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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Fracture mode analysis and related surface deformation during dyke intrusion: Results from 2D experimental modelling
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Distributed fibre optic sensing of strains on buried full-scale PVC pipelines crossing a normal fault
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Crack initiation in clay observed in beam bending
TL;DR: In this paper, the authors investigated the stress-strain criteria for cracking in clays by performing four-point bending tests on consolidated kaolin clay beams, and they showed that the threshold tensile strain to cracking in kaolin is low.
Book ChapterDOI
Laboratory Modelling of Volcano Plumbing Systems: A Review
TL;DR: In this article, the authors review the numerous experimental studies dedicated to unravelling the physics and dynamics of various parts of a volcanic plumbing system and provide a step-by-step explanation of how to apply dimensional analysis to laboratory models in order to identify fundamental physical laws that govern the modelled processes in dimensionless (i.e., scale independent) form.
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Past, Present, and Future of Transparent Soils
TL;DR: Transparent soils have evolved in the past two decades as a useful tool for the physical modeling of soil-structure interaction mechanisms, saturated-unsaturated hydraulic behavior, and thermal processes in soils as discussed by the authors.
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.