Numerical simulation of the stress strain state of base of the pile foundations’ fragment by the loading of the raft, not connected with the pile, in the conditions of field test

Authors

  • V. L. Sedin Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro, Ukraine
  • K. M. Bikus Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro, Ukraine
  • V. V. Kovba Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro, Ukraine
  • Yu. Yu. Volnianskyi Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro, Ukraine

Keywords:

numerical simulation, staged loading of the rafts’ fragment of the pile foundation, additional tangential stresses, hardening soil model

Abstract

Purpose. Perform numerical simulation of the stressed strain state of the base of the pile foundation fragment by the loading of the raft, not connected with the pile and compare it with the results obtained under field conditions. Methodology. Creation of a model of the ground foundation of a pile foundation provided that there is no pile connection and a rafts’ fragment in the SC Plaxis and the staged loading of the fragment of the raft; use hardening soil model. To reproduce real conditions, in addition to the pile and plate studied, part of the pile investigation was modeled. Results. The picture of the effect of a single load of the raft on the behavior of the pile unconnected with it was obtained, the formation of additional tangential stresses around the pile and its displacement was recorded. Results of numerical modeling in comparison with the data of the field experiment. Originality. Numerical simulation was reproduced the conditions of full-scale experiment and fixed deformations of the soil under the plate, which provoked the movement not only of the pile being investigated (not connected with the fragment of the grillage), but also of surrounding piles located at a distance of 3 m. Practical value. Numerical modeling of the stress-strain state of the raft and pile fragment demonstrates satisfactory convergence with the results of the full-scale experiment, which indicates adequately selected parameters of the elastoplastic model with hardening of the soil in SC Plaxis PC. The high accuracy of the comparison allows us to anticipate the drafts of the pile and raft, provided there is no connection between them, as part of the foundation, and use a ground model with matched parameters for further modeling of the foundation and above-ground structure.

Author Biographies

V. L. Sedin, Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro

Dr. Sc. (Tech.), Prof.

K. M. Bikus, Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro

Ph. D., Assos. prof.

V. V. Kovba, Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro

postgraduate student

Yu. Yu. Volnianskyi, Foundation Engineering Department, Pridneprovs'k State Academy of Civil Engineering and Architecture, 24A, Chernishevskogo str., Dnipro

postgraduate student

References

Boyko I.P. and Sakharov B.O. Modeliuvannia neliniinogo deformuvannia gruntiv osnovy z urakhuvanniam strukturnoi mitsnosti v umovakh prybudovy [Modeling of nonlinear deformation of soil bases taking into account structural strength under conditions of an extension ] Budivelni konstruktsii [Building constructions]. - K.: NDIBK, 2004, Vol.61, №2, pp. 27-33. (in Ukrainian).

Vinnikov Yu.L. Matematychne modeliuvannia vzaiemodii fundamentiv z ushchilnenymy osnovamy pry ikh zvedenni ta nastupnii roboti: Monohrafiia [Mathematical modeling of foundations interaction with compacting basics during their constructions and following work: Monograph] – Poltava: PoltNTU imeni Yuriia Kondratiuka, 2016, 280 p.,. ( in Ukrainian).

Golubev A.Y. and Seletskiy A.V. K voprosu o vybore modeli grunta dlia geotekhnicheskikh raschetov [On the choice of soil model for geotechnical calculations]. Aktualnyye nauchno-tekhnicheskiye problemy sovremennoy geotekhniki [Current scientific and technical problems of modern geotechnics]. Tom 2. SPb.: SPbHASU Publ., 2009, pp. 6–10. ( in Russian).

Znamenskiy V.V., Ruzayev A.M. and Polynkov Y.N. Sravneniye rezultatov naturnykh eksperymentov s raschetami, vypolnennymi pri pomoshchi konechno-elementnoy programmy Plaxis 3D Foundation dlia zabivnykh svay v glinistykh gruntakh [Comparison of the results of full-scale experiments with calculations performed with the finite element program Plaxis 3D Foundation for driven piles in clay soils]. Vestnik Moskovskogo gosudarstvennogo stroitelnogo universiteta [Scientific and Engineering Journal for Construction and Architecture] – Moscow, 2008, no. 2, pp. 18-23. ( in Russian).

Brinkgreve R.B.J. and Swolf W.M. Rukovodstvo polzovatelia PLAXIS 3D Foundation. Versiia 2 [PLAXIS 3D Foundation User Guide. Version 2]: – Sankt-Peterburg: NIP-Informatika Publ., 2007. ( in Russian).

Sedin V.L., Bikus E.M. and Kovba V.V. Primeneniye modeli uprochniaiushchegosia grunta v chislennom modelirovanii buroinektsionnoy svai bolshogo diametra [Aplication of the hardening soil model for numerical simulation of a continuous flight auger pile having large diametre] Geotekhnika [Geotechnics], 2014, no.3, pp.32-40. (in Russian).

Strokova L. A. Opredeleniye parametrov dlia chislennogo modelirovaniia gruntov [Determination of parameters for numerical modeling of soils] Izvestiia Tomskogo Politekhnicheskogo universiteta. [Proceedings of the Tomsk Polytechnic University] 2008, Vol. 313, no. 1, pp. 69–74. (in Russian).

Ter-Martyrosian A.Z., Mirnyy A.Yu., Sidorov V.V. and Sobolev E.S. Opredeleniye parametrov modeli Hardening Soil po rezultatam laboratornykh ispytaniy [Determination of the parameters of the Hardening Soil model based on the results of laboratory tests]. Geotekhnika. Teoriia i praktika. Obshcherossiyskaia konferentsiia molodykh uchenykh, nauchnykh sotrudnikov i spetsialistov: mezhvuzovskiy tematicheskiy sbornik trudov [Geotechnics. Theory and practice. All-Russian conference of young scientists, researchers and specialists: interuniversity thematic collection of works]. SPb.:SPbHASU, 2013, pp. 141–146. (in Russian).

Barla Marco and Barla Giovanni. Torino subsoil characterization by combining site investigations and numerical modelling. Geomechanics and Tunelling. 2012. Vol. 3. Pp.214–232.

Truty A. and Obrzud R. Improved formulation of the hardening soil model in the context of modeling the undrained behavior of cohesive soils. Studia Geotechnica et Mechanica, Vol. 37, No. 2, 2015.

Published

2017-10-24

Issue

Section

Computer systems and information technologies in education, science and management