow artificial slope was conducted.

Abstract:

In this paper a novel optic fiber sensor (OFS) based on optical time domain reflectometer (OTDR) with simple construction and innovative structure was developed for landslide monitoring. The instrument had a maximum measurement distance and an effective initial measurement displacement and a low economic cost of 36 mm, 0.98 mm and $ 0.45/m. A direct-shear experiment with an OFS was conducted to investigate its effectiveness in monitoring the damage from shear sliding on rock slopes. A detailed field-monitoring test of the proposed OFS on a shallow artificial slope was conducted and the progressive deformation behavior of the slope was accurately captured by the OFS. In addition, it is possible to connect these OFSs in series to explore the underground properties of deep-seated landslides. This capability supports the promising application of the OFS in civil engineering for real-time monitoring of the stability of slopes, foundation pits and dams.

Resource： https://www.sciencedirect.com/science/article/pii/S0263224119307833