Schenato Luca, Palmieri Luca, Camporese Matteo, Bersan Silvia, Cola Simonetta, Pasuto Alessandro, Galtarossa Andrea, Salandin Paolo, Simonini Paolo
National Research Council, Research Institute for Geo-Hydrological Protection, Padova, 35127, Italy.
University of Padova, Dept. of Information Engineering, Padova, 35131, Italy.
Sci Rep. 2017 Oct 31;7(1):14686. doi: 10.1038/s41598-017-12610-1.
A distributed optical fibre sensing system is used to measure landslide-induced strains on an optical fibre buried in a large scale physical model of a slope. The fibre sensing cable is deployed at the predefined failure surface and interrogated by means of optical frequency domain reflectometry. The strain evolution is measured with centimetre spatial resolution until the occurrence of the slope failure. Standard legacy sensors measuring soil moisture and pore water pressure are installed at different depths and positions along the slope for comparison and validation. The evolution of the strain field is related to landslide dynamics with unprecedented resolution and insight. In fact, the results of the experiment clearly identify several phases within the evolution of the landslide and show that optical fibres can detect precursory signs of failure well before the collapse, paving the way for the development of more effective early warning systems.
分布式光纤传感系统用于测量埋设在大型边坡物理模型中的光纤上由滑坡引起的应变。光纤传感电缆部署在预定义的破坏面上，并通过光频域反射法进行检测。以厘米级的空间分辨率测量应变演化，直至边坡发生破坏。在边坡不同深度和位置安装了测量土壤湿度和孔隙水压力的传统标准传感器，用于比较和验证。应变场的演化以前所未有的分辨率和洞察力与滑坡动力学相关。事实上，实验结果清楚地识别出了滑坡演化过程中的几个阶段，并表明光纤能够在崩塌发生前很久就检测到破坏的前兆迹象，为开发更有效的早期预警系统铺平了道路。
