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FEM modelling of screw displacement pile interaction with subsoil
DOI:
https://doi.org/10.24425/ace.2023.147653Abstract
Predicting the Q-s settlement characteristics of piles is an important element in the designing of pile foundations. The most reliable method in evaluating pile-soil interaction is the static load test, preferably performed with instrumentation for measuring shaft and pile base resistances. This, however, is a mostly post-implementation test. In the design phase, prediction methods are needed, in which numerical simulations play an increasingly popular role. This article proposes a procedure for numerically modeling the interaction of screw displacement piles with soil using the ZSoil 2D FEM program. The procedure takes into account technological characteristics of this type of pile, such as the process of soil expansion during the screwing-in of the auger and the pressure of concrete mix after pile concreting. They significantly affect the soil stress state, which is a key parameter for the pile load capacity. Geotechnical parameters of the subsoil were adopted from CPTU probing and laboratory tests. Due to the physical complexity, a constitutive soil model “Hardening Soil” (HS) was used in the analyses. The modeling procedure was calibrated on the basis of the static load test results of several instrumented piles, which were carried out as part of the “DPDT-Auger” research project. As a result of these calibrations, generalized recommendations were derived for an entire single pile modeling process with the axisymmetric system of ZSoil program. These can be useful in the reliable FEM prediction of the Q-s characteristics for screw displacement piles for practical engineering purposes.References
[1] PN-EN:1997-1:2008 - Eurocode 7: Geotechnical design - Part 1: General rules. Brussels; Warsaw, 2008.
[2] A. Krasiński, Pale przemieszczeniowe wkręcane. Współpraca z niespoistym podłożem gruntowym. Politechnika Gdańska, Monografie, vol. 134. Gdńsk, 2013.
[3] A. Krasiński, ”Świder do wykonywania pali przemieszczeniowych wkręcanych (Auger for making screw displacement piles)”, Poland. Patent PL 235442 B1, Aug. 10, 2020.
[4] A. Krasiński, P. Więcławski, W. Tisler, T. Kusio, and M. Wiszniewski, Raport końcowy z projektu badawczego “DPDT-Auger”, nr POIR.04.01.04-00-0124/18: “Opracowanie metody i narzędzi do wykonywania kolumn/pali przemieszczeniowych wkręcanych w różnorodnych warunkach gruntowych na obszarze Polski wraz z przygotowaniem metodyki do projektowania i odbioru robót”. Gdańsk, 2022.
[5] S. Commend, S. Kivell, R.F. Obrzud, K. Podleś, A. Truty, and Th. Zimmermann, Computational geomechanics. Getting started with ZSOIL.PC. Lausanne, Switzerland, 2015.
[6] Th. Zimmermann, A. Truty, and K. Podleś, Numerics in geotechnics and structures. Switzerland: Rossolis Editions & Zace Services Ltd., 2015.
[7] A. Truty, Th. Zimmermann, K. Podleś, and R.F. Obrzud, ZSoil manual. Lausanne, Switzerland: Elmepress and Zace Services Limited, 2016.
[8] A. Truty and R. Obrzud, The hardening soil model - a practical guidebook. Z_Soil.PC 100701 report revised 2.01.2020. Lausanne, Switzerland: GeoDev Sarl, 2020.
[9] A. Krasiński and M. Wiszniewski, “Static load test on instrumented pile - field data and numerical simulations”, Studia Geotechnica et Mechanica, vol. 39, no. 3, pp. 17-25, 2017, doi: 10.1515/sgem-2017-0026.
[10] K.-P. Mahutka, F. König, and J. Grabe, “Numerical modelling of pile jacking, driving and vibro driving”, in Proceedings of International Conference on Numerical Simulation of Construction Processes in Geotechnical Engineering for Urban Environment, T. Triantafyllidis, Ed. Rotterdam: Balkema, 2006, pp. 235-246.
[11] S. Henke and J. Grabe, “Numerical modelling of pile installation”, in Proc. of 17th International Conference on Soil Mechanics and Foundation Engineering. Alexandria, Egypt, 2009, pp. 1321-1324.
[12] P. Basu and M. Prezzi, Design and Applications of Drilled Displacement (Screw) Piles. Final Raport FHWA/IN/JTRP-2009/28. Joint Transportation Research Program, Indiana Department of Transportation and Purdue University, 2009.
[13] A. Krasiński, “Numerical simulation of screw displacement pile interaction with non-cohesive soil”, Archives of Civil and Mechanical Engineering, vol. 14, no. 1, pp. 122-133, 2014, doi: 10.1016/j.acme.2013.05.010.
[14] A. Krasiński and T. Kusio, “Load-settlement characteristics of piles working in a group”, presented at 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul, 2017.
[15] J. Konkol, “Numerical analysis of pile installation effects in cohesive soils”, PhD thesis, Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, 2018.
[16] M. Cudny, Some aspects of the constitutive modelling of natural fine grained soils. Faculty of Civil and Environmental Engineering, Gdańsk University of Technology, Wydawnictwo IMOGEOR, 2013.
[17] T. Schanz and P.A. Vermeer, “Angles of friction and dilatancy of sand”, Géotechnique, vol. 46, no. 1, pp. 145-151, 1996, doi: 10.1680/geot.1996.46.1.145.
[18] P.K. Robertson, “Soil classification using the cone penetration test”, Canadian Geotechnical Journal, vol. 27, no. 1, pp. 151-158, 1990, doi: 10.1139/t90-014.
[19] R. Salgado and M.F. Randolph, “Analysis of cavity expansion in sand”, International Journal of Geomechanics, vol. 1, no. 2, pp. 175-192, 2001, doi: 10.1061/(ASCE)1532-3641(2001)1:2(175).
[20] A. Krasiński and M. Wiszniewski, “Identification of residual force in static load tests on instrumented screw displacement piles”, Studia Geotechnica et Mechanica, vol. 43, no. 4, pp. 438-451, 2021, doi: 10.2478/sgem-2021-0025.
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