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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Exploiting Image Assisted Total Station in Digital Image Correlation (DIC) displacement measurements: insights from laboratory experiments
TL;DR: In this article , an experimental campaign was carried out in the Institute of Engineering Geodesy and Measurement Systems Laboratory at Graz University of Technology (Austria), where pictures of a predetermined moving target, acquired from the IATS onboard optical camera (focal length of 231 mm), have been processed through Digital Image Correlation (DIC) to get displacements measures.
Centrifuge modelling to investigate soil-structure interaction mechanisms resulting from tunnel construction beneath buried pipelines.
Alec M. Marshall,Robert J. Mair +1 more
Journal ArticleDOI
Measuring strains on geogrid specimens under the laboratory tensile test
TL;DR: In this article, a wide-width tensile test was conducted on composite geogrid test specimens while calculating/measuring its tensile strain by three methods, namely, using GeoPIV-RG analysis, strain gauges attached to the specimens, and crosshead movements of Instron apparatus.
Journal ArticleDOI
Effect of particle roundness and morphology on the shear failure mechanism of granular soil under strip footing
TL;DR: In this article, the effect of particle roundness and morphology on the soil deformation was investigated under laboratory conditions, and the results showed that increasing the sample sizes increased the affected area of the soil at the same time, increasing relative density caused a punching failure mechanism that went towards the general failure.
Journal ArticleDOI
Novel surface speckle preparation method for imaging techniques for clay models
Marius Ottolini,Jelke Dijkstra +1 more
TL;DR: In this article, a novel method for the application of contrasting speckle material on a clay sample was developed, which minimises the sample disturbance resulting from sample handling and the removal of any transparent windows of the strongbox after the consolidation stage.
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.