Modelling of fall-cone tests with strain-rate effects

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Date
2017-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
9
293-301
Series
Procedia Engineering, Volume 175
Abstract
Material Point Method (MPM) is a numerical method, which is well suited for large displacement simulations. Large displacements problems are relatively common in geotechnics, including post-failure behaviour of landslides as well as a wide range of problems involving penetration into the soil body. One of those problems is the fall-cone test, commonly used to establish the undrained shear strength and the sensitivity of saturated fine grained soils. This paper shows a Generalized Interpolation Material Point Method (GIMP) simulation replicating published free-fall cone experiment performed on a kaolin clay. In the fall-cone tests, the penetration characteristics of the cone, such as velocity and total penetration depth depend on the soil properties. Those properties are affected greatly by the strain-rate which must be accounted for in a numerical simulation. Hence, the simulations shown uses a Mohr-Coulomb / Tresca material extended with strain-rate effects. The presented numerical simulations are comparedwith the published fall-cone experiment in which displacement and force were measured. The comparison indicates that Generalized Interpolation Material Point Method and Mohr-Coulomb / Tresca model extended with strain-rate effects are able to replicate the fall-cone penetration test very well.
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Keywords
generalized interpolation material point method, fallcone test, strain rate effects
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Citation
Tran , Q , Sołowski , W T , Karstunen , M & Korkiala-Tanttu , L 2017 , ' Modelling of fall-cone tests with strain-rate effects ' , Procedia Engineering , vol. 175 , pp. 293-301 . https://doi.org/10.1016/j.proeng.2017.01.029