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
Shrinkage characteristics of heat-tacked GCL seams
TL;DR: In this paper, the behavior of heat-tacked GCL seams under cyclic wetting and drying was examined and it was shown that the transverse shrinkage behavior was similar to that observed in previous shrinkage tests performed on unseamed GCLs.
Journal ArticleDOI
Experimental analysis of progressive failure behavior of rock tunnel with a fault zone using non-contact DIC technique
Feng Huang,Chuangzhou Wu,Chuangzhou Wu,Pengpeng Ni,Guoqing Wan,Aichen Zheng,Bo-An Jang,Shivakumar Karekal +7 more
TL;DR: In this paper, the failure mechanism of a tunnel in the vicinity of a fault zone is investigated by physical model tests with dimensions of 3m × 2.4m × 0.4mm, in which the non-contact Digital Image Correlation (DIC) technique is employed to provide full-field displacement measurements.
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Thermal Expansion and Contraction of Geomembrane Liners Subjected to Solar Exposure and Backfilling
TL;DR: In this article, wrinkles are induced in a 15mm-thick, black high-density polyethylene strip overlying a geosynthetic clay liner using natural solar and laboratory energy sources.
DissertationDOI
An arbitrary Lagrangian-Eulerian method for penetration into sand at finite deformation
TL;DR: In this paper, an operator-split operator is used to break up the solution of the governing equations over a time step into a Lagrangian step, a mesh regularization step, and a transport step.
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.