- Title
- Numerical analysis of a penetrometer free-falling into a non-uniform soil layer
- Creator
- Moavenian, M.; Nazem, M.; Carter, J. P.
- Relation
- Third International Symposium on Computational Geomechanics (ComGeo III). Proceedings of the Third International Symposium on Computational Geomechanics (ComGeo III) (Krakow, Poland 21-23 August, 2013) p. 562-569
- Publisher
- International Centre for Computational Engineering
- Resource Type
- conference paper
- Date
- 2013
- Description
- Evaluating the mechanical properties of soils is essential for successfully designing and constructing large infrastructure, including dams, bridges and offshore oil and gas platforms. The cone penetration test is utilized as an in situ test for exploring the geotechnical properties of the soils at these sites, but often it cannot be conducted or is difficult to conduct at relatively inaccessible sites, such as seabeds, riverbeds and wetlands. On the other hand, dynamic penetrometers have been used for offshore oil and gas industry applications such as pipeline feasibility studies and anchoring systems, and military applications including naval mine countermeasures and terminal ballistic studies. The main challenge of using dynamic penetrometers is the interpretation of their test results in order to deduce the mechanical properties of soil via experimental or theoretical relations. Recently, a robust numerical method based on the Arbitrary Langrangian-Eulerian (ALE) technique has been developed for analysing dynamic penetration problems and used to investigate a smooth penetrometer free falling into a uniform layer of clayey soil. Numerical as well as experimental results indicate that the penetration characteristics depend on the mechanical properties of the soil including its stiffness and strength parameters as well as the geometry of the penetrometer and its initial impact energy. In this study, the ALE method was employed to study the effect of shear strength increase with depth (a common condition of seabed deposits) on the penetration characteristics of a free falling penetrometer. This was achieved by conducting more than two thousand numerical experiments to accurately correlate the mechanical properties of the soil and penetrometer to the total time and total depth of penetration.
- Subject
- soils; dams; cone penetration test; dynamic pentrometers
- Identifier
- http://hdl.handle.net/1959.13/1062979
- Identifier
- uon:17185
- Identifier
- ISBN:9789609875028
- Language
- eng
- Full Text
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