Dynamic three-dimensional displacement analysis of small-scale granular flows by fringe projection and digital image correlation
Por:
Barrientos, Bernardino, Mares, Carlos, Sarocchi, Damiano, Cerca, Mariano, Valdivia, Ricardo
Publicada:
1 abr 2020
Ahead of Print:
1 nov 2019
Categoría:
Geotechnical engineering and engineering geology
Resumen:
In this work, we present experimental results that show the feasibility
of measuring three-dimensional displacement in models of dry granular
avalanches. For this purpose, we have used a technique that is capable
to measure simultaneously the three involved mutually perpendicular
components of displacement on the free surface of the granular flow. The
approach comprises two simultaneously used optical techniques: fringe
projection, FP, and digital image correlation, DIC; the first technique
yields the out-of-plane component of displacement, and the second one,
the two in-plane components. Combination of both techniques is achieved
by color encoding, which consists in using different color illumination
sources for the two optical techniques, in conjunction with a camera
recording in RGB. The resulting combination is robust since the
illumination sources are non-coherent between them, avoiding any optical
interference. This contribution shows the potentiality of the method to
analyze dynamic events, by presenting temporal full-field sequences of
displacement of small-scale granular flows down an inclined plane, at
camera speeds up to 2000 fps. These types of measurements are valuable
for validation of physical and numerical models related with the
analysis of the dynamic behavior of granular flows in the earth. Because
these phenomena, which include rock avalanches, debris avalanches,
debris flows, and pyroclastic density currents, are among the most
dangerous natural hazards in mountainous and volcanic areas, the
possibility to foresee their behavior in a more precise way is extremely
important in order to elaborate more rigorous physical models and
improve the predictive capacity of the simulation software.
Filiaciones:
Barrientos, Bernardino:
Centro de Investigaciones en Óptica, A. C., Loma del Bosque 115, León, Gto 37150, Mexico
Ctr Invest Opt AC, Loma Bosque 115, Leon 37150, Gto, Mexico
Mares, Carlos:
Universidad Autónoma de San Luis Potosí, Instituto de Geología, Av. Dr. Manuel Nava N.5, Zona Universitaria, San Luis Potosí, SLP 78240, Mexico
Univ Autonoma San Luis Potosi, Inst Geol, Av Dr Manuel Nava 5, San Luis Potosi 78240, Slp, Mexico
Sarocchi, Damiano:
Universidad Autónoma de San Luis Potosí, Instituto de Geología, Av. Dr. Manuel Nava N.5, Zona Universitaria, San Luis Potosí, SLP 78240, Mexico
Univ Autonoma San Luis Potosi, Inst Geol, Av Dr Manuel Nava 5, San Luis Potosi 78240, Slp, Mexico
Cerca, Mariano:
Lab. de Mecánica de Geosistemas, Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3000, Col. Juriquilla, Queretaro, 76230, Mexico
Univ Nacl Autonoma Mexico, Ctr Geociencias, Lab Mecan Geosistemas, Blvd Juriquilla 3000, Queretaro 76230, Mexico
Valdivia, Ricardo:
Centro de Investigaciones en Óptica, A. C., Loma del Bosque 115, León, Gto 37150, Mexico
Ctr Invest Opt AC, Loma Bosque 115, Leon 37150, Gto, Mexico
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