Research of distributed fiber optic sensing technology in monitoring of Majiagou landslide of Three Gorges

摘要

Distributed fiber optic sensing (DFOS) technology is used to monitor deformation of landslide, overcoming defects of conventional sensors.A brief introduction of several DFOS technologies and their principles is made.The authors emphatically introduce the laying means of optical fiber in the Majiagou landslide of Three Gorges.Based on characteristics of engineering environment, fiber is implanted into the anti-sliding piles and the soil below two gutters which are along the contour line of the slope.Besides, a few boreholes are made which is used for installing inclinometer sensors.The sensing fiber is pasted on the outer wall of inclinometer tube to measure its deformation and a series of FBGs are installed in the hole at the same time.The monitoring results show that: The proposed distributed optical fiber sensing technology can accurately identify the location of the fiber with abnormal deformation.