DEM modelling of cone penetration tests in a double-porosity crushable granular material
Visualitza/Obre
10.1016/j.compgeo.2015.12.001
Inclou dades d'ús des de 2022
Cita com:
hdl:2117/106623
Tipus de documentArticle
Data publicació2016-03
Condicions d'accésAccés obert
Llevat que s'hi indiqui el contrari, els
continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
:
Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
Abstract
A three-dimensional discrete element model is used to investigate the effect of grain crushing on the tip resistance measured by cone penetration tests (CPT) in calibration chambers. To do that a discrete analogue of pumice sand, a very crushable microporous granular material, is created. The particles of the discrete model are endowed with size-dependent internal porosity and crushing resistance. A simpli-
fied Hertz–Mindlin elasto-frictional model is used for contact interaction. The model has 6 material parameters that are calibrated using one oedometer test and analogies with similar geomaterials. The calibration is validated reproducing other element tests. To fill a calibration chamber capable of containing a realistic sized CPT the discrete analogue is up-scaled by a factor of 25. CPT is then performed at two different densities and three different confinement pressures. Cone tip resistance in the crushable material is practically insensitive to initial density, as had been observed in previous physical experiments. The same CPT series is repeated but now particle crushing is disabled. The ratios of cone tip resistance between the two types of simulation are in good agreement with previous experimental comparisons of hard and crushable soils. Microscale exploration of the models indicates that crushing disrupts the buttressing effect of chamber walls on the cone. DEM modelling of cone penetration tests in a double-porosity crushable granular material.
CitacióCiantia, M., Arroyo, M., Butlanska, J., Gens, A. DEM modelling of cone penetration tests in a double-porosity crushable granular material. "Computers and geotechnics", Març 2016, vol. 73, p. 109-127.
ISSN0266-352X
Versió de l'editorhttp://www.sciencedirect.com/science/article/pii/S0266352X15002566
Fitxers | Descripció | Mida | Format | Visualitza |
---|---|---|---|---|
Ciantia cone cr ... -D-15-00438R2 for DRAC.pdf | 2,730Mb | Visualitza/Obre |