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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Isolating shallow foundations from seismic loading
TL;DR: In this paper, the authors used the hysteric behavior of soil to isolate a shallow foundation from the underlying soil during an earthquake and compared the results with results when no special foundation layout was implemented and the impact of the proposed isolation methods is discussed.
Journal ArticleDOI
Accommodation of compression and lateral extension in a continental crust: Analogical modeling of the Central Atlas (eastern Algeria, Tunisia) and Pelagian sea
Rabeb Dhifaoui,Rabeb Dhifaoui,Pierre Strzerzynski,Régis Mourgues,Adel Rigane,Claude Gourmelen,David Peigné +6 more
TL;DR: In this article, analog modeling experiments of shortening and/or orthogonal extension applied to an upper-crust consisting of sand lying on weighted silicon are presented. And they highlight the role of processes at the scale of the lithosphere such as the formation of a crustal root below the Atlassic wedge and opposite vertical motions between Atlas and Pelagian areas as a consequence of delamination.
Proceedings ArticleDOI
Novel Experimental Technique for Visualizing and Analyzing Robot- Soil Interactions
TL;DR: The Shear Interface Imaging Analysis Tool as discussed by the authors enables analysis of robot-soil interactions in richer detail than possible before, and can do so even for high frequency changes in motion (several Hz).
Collapses of underground cavities and soil-structure interactions: influences of the position of the structure relative to the cavity
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Effects of solid fraction of saturated granular flows on overflow and landing mechanisms of rigid barriers
TL;DR: In this article , the authors used a 5m-long flume to model the impact of flows with different solid fraction νs on a rigid barrier, and the barrier height was varied to obtain barrier Froude numbers Frb (ratio of flow inertia to potential energy related to barrier height).
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.