Brillouin optical time-domain analysis for geotechnical monitoring

Zeni, Luigi; Picarelli, Luciano; Avolio, B.; Coscetta, Agnese; Papa, Raffaele; Zeni, Giovanni; Maio, Caterina Di; Vassallo, Roberto; Minardo, Aldo

doi:10.1016/j.jrmge.2015.01.008

Cited by 87 publications

(43 citation statements)

References 2 publications

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“…This has a great deal of potential for geotechnical monitoring. A number of soil structures have been successfully monitored by DGM systems, such as slopes [2][3][4][5][6][7][8][9][10][11], foundations [12][13][14][15], and tunnels [16][17][18]. These systems have gained interest from researchers and engineers worldwide by their inherent advantages, including immunity to electromagnetic interference (EMI), high repeatability and durability, tiny size and light weigh, and the ability to multiplex many sensors on one single fiber.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on pullout performance of sensing optical fibers in compacted sand

et al. 2015

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Section: Introductionmentioning

confidence: 99%

Experimental study on pullout performance of sensing optical fibers in compacted sand

et al. 2015

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“…Installation of thousands of strain gauges along a single cable into the required earthwork structure can provide present situation of the ground which is highly informative [13]. Numerous researchers have practiced the usage of fiber optic strain sensors in the field of geotechnical engineering [14][15][16][17][18]. It has been identified that the Brillouin optical time-domain reflectometry (BOTDR) method is highly durable and a powerful fiber optic sensor which measures not only for health diagnosis but also in various engineering sectors for long distance and measures accurately with real-time data based system [19][20][21][22][23][24][25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Observation of Static Load of L-Shaped Retaining Wall Constructed on Short Wooden Pile Using Fiber Optic Geogrid BOTDR Method

Manandhar

Miyazoe²,

Fukuoka³

et al. 2016

Indian Geotech J

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The scope of the study was aimed to observe the long-term static load of the L-shaped retaining walls incorporated with fiber optic geogrid using Brillouin optical time-domain reflectometry method at the interval of 55 mm installed with short wooden pile of small diameter. The application of wooden pile in soft ground using the bottom panel system structure of the foundation has been discussed based on the published construction manual referred to the waterway box culvert and pre-cast L-shaped retaining walls to reduce the load on the short wooden pile head using geogrid. The actual vehicle dump truck was used to measure loads passing through the retaining wall after 160 days of construction. The results showed that the load acting on the pile increases with time and approached the allowable bearing capacity of 28.9 kN/pile group. The straining immediate after the construction was detected to be decreased after four months due to stress relaxation on the geogrid. The strain under static live load under a rear wheel of the dump truck to a virtual rear portion of L-shaped retaining wall and at the central portion of the bottom panel width of L-shaped retaining wall yielded the tensile straining in the periphery. It is found that the straining on geogrid is relatively small to be able for bearing the load of the dump truck to some extent.

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“…However, these conventional inclinometers have a number of disadvantages in practical applications, including low stability and durability, poor resistance to electromagnetic interference, high gravity dependence, and great signal loss for long-distance transmission. Recently, the fiber optic sensing technologies have been advocated for slope monitoring by some scholars [1][2][3][4][5][6][7][8]. Different types of FBG-based in-place inclinometers have been developed, which demonstrated various features, such as small size, superior chemical resistance and stability, immune to electro-magnetic interference, and quasi-distributed monitoring capability [9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Introduction to an FBG-based inclinometer and its application to landslide monitoring

Wang

Shi

Zhang

et al. 2015

J Civil Struct Health Monit

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This paper presents a self-designed in-place inclinometer based on fiber Bragg grating (FBG) technology and introduces its application to a landslide monitoring project in Wenzhou, China. The working principle of the FBG-based inclinometer is briefly introduced. The FBG-based inclinometers were installed into nine boreholes that were distributed over different areas of the landslide. After 4 months of monitoring, the deformation of the soil mass at different depths above the bedrock within the landslide was captured by the inclinometers. The results indicated that the soil deformation above the bedrock was relatively large whereas that below the bedrock was minor. Based on the field monitoring data, the potential sliding zones were predicted to be the areas near the bedrock. In addition, a limit equilibrium analysis was carried out to evaluate the stability of the landslide under the circumstance of rainfall. The analyses showed that the calculated failure surface was consistent with the field observations, indicating that the monitoring data recorded by FBGs were accurate. These findings demonstrate that a combination of FBG technique and limit equilibrium analysis can be used to evaluate the stability of landslides effectively.

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Brillouin optical time-domain analysis for geotechnical monitoring

Cited by 87 publications

References 2 publications

Experimental study on pullout performance of sensing optical fibers in compacted sand

Experimental study on pullout performance of sensing optical fibers in compacted sand

Observation of Static Load of L-Shaped Retaining Wall Constructed on Short Wooden Pile Using Fiber Optic Geogrid BOTDR Method

Introduction to an FBG-based inclinometer and its application to landslide monitoring

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