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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Journal ArticleDOI
Investigation on the Working Mechanism and Structural Parameters Optimization of Multiple Ball Shaped Nodular Anchors
Chen Chen,Yuanyou Xia,Qing Ni +2 more
TL;DR: In this article, the authors performed a series of small-scale physical modeling tests on two types of multiple ball-shaped nodular underreamed anchors under vertical uplift loading conditions using transparent soil and particle image velocimetry.
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Determination of failure zone of vane shear test using artificial transparent soil
TL;DR: In this article, a small scale physical model was developed to study the failure mechanism during the vane shear test, which was used extensively in a variety of geotechnical exploration to determine the undrained shear strength fine grained clays and silts.
Journal ArticleDOI
Single-camera system for measuring paper deformations based on image analysis
TL;DR: In this paper , a technique for measuring paper deformation in unidirectional tensile tests, based on recording and analysis of a series of specimen images, is presented, which differs from the DIC-based deformation measurement in that the crosscorrelation of image data has been replaced with linear filtering.
Dissertation
New tools for modelling soil-filled masonry arch bridges
TL;DR: In this paper, the authors used the Box2D rigid body physics engine for modeling soil-filled masonry arch bridges and demonstrated that the macro-scale properties of a virtual soil material, modelled as an assembly of randomly shaped polygons, are independent of the simulated scenario.
Journal ArticleDOI
Temperature effect on the axial behaviour of a pipeline buried in soft clay
TL;DR: In this paper , a temperature-controlled experimental setup was developed for simulating the axial interaction between clayey seabed and pipelines, which were heated to two typical temperatures (i.e., 15 and 55 °C) under the drained condition and then axially loaded under the undrained condition till failure.
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.