Coupled thermo-hydro-mechanical modelling of crack development along fossil dinosaur’s footprints in soft cohesive sediments
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Estadístiques de LA Referencia / Recolecta
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/192107
Tipus de documentText en actes de congrés
Data publicació2013
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
The fossil footprints have been used to back calculate the properties of
the soil in the Age of Dinosaurs. The interpretation of fossil footprints requires the
simulation of the processes during as well as after the footprint was generated. Some
radial and circumferential cracks were observed occurring on track walls of the footprints.
It is supposed that the origin of these cracks can be elucidated by means of footprint’s
drying after the footprint is generated.
In order to verify this hypothesis and to allow for a precise interpretation of the dinosaur
tracks, a series of laboratory and numerical simulation tests was carried out. The
tests were designed to mimic the shape evolution of the footprint of the dinosaur during
drying. Within the experiments the change of environmental humidity and temperature
was monitored and recorded. The laboratory experiment showed that both the radial and
circumferential cracks appear during the drying process.
The numerical simulation has been performed to better understand and to account for
the cracking mechanism in dinosaur’s tracks. In this study the behaviour of a silty soil
during drying is numerically simulated by means of a 3D model and performing coupled
thermo-hydro-mechanical analysis utilizing the finite element program CODE BRIGHT.
Based on the analysis of the tensile stresses along the sample, it was found that the highest
tensile stress is on the track wall and it is due to soil shrinkage. It can be concluded that
the high tensile stress induced during drying is the most possible reason for cracks to
appear in radial and circumferential direction along the foot’s imprint.
ISBN978-84-941407-6-1
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Coupled-2013-05 ... hermo-hydro-mechanical.pdf | 2,359Mb | Visualitza/Obre |