Journal ArticleDOI
Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry
Reads0
Chats0
TLDR
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
More filters
Journal ArticleDOI
Differential strain transfer, Longmen Shan thrust belt, eastern Tibetan Plateau margin: Implications for seismic hazards
Chongjian Shao,Chongjian Shao,Yong Li,Zhaokun Yan,Shao Liu,Rongjun Zhou,Jingbo Li,Shunli Dong,Liang Yan,Tao Deng,Zhou Nie +10 more
TL;DR: Wang et al. as discussed by the authors combine structural profile re-analysis, sandbox modeling and seismic statistics to illustrate the strain transfer process in the middle-southern Longmen Shan (LMS) thrust belt.
Journal ArticleDOI
DEM analyses of shear band in granular materials
Mingjing Jiang,Wangcheng Zhang +1 more
TL;DR: In this paper, the authors carried out several two-dimensional distinct element method simulations to examine various global and local micromechanical quantities particular the energy dissipation and local stress and strain invariants with a special emphasis on the initiation and propagation of shear bands.
Journal ArticleDOI
A Review of the Sand Castle Test for Assessing Collapsibility of Filters in Dams
Abbas Soroush,Piltan Tabatabaie Shourijeh,Hamed Farshbaf Aghajani,Alireza Mohammadinia,Amir-Hossien Aminzadeh +4 more
TL;DR: The Sand Castle (SC) test is a simple test for recognition of collapsibility and self-healing in filter materials as mentioned in this paper, and it is used to evaluate the ability of filters to hold a crack.
Journal ArticleDOI
Model test assessment of the generation of underground cavities and ground cave-ins by damaged sewer pipes
TL;DR: In this paper, the authors conducted model experiments to determine how damaged sewer pipes generate ground cave-ins or cavities, with a focus on the influence of the soil type and density.
Journal ArticleDOI
Strain measurement and determining coefficient of plastic anisotropy using digital image correlation (DIC)
TL;DR: This technique compares the digital images taken from digital cameras, before and after deformation, and calculated the coefficient of plastic anisotropy, which shows that if the test’s setup could be configured in a good way, the error will be less than 2%.
References
More filters
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.