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
Tunnel-Pile Interaction Analysis Using Cavity Expansion Methods
TL;DR: In this paper, an analytical method for estimating the effect of tunnel construction on end-bearing piles located above the tunnel is presented, which can be used to estimate the safe relative distance between existing piles and newly constructed tunnels.
Journal ArticleDOI
Centrifuge modeling of geotextile-reinforced slopes subjected to differential settlements
B. V. S. Viswanadham,D. König +1 more
TL;DR: In this paper, the response of geotextile-reinforced slopes subjected to differential settlements in a geotechnical centrifuge was addressed. But, the results of the centrifuge test indicate that even after inducing a differential settlement equivalent to 1.0 m in prototype dimensions, the structure with a flexible facing was not found to experience a collapse failure.
Journal ArticleDOI
Modeling wheel-induced rutting in soils: Indentation
TL;DR: In this article, the analysis of wheel indentation into frictional/cohesive soils is presented, where three-dimensional numerical simulations were performed using the finite element code ABAQUS to assess the influence of soil strength parameters, dilatancy and wheel geometry on the relationship between the indentation force and wheel sinkage.
Journal ArticleDOI
Numerical analyses of fault-foundation interaction
Ioannis Anastasopoulos,A. Callerio,Mark Fraser Bransby,Michael C. R. Davies,A. El Nahas,Ezio Faccioli,George Gazetas,A. Masella,Roberto Paolucci,Alain Pecker,E. Rossignol +10 more
TL;DR: In this paper, three different finite element (FE) methods were developed to simulate dip slip fault rupture propagation through soil and its interaction with foundation-structure systems, and the results of the parametric study reveal that the increase of the surcharge load q of the structure leads to larger fault rupture diversion and smoothing of the settlement profile, allowing reduction of its stressing.
Journal ArticleDOI
A Drying Cake Method for Measuring Suction-Stress Characteristic Curve, Soil–Water-Retention Curve, and Hydraulic Conductivity Function
Ning Lu,Murat Kaya +1 more
TL;DR: In this paper, a drying cake (DC) method was proposed to measure the suction-stress characteristic curve (SSCC), the soil-water-retention curve (SWRC), and the hydraulic conductivity function (HCF) of soils under drying conditions.
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.