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Simulation of Passive Soil Failure and Cutting Processes in Sand

[+] Author Affiliations
Mahbubur Rahman, Sape Miedema, Dingena Schott

Delft University of Technology, Delft, The Netherlands

Morteza Abdeli

Royal Boskalis Westminster, Papendrecht, The Netherlands

Paper No. OMAE2011-49226, pp. 809-823; 15 pages
doi:10.1115/OMAE2011-49226
From:
  • ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 7: CFD and VIV; Offshore Geotechnics
  • Rotterdam, The Netherlands, June 19–24, 2011
  • ISBN: 978-0-7918-4439-7
  • Copyright © 2011 by ASME

abstract

Discrete Element Modeling (DEM) is a method which is designed to simulate the behavior of a material by modeling the interactions between discrete elements i.e. particles. The mechanical interactions between particles and also between particles and the walls in are modeled by springs, dash-pots and friction sliders. The properties of the material and interactions (Poisson’s ratio, shear modulus and density, coefficients of restitution, rolling and static friction) relate to the particle properties and not to the bulk properties. If DEM (using software like EDEM™ & PFC™) is reliable by validation with analytical models, it will have many applications in dredging, specifically for investigating underwater cutting processes in sand, clay and rock. Since people have no real experience with this method in dredging, the first step is to model a number of well-known examples like passive earth pressure and the cutting of dry sand and compare the simulation results with the analytical solutions. During this first step the relation between particle and bulk properties has also been investigated. Since the EDEM™ software does not yet contain a code to calculate porosity changes and pore water pressure (without coupling with CFD), this is implemented during a second step. The final target of this study is to use the DEM software to possible modify Miedema and Evans analytical solutions for sand and rock cutting at 3000 m water depths, but in the future the modeling of erosion could also be a topic of research. The current research consisted of becoming acquainted with the software and carrying out basic tests to verify the outcomes. During the research it emerged that the shape of the particles determines whether the expected behavior of sand can be replicated. Also the relation between micro and macro properties, i.e. the static friction of particle and the angle of internal friction, was investigated. Using a particle consisting of a number of spheres with an irregular shape did give very good results. Passive earth pressure simulations gave a very good match with the analytical solution, as did cutting tests in dry sand with a number of cutting angles. Using a cutting angle of 90 degrees resulted in the occurrence of a wedge in front of the blade with a wedge angle corresponding to literature.

Copyright © 2011 by ASME
Topics: Sands , Simulation , Cutting , Failure , Soil

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