Modelling of fall-cone tests with strain-rate effects

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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 compared with 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.
Original languageEnglish
Pages (from-to)293-301
Number of pages9
JournalProcedia Engineering
Volume175
DOIs
Publication statusPublished - Jan 2017
MoE publication typeA4 Article in a conference publication
EventInternational Conference on the Material Point Method for Modelling Large Deformation and Soil–Water–Structure Interaction - Delftares, Delft, Netherlands
Duration: 10 Jan 201713 Jan 2017
Conference number: 1
http://mpm2017.eu/home

Keywords

  • generalized interpolation material point method
  • fallcone test
  • strain rate effects

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