Validation and implementation of a new method for monitoring in situ strain and temperature in rock masses using fiber-optically instrumented rock strain and temperature strips

Gage, J.; Fratta, Dante; Turner, A.; MacLaughlin, Mary; Wang, Herbert F.

doi:10.1016/j.ijrmms.2013.03.007

Cited by 27 publications

(16 citation statements)

References 14 publications

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“…Geoscience Optical Optical fiber 2000L, 4100L, [32,33,34,35], Extensometers and applications, 4850L [36] Tiltmeters (GEOX TM ) tiltmeters USGS Hydrogravity Local gravity for water Surface, 300L, [37] tables, densities 4100L, 4850L Petrology, Ore Deposits, Core archive and logs, Surface, 800L [38,39,40] Structure (PODS) geologic mapping Transparent Earth Seismic monitoring/ 2000L, 4100L [41,42,43] properties, melt studies 4850L…”

Section: Geologymentioning

confidence: 99%

The Sanford Underground Research Facility at Homestake

Heise¹

2015

J. Phys.: Conf. Ser.

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Section: Geologymentioning

confidence: 99%

The Sanford Underground Research Facility at Homestake

Heise¹

2015

J. Phys.: Conf. Ser.

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“…Existing packaging methods include gluing FBG to the target and embedding with adhesives [22,23,24,25,26], packaging FBG in pipes or on plates [25,27,28,29,30], or encapsulating FBG into composites or layered structures [20,31,32,33,34]. For field geohazard monitoring, the installation works can be extremely tricky since the optical fibers can hardly be adhered on geomaterials.…”

Section: Development Of Fbg-based Geohazard Monitoring Systemsmentioning

confidence: 99%

FBG-Based Monitoring of Geohazards: Current Status and Trends

Zhu

Shi

Zhang

2017

Sensors

125

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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.

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“…In the structural stability monitoring of the underground cavern group, a number of advanced measuring techniques have been utilized, such as electrical resistance strain gauges [ 7 ], Linear Variable Differential Transformers (LVDT) [ 8 ], mini multi-point extensometers [ 9 ], digital speckle photography deformation measurement (DSPD) [ 10 ], Fiber Bragg Grating (FBG) sensors [ 11 , 12 , 13 ], and others. For strain gauges bonding to the specimen for structural health monitoring, the resistive type strain gauges are always sensitive to temperature variation; therefore, it becomes necessary to account for variations in strain gauge resistance due to temperature changes.…”

Section: Introductionmentioning

confidence: 99%

Structural Stability Monitoring of a Physical Model Test on an Underground Cavern Group during Deep Excavations Using FBG Sensors

Wang

Zhu

et al. 2015

Sensors

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Fiber Bragg Grating (FBG) sensors are comprehensively recognized as a structural stability monitoring device for all kinds of geo-materials by either embedding into or bonding onto the structural entities. The physical model in geotechnical engineering, which could accurately simulate the construction processes and the effects on the stability of underground caverns on the basis of satisfying the similarity principles, is an actual physical entity. Using a physical model test of underground caverns in Shuangjiangkou Hydropower Station, FBG sensors were used to determine how to model the small displacements of some key monitoring points in the large-scale physical model during excavation. In the process of building the test specimen, it is most successful to embed FBG sensors in the physical model through making an opening and adding some quick-set silicon. The experimental results show that the FBG sensor has higher measuring accuracy than other conventional sensors like electrical resistance strain gages and extensometers. The experimental results are also in good agreement with the numerical simulation results. In conclusion, FBG sensors could effectively measure small displacements of monitoring points in the whole process of the physical model test. The experimental results reveal the deformation and failure characteristics of the surrounding rock mass and make some guidance for the in situ engineering construction.

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Validation and implementation of a new method for monitoring in situ strain and temperature in rock masses using fiber-optically instrumented rock strain and temperature strips

Cited by 27 publications

References 14 publications

The Sanford Underground Research Facility at Homestake

The Sanford Underground Research Facility at Homestake

FBG-Based Monitoring of Geohazards: Current Status and Trends

Structural Stability Monitoring of a Physical Model Test on an Underground Cavern Group during Deep Excavations Using FBG Sensors

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