Distributive monitoring of the slope engineering

Shu, Bin; Sui, Haibo; Zhang, Dan; Wei, Guangqing; Piao, Chunde

doi:10.1201/9780203885284-c171

Cited by 9 publications

(5 citation statements)

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“…These technologies enable simultaneous measurement of strain and temperature distributions along an optical fiber up to several kilometers, which is very attractive for geotechnical monitoring [9][10][11]. Recently they have been successfully applied to performance monitoring of a variety of geotechnical-related structures, including natural and man-made slopes [2,3,[12][13][14][15][16], deep and shallow foundations [17][18][19], embankments and dams [20][21][22], and tunnels and excavations [23][24][25][26][27]. These applications have demonstrated the exceptional features of distributed fiber-optic sensing technologies, such as long-distance measurement, high repeatability, and superior corrosion resistance.…”

Section: Introductionmentioning

confidence: 99%

Interfacial characterization of soil-embedded optical fiber for ground deformation measurement

Zhang

Zhu

Shi

et al. 2014

Smart Mater. Struct.

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Recently fiber-optic sensing technologies have been applied for performance monitoring of geotechnical structures such as slopes, foundations, and retaining walls. However, the validity of measured data from soil-embedded optical fibers is strongly influenced by the properties of the interface between the sensing fiber and the soil mass. This paper presents a study of the interfacial properties of an optical fiber embedded in soil with an emphasis on the effect of overburden pressure. Laboratory pullout tests were conducted to investigate the load-deformation characteristics of a 0.9 mm tight-buffered optical fiber embedded in soil. Based on a tri-linear interfacial shear stress-displacement relationship, an analytical model was derived to describe the progressive pullout behavior of an optical fiber from soil matrix. A comparison between the experimental and predicted results verified the effectiveness of the proposed pullout model. The test results are further interpreted and discussed. It is found that the interfacial bond between an optical fiber and soil is prominently enhanced under high overburden pressures. The apparent coefficients of friction of the optical fiber/soil interface decrease as the overburden pressure increases, due to the restrained soil dilation around the optical fiber. Furthermore, to facilitate the analysis of strain measurement, three working states of a soil-embedded sensing fiber were defined in terms of two characteristic displacements.

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Section: Introductionmentioning

confidence: 99%

Interfacial characterization of soil-embedded optical fiber for ground deformation measurement

Zhang

Zhu

Shi

et al. 2014

Smart Mater. Struct.

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“…Another approach, enabled by the long range capability of the DFOSs, consists in installing the fiber in loop configuration through an array of soil nails, inclinometers tubes, and frame beams, such as in Shi et al [2008]. A similar deployment was also proposed by Hoepffner et al [2008], at the Aggenalm landslide (Bavarian Alps) where a Brillouin interrogator (along with a Raman interrogator for temperature compensation) was used to probe a 90 m long sensing cable, partly embedded in the soil and partly inside an inclinometer borehole in a loop configuration.…”

Section: Distributed Strain Sensingmentioning

confidence: 99%

Distributed fiber optics strain sensors: from long to short distance

Blanc¹,

Schenato²,

Molardi³

et al. 2022

Comptes Rendus. Géoscience

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Developed for more than forty years, optical fibers have features that make them particularly attractive for making sensors. One of the strengths of these sensors is that they can measure different physical parameters in a distributed manner over a wide range of lengths (from a few cm up to tens of kilometers) with a spatial resolution ranging from millimeters to meters. In this article, we are particularly interested in distributed fiber sensors, mainly based on light scattering processes, for measuring strain variations. This review concerns both applications requiring long lengths of fiber in a geological context, as well as those using length less than one meter for the medical sector. While distributed fiber optics sensors have already shown their great potential for long-range applications, short-range applications are a niche sector emerging in the last few years.Résumé. Développées depuis plus de quarante ans, les fibres optiques présentent des caractéristiques qui les rendent particulièrement attractives pour la réalisation de capteurs. L'un des points forts de ces capteurs est qu'ils peuvent mesurer différents paramètres physiques de manière distribuée sur une large gamme de longueurs (de quelques cm à des dizaines de kilomètres) avec une résolution spatiale allant du millimètre au mètre. Dans cet article, nous nous intéressons particulièrement aux capteurs

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“…The deflectometer is composed of several interconnected rods which have, at their ends, electronic heads which measure deflection between two rods in the x and y direction. Optical fibres can be efficiently used to measure deformations in soil [33,34]. These fibres can be installed along the entire area of the landslide, and hence continuous data can be obtained for each point along the landslide.…”

Section: Geotechnical Observation Of Displacementsmentioning

confidence: 99%

Risk identification in landslide monitoring

Mihalinec

Bačić

Kovačević

2013

JCE

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Risk identification in landslide monitoring Landslide monitoring has an important role in the understanding of the landslide process, which is especially important in urban areas where landslide activation may directly or indirectly endanger human lives and cause material damage. Potential risk sources in landslide monitoring are identified in the paper, and terms the measurement purpose, measured parameters, measuring equipment, and measurement results, are explained. The role of landslide monitoring in urban areas is presented using as an example a well documented landslide Grmoščica in Zagreb.

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Distributive monitoring of the slope engineering

Cited by 9 publications

References 0 publications

Interfacial characterization of soil-embedded optical fiber for ground deformation measurement

Interfacial characterization of soil-embedded optical fiber for ground deformation measurement

Distributed fiber optics strain sensors: from long to short distance

Risk identification in landslide monitoring

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