Journal ArticleDOI
Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry
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A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing as mentioned in this paper.Abstract:
A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing. In this paper, the theory underlying this system is described, and the performance is validated. Digital photography is used to capture images of planar soil deformation. Using PIV, the movement of a fine mesh of soil patches is measured to a high precision. Since PIV operates on the image texture, intrusive target markers need not be installed in the observed soil. The resulting displacement vectors are converted from image space to object space using a photogrammetric transformation. A series of validation experiments are reported. These demonstrate that the precision, accuracy and resolution of the system are an order of magnitude higher than previous image-based deformation methods, and are comparable to local instrumentation used in element testing. This performance is achieved concurrent with an order of magnitude increase in the number of meas...read more
Citations
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Comparing the performance of helical anchors and direct-embedded plate anchors in cohesionless soil for top-down retaining walls stabilization: an experimental study
TL;DR: In this paper, the performance of two common types of mechanical anchors, namely the helical anchor and direct-embedded plate anchors, is analyzed in the stabilization of retaining walls using physical modeling.
Journal ArticleDOI
Estimating crack widths in steel fibre-reinforced concrete
TL;DR: In this paper, the authors applied particle image velocimetry (PIV) to the study of cracking in plain concrete and SFRC four-point flexural beam tests, and found that strain hardening under bending was observed, as was the propagation of multiple cracks in SFRC beams, in contrast to the brittle failure of the plain concrete specimen.
Feasibility study of random fibre reinforced railway ballast
TL;DR: In this paper, the authors present data based on image-based deformation measurements and macro-observations of fibre reinforced scaled ballast showing that fibres influence the micro-mechanical interactions governing volume change of the mixture rather than shear strength mobilization, which is enhanced by the tensile capability of the fibres in the mixture.
Journal ArticleDOI
Application of Particle Image Velocimetry in Establishing the Field of Zero Extension Lines in Soils
TL;DR: In this article, the authors demonstrate how a recently developed technique of particle image velocimetry can be used in constructing the field of zero extension lines (ZELs) in soils.
References
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Journal ArticleDOI
Particle-Imaging Techniques for Experimental Fluid Mechanics
TL;DR: A review of these methods can be found in articles by Lauterborn & Vogel (1984), Adrian (1986a), Hesselink (1988), and Dudderar et al..
Proceedings ArticleDOI
A four-step camera calibration procedure with implicit image correction
Janne Heikkilä,Olli Silven +1 more
TL;DR: This paper presents a four-step calibration procedure that is an extension to the two-step method, and a linear method for solving the parameters of the inverse model is presented.
Proceedings ArticleDOI
Calibration procedure for short focal length off-the-shelf CCD cameras
Janne Heikkilä,Olli Silven +1 more
TL;DR: A camera calibration procedure intended for a 3D measurement application is presented, paying attention to the various error sources, and notices that a more complete camera model is needed to explain all the error components.
Journal ArticleDOI
A review of instrumentation for measuring small strains during triaxial testing of soil specimens
TL;DR: In this article, the authors present a survey of small-strain measuring devices and their modes of operation, benefits, capabilities, and limitations, as well as a classification of internal and external measuring devices.