Steady state of solid-grain interfaces during simulated CPT

• Autorzy: Butlanska J. , Arroyo M. , Gens A.

Identyfikatory

DOI

10.2478/sgem-2013-0034

• Języki publikacji: EN

Abstrakty

EN

It has recently been shown (Arroyo et al. [1]) that 3D DEM models are able to reproduce with reasonable accuracy the macroscopic response of CPT performed in calibration chambers filled with sand. However, the cost of each simulation is an important factor. Hence, to achieve manageable simulation times the discrete material representing the sand was scaled up to sizes that were more typical of gravel than sand. A side effect of the scaled-up discrete material size employed in the model was an increased fluctuation of the macro-response that can be filtered away to observe a macroscopic steady-state cone resistance. That observation is the starting point of this communication, where a series of simulations in which the size ratio between penetrometer and particles is varied are systematically analyzed. A micromechanical analysis of the penetrometer–particle interaction is performed. These curves reveal that a steady state is arrived also at the particle–cone contact level. The properties of this dynamic interface are independent of the initial density of the granular material.

Słowa kluczowe

EN

cone penetration; granular material; CPT tests; steady state

PL

penetracja stożka; sondowanie CPT; stan równowagi; materiał ziarnisty

• Wydawca: De Gruyter
• Czasopismo: Studia Geotechnica et Mechanica
• Rocznik: 2013
• Tom: Vol. 35, nr 4
• Strony: 13--22
• Opis fizyczny: Bibliogr. 11 poz., tab., rys.

Twórcy

autor

Butlanska J.

• Universitat Politècnica de Catalunya, BarcelonaTECH, Department of Geotechnical Engineering, Barcelona, Spain

autor

Arroyo M.

• Universitat Politècnica de Catalunya, BarcelonaTECH, Department of Geotechnical Engineering, Barcelona, Spain

autor

Gens A.

• Universitat Politècnica de Catalunya, BarcelonaTECH, Department of Geotechnical Engineering, Barcelona, Spain

Bibliografia

• [1] ARROYO M., BUTLANSKA J., GENS A., CALVETTI F., JAMIOLKOWSKI M., Cone penetration tests in a virtual calibration chamber, Gèotechnique, 2011, 61(6), 525–531, DOI: 10.1680/geot.9.P.067.
• [2] ARROYO M., BUTLANSKA J., GENS A., O’SULLIVAN C., The effect of radial walls on CPT in a DEMbased virtual calibration chamber, Third International Symposium on Computational Geomechanics (ComGeo III), Kraków, Poland, 21–23 August, 2013.
• [3] BUTLANSKA J., ARROYO M., GENS A., Homogeneity and symmetry in DEM models of cone penetration, Proc. AIP Conf. on Powders and Grains, 2009, 1145, 425–429.
• [4] BUTLANSKA J., ARROYO M., GENS A., (2010a), Size effects on a virtual calibration chamber, Numerical Methods in Geotechnical Engineering: NUMGE 2010, 2010a, 225–230.
• [5] BUTLANSKA J., ARROYO M., GENS A., Virtual Calibration Chamber CPT tests on Ticino sand, Proc. 2nd International Symposium on Cone Penetration Testing, CPT'10, Huntington beach, California, Robertson & Mayne (eds.), 2010b, Vol. 2, 217–224.
• [6] CUI L., O’SULLIVAN C., O’NEILL S., An analysis of the triaxial apparatus using a mixed boundary three-dimensional discrete element model, Gèotechnique, 2007, 57(10), 831–844, DOI: 10.1680/geot.2007.57.10.831.
• [7] CUNDALL P.A., STRACK O.D.L., A discrete numerical model for granular assemblies, Gèotechnique, 1979, 29(1), 47–65, DOI: 10.1680/geot.1979.29.1.47.
• [8] LIN J., WU W., Numerical study of miniature penetrometer in granular material by discrete element method, Philosophical Magazine, October 2012, 92(28–30), 3474–3482.
• [9] Itasca, PFC3D Particle flow code in three dimensions V3.1 User Guide, Minneapolis: Itasca Consulting Group, 2005.
• [10] MARKETOS G., BOLTON M.D., Flat boundaries and their effect on sand testing, Int. J. Numer. Anal. Meth. Geomech., 2010, 34, 821–837.
• [11] MCDOWELL G., FALAGUSH O., YU H.S., A particle refinement method for simulating DEM of cone penetration testing in granular materials, Géotechnique Letters, 2012, 2, 141–147, http://dx.doi.org/10.1680/geolett.12.00036.