FBG-Based Monitoring of Geohazards: Current Status and Trends

Abstract

In recent years, natural and anthropogenic geohazards have occured frequently all over the world, and field monitoring is becoming an increasingly important task to mitigate these risks. However, conventional geotechnical instrumentations for monitoring geohazards have a number of weaknesses, such as low accuracy, poor durability, and high sensitivity to environmental interferences. In this aspect, fiber Bragg grating (FBG), as a popular fiber optic sensing technology, has gained an explosive amount of attention. Based on this technology, quasi-distributed sensing systems have been established to perform real-time monitoring and early warning of landslides, debris flows, land subsidence, earth fissures and so on. In this paper, the recent research and development activities of applying FBG systems to monitor different types of geohazards, especially those triggered by human activities, are critically reviewed. The working principles of newly developed FBG sensors are briefly introduced, and their features are summarized. This is followed by a discussion of recent case studies and lessons learned, and some critical problems associated with field implementation of FBG-based monitoring systems. Finally the challenges and future trends in this research area are presented.

Review of Application and Innovation of Geotextiles in Geotechnical Engineering

“…Fiber optic sensor based on Fiber Bragg grating (FBG) is the first sensor applied to geotextiles [98][99][100]. The working principle and sensing principle of FBG are shown in Figure 13.…”

Geohazards Affecting Cultural Heritage Monuments. A Complex Case Study From Romania

“…Geohazards are a separate category of risk phenomena, being de ned as potentially harmful events for the population or the environment, directly related to the geological status and processes (Tomas and Li 2017;Wang et al 2019). Most often, geohazards have as the main cause of triggering the natural phenomena and processes, but in some cases these can also occur as a result of human modeling interventions on the natural component (Zhu et al 2017); thus, geohazards are individualized as geohazards of natural origin (landslides, earthquakes, tsunamis, volcanic eruptions, oods, rockfalls) and geohazard of anthropogenic origin (land subsidence, water contaminasion, extreme weather events due to atmosphere pollution etc. ).…”

Test and Study of Pipe Pile Penetration in Cohesive Soil Using FBG Sensing Technology

“…Due to the small size of the model pipe pile and the small pressure on the pile, the size and sensitivity of the sensor were required to increase, and electrical sensors could not meet the test requirements. Fiber Bragg grating sensors have been applied to the model test due to their strong anti-electromagnetic interference ability, small size, light weight, and remote measurement [25][26][27][28][29][30][31][32][33].…”