The article deals with numerical analyses of a Continuous Flight Auger (CFA) pile. The analyses include a comparison of calculated and measured load-settlement curves as well as a comparison of the load distribution over a pile's length. The numerical analyses were executed using two types of software, i.e., Ansys and Plaxis, which are based on FEM calculations. Both types of software are different from each other in the way they create numerical models, model the interface between the pile and soil, and use constitutive material models. The analyses have been prepared in the form of a parametric study, where the method of modelling the interface and the material models of the soil are compared and analysed.
Our analyses show that both types of software permit the modelling of pile foundations. The Plaxis software uses advanced material models as well as the modelling of the impact of groundwater or overconsolidation. The load-settlement curve calculated using Plaxis is equal to the results of a static load test with a more than 95 % degree of accuracy. In comparison, the load-settlement curve calculated using Ansys allows for the obtaining of only an approximate estimate, but the software allows for the common modelling of large structure systems together with a foundation system.
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Almeida V. S. - De Paiva J. B. (2007) Static analysis of soil/pile interaction in layered soil by BEM/BEM coupling. Advances in Engineering Software. No. 38 pp. 835-845.
Brown D. A. (2005) Practical consideration in the selection and use of continuous flight auger and drilled displacement piles. Advances in design and testing deep foundations Texas U.S. pp. 251-261.
Coyle H. M. - Reese L. C. (1966) Load transfer for axially loaded piles in clay. Soil Mechanics and Foundations 1966 No. 92 pp. 1-26.
Cummins D. (2007) Comparison of performance of CFA piles in weak rock with Eurocode design predictions. Presentations from 18th European Young Geotechnical Engineers Conference held in Ancona Italy.
Dijkstra J. - Broere W. - Heeres O. M. (2011) Numerical simulation of pile installation. Computers and geotechnics No. 38 pp. 612-622.
Feda J. (1977) Interaction between pile and ground. Prague Academia 156 pp. [in Czech].
Fleming K. - Weltman A. - Randolph M. - Elson K. (2008) Piling Engineering - Third Edition. Taylor & Francis e-Library 398 pp. ISBN 0-203-937654-3
Gavin K. G. - Cadogan D. - Casey P. (2009) Shaft Capacity of Continuous Flight Auger Piles in Sand. American Society of Civil Engineers pp. 780-798 ISSN 1943-5606
Hruštinec L. (2014) Numerical analysis of the interaction between shallow (square circular strip) foundations and subsoil. Journal of civil engineering and architecture. Vol. 7 No. 7 pp. 875-886 ISSN 1934-7359
Husár R. (2008) Ground investigation for Centrál building Terratest Bratislava 29 pp. [in Slovak].
Kim Y. - Jeong S. (2011) Analysis of soil resistance on laterally loaded piles based on 3D soil-pile interaction. Computers and geotechnics. No. 38 pp. 248-257.
Mandolini A. - Romandini M. - Russo G. - Viggiani C. (2002) Full Scale Loading Tests on Instrumented CFA Piles. Deep Foundations 2002 American Society of Civil Engineers pp. 1088-1097 ISBN: 978-0-7844-0601-4
Masopust J. (1994) Bored Piles. Prague Čenek a Ježeks.r.o. 263 pp. [in Czech].
Miča L. - Chalmovský J. - Fiala R. - Račanský V. (2011) Numerical analysis of retaining structures. CERN academic publishing Brno 143 pp. ISBN 978-80-7204-773-4 [in Czech]
Mohamedzein Y.E.A. - Mohamed M.G. - El Sharief A.M. (1999) Finite element analysis of short piles in expansive soils. Computers and Geotechnics Vol. 24 / No. 3 pp. 231-243 ISSN: 0266-352X
Nejad F. P. - Jaksa M. B. - Kakhi M. - McCabe B. A. (2009) Prediction of pile settlement using artificial neutral networks based on standard penetration test data. Computers and geotechnics No. 36 pp. 1125 - 1133.
NeSmith W. (2002) Static Capacity Analysis of Augered Pressure- Injected Displacement Piles. Deep Foundations 2002 U.S. pp. 1174-1186.
Plaxis (2011) Material Models Manual 202 pp. Available at: http:// www.plaxis.nl/files/files/2D2011-3-Material-Models.pdf (accessed at 08/05/2014).
Pochman R. - Šimek J. (1989) Pile foundations. Commentary to ČSN 73 1002. FÚNM Prague 75 pp. ISBN 80-85 111-04-7 [in Czech]
Pokorný M. - Šujan M. (2004) Lakeside Office Park Bratislava Preliminary ground investigation - Ground investigation report. EQUIS Bratislava 42 pp. [in Slovak].
Pucker T. - Grabe J. (2012) Numerical simulation of the installation process of full displacement piles. Computers and geotechnics No. 45 pp. 93-106.
Said I. - De Gennaro V. - Frank R. (2009) Axisymmetric finite element analysis of pile loading tests. Computers and Geotechnics No. 36 pp. 6-19.
Shanz T. - Vermeer P. A. - Bonnier P. G. (1999) The Hardening Soil model: Foundation and verification. Beyond 2000 in computational geotechnics - 10 Years of Plaxis. Balkema Rotterdam ISBN 90-5809-040-X
Sheng D. - Eigenbrod K. D. - Wriggers P. (2005) Finite element analysis of pile installation using large-slip fictional contact. Computers and geotechnics No. 32 pp. 17-26.
Stacho J. (2013) Alternative calculation method for the design of CFA piles. Juniorstav 2013 (CD-ROM): 15th International conference of PhD students.VUT Brno Brno University of Technology 8 pp. ISBN 978-80-214-4670-0 [in Slovak]
Stacho J. (2014) Determination of CFA and DDS pile resistance by using FEM. Juniorstav 2014 (CD-ROM): 16th International conference of PhD students.VUT Brno Brno University of Technology 8 pp. ISBN 978-80-214-4670-0 [in Slovak]
Tomlinson M. - Woodward J. (2007) Pile design and construction practise - Fifth edition. Taylor & Francis e-Library 551 pp. ISBN 0-203-96429-2
Viggiani C. - Mandolini A. - Russo G. (2012) Piles and Pile Foundations. Taylor & Francis U.K. 278 pp. ISBN 978-0-415-49066-5
Wakai A. - Gose S. - Ugai K. (1999) 3D elasto-plastic finite element analyses of pile foundations subjected to lateral loading. Soils and Foundations Vol. 39 pp. 97-111 ISSN 134-7452
Wang Z. - Xie X. - Wang J. (2012) A new nonlinear method for vertical settlement prediction of a single pile and pile groups in layered soils. Computers and geotechnics No. 45 pp. 118-126.
Wehnert M. - Vermeer P. A. (2004) Numerical analyses of load tests on bored piles. Numerical models in geomechanics Proceedings of the 9th Symposium on Numerical Models in Geotechnics Ottawa Canada pp. 505-516 ISBN 9789058096364