Numerical investigations of work of driven pile on claystones

Vestnik MGSU 2/2019 Volume 14
  • Sychkina Evgeniya N. - Perm National Research Polytechnic University (PNRPU) Candidate of Technical Sciences, Associate Professor of the Department of Construction Technology and Geotechnics, Perm National Research Polytechnic University (PNRPU), 29 Komsomolsky prospekt, Perm, 614990, Russian Federation.
  • Antipov Vadim V. - Perm National Research Polytechnic University (PNRPU) postgraduate student of Department of Construction Technology and Geotechnics, Perm National Research Polytechnic University (PNRPU), 29 Komsomolsky prospekt, Perm, 614990, Russian Federation.
  • Ofrikhter Yan V. - Perm National Research Polytechnic University (PNRPU) postgraduate student of Department of Construction Technology and Geotechnics, Perm National Research Polytechnic University (PNRPU), 29 Komsomolsky prospekt, Perm, 614990, Russian Federation.

Pages 188-198

Introduction. Reviewed the features of the work of the pile on Permian claystones with the help of numerical and field experiments, analytical calculations. Materials and methods. Numerical modeling was performed in the Plaxis 3D and Midas GTS NX software packages. Full-scale tests of driven piles are made in accordance with the requirements of GOST 20276-2012. The obtained results are compared with the results of analytical calculations according to SP 24.13330.2011. Results. The scientific novelty of the investigation consists in a comparative analysis of the results of numerical modeling of the interaction of a driving pile with claystones with the results of field tests and analytical calculations. Finite element analysis in software package Plaxis 3D using Hardening Soil model shows higher values of settlement (up to 6 times) in relation to stabilized settlement of full-scale pile tests. Calculations in the software package Midas GTS NX showed overestimated values of pile settlements in relation to full-scale pile tests (13-24 times). Analytical calculations in accordance with SP 24.13330.2011 also showed overestimated (up to 3 times) values of the maximum pile settlement in relation to the stabilized settlement during full-scale pile tests. Conclusions. The calculations by the finite element method in the package Plaxis 3D and Midas GTS NX, by the analytical method according to SP 24.13330.2011, show overestimated values of settlement in relation to the stabilized settlement of piles on claystones. Using the Linear-Elastic model for claystones in numerical calculations in Plaxis 3D provides a value close to the settlement of full-scale pile. However, the use of this model is not fully justified for claystones due to the presence of residual deformations and the nonlinear character of pile settlement during loading. Necessary to correct the existing numerical and analytical methods for calculating pile foundations on claystones. It is necessary to continue the work on the further generalization of the experience of arranging piles on weathered claystones in order to evaluate the long-term work of not only a single pile, but also a pile foundation.

DOI: 10.22227/1997-0935.2019.2.188-198

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RESEARCH OF THE ADSROPTION-SOLVATE LAYER OF BITUMEN ON THE SURFACE OF THE MINERAL FILLER

Vestnik MGSU 11/2012
  • Inozemtsev Sergey Sergeevich - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, test engineer, Research and Educational Center on "Nanotechnology", Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7-499-188-04-00; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Pozdnyakov Mikhail Konstantinovich - Moscow State University of Civil Engineering (MGSU) postgraduate student, +7 (499) 188-04-00, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.
  • Korolev Evgeniy Valerevich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Advisor Russian Academy of Architectural and Construction Sciences (RAACS), Vice-Rector for Education, Director, Research and Educational Centre for Nanotechnologies, +7 (495) 287-49-14, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 159 - 167

In the article, the authors substantiate the employment of the rheological method of identifi cation of the thickness of the bitumen layer formed on the surface of the mineral component. The
analysis of existing methodologies of assessment of the physical and chemical activity of mineral
components in relation to the bitumen has proven the unavailability of any universal methodology to
substantiate the use of mineral fillers to be added to the asphalt concrete. The authors have demonstrated
that identification of thickness considered as a kinetic and an adsorption layer requires
the employment of nothing else but the bitumen. Viscosity measurements of disperse systems composed
of bitumen and mineral components are to be taken at different temperatures.
The filling range of the above systems satisfying the Einstein equation (under 5% by volume)
has also been identified. The nature of dependence between the viscosity fluctuation pattern of the
disperse systems composed of bitumen and the mineral filler, on the one hand, and the degree of filling
and the temperature, on the other hand, has been identified. The nature of dependence between
the viscosity fluctuation of bitumen and the castor oil and their temperature has been identified, as
well. The authors have also calculated the temperature at which the viscosity of bitumen reaches its
minimum value (T = 220 °C). The authors have demonstrated that the mineral components under
research produce only a kinetic layer that turns thinner as the temperature goes up, whereas no
adsorption layer can be identified experimentally through the employment of the rheological method.
Comparison of the data obtained by the authors with the theoretical findings demonstrates
their sufficient convergence, reliable repeatability of the proposed method of identification of thickness
of the structured bitumen, and physical and chemical activity of the mineral component. The
data presented herein have also proven the inexpediency of application of the methodology of
identifi cation of adhesion between bitumen and the mineral filler according to State Standard GOST
11508-74*.

DOI: 10.22227/1997-0935.2012.11.159 - 167

References
  1. Korolev E.V., Beregovoy V.A., Bormotov A.N., Eremkin A.I. Degradation Model and Method of Projecting the Durability of Composites. Proceedings of the International Conference «Concrete Durability: Achievement and Enhancement». UK, Scotland, University of Dundee, pp. 345—356.
  2. Proshin A.P., Korolev E.V., Boltyshev S.A., Koroleva O.V. Vybor kineticheskoy modeli destruktsii kompozitsionnykh materialov. Parametry protsessa [Selection of a Kinetic Model of Decomposition of Composite Materials. Process Parameters]. Izvestiya vuzov. Stroitel’stvo [News of Institutions of Higher Education. Construction]. 2005, no. 3, pp. 32—36.
  3. Gar’kina A.I., Danilov A.M., Korolev E.V. Vybor kineticheskoy modeli destruktsii kompozitsionnykh materialov. Parametry protsessa [Selection of a Kinetic Model of Decomposition of Composite Materials. Process Parameters]. Obozrenie prikladnoy i promyshlennoy matematiki [Review of Applied and Industrial Mathematics]. 2008, no. 3, vol. 15, pp. 459—460.
  4. Bakhrakh G.S. K otsenke tolshchiny adsorbtsionno-sol’vatnogo sloya bitumov na poverkhnosti chastits [About the Assessment of Thickness of the Adsorption-solvate Layer of Bitumen on the Surface of Particles]. Kolloidnyy zhurnal [The Colloid Journal]. 1969, no.1, vol 39, pp. 8—12.
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  14. Boguslovskiy A.M. Osnovy reologii asfal’tobetona [Fundamentals of Rheology of Asphalt Concrete]. Moscow, Vysshaya shkola publ., 1972, 200 p.

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RHEOLOGY OF VISCOPLASTIC LANDSLIDES UNDER NATURAL CONDITIONS AND IN CASE OF PILING STABILIZATION

Vestnik MGSU 11/2012
  • Buslov Anatoliy Semenovich - Moscow State Open University named after V.S. Chernomyrdin (MGOU) Doctor of Technical Sciences, Professor, Chair, Department of Construction Operations, Beddings and Foundations +7 (495) 683-87-97, Moscow State Open University named after V.S. Chernomyrdin (MGOU), 22 Korchagina st., Moscow, 129626, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Kalacheva Elena Nikolaevna - Ryazanskiy Branch, Moscow State Open University named after V.S. Chernomyrdin , Ryazanskiy Branch, Moscow State Open University named after V.S. Chernomyrdin, 2a Kolhoznaya St., 390046, Ryazan, Russian Federation.

Pages 45 - 54

The authors analyze rheological equations of viscoplastic landslides under natural conditions
and in the presence of a sparse row of piles as an anti-slide barrier.
Rheology of viscoplastic slides in the presence of buttresses that significantly alter the pattern
and speed of their motion has enjoyed little attention of researchers, although it plays an important
role in the analysis of stabilization of landslide flows. Elements of tensor calculus are used to analyze
the motion of the viscoplastic matter. An exact solution to the problem of gravitational motion
alongside an inclined plane was used as the main one. It is proven that the motion pattern of the
viscoplastic matter contains rigid zones where the flow velocity is equal to zero.
In the event of motion of a layer alongside an inclined surface, the rigid zone moves together
with the viscous surface, and the overall velocity of the viscoplastic flow will be determined by the
rheology of the viscous surface.
This paper provides solutions designated for the identification of rigid zones of cohesive soils,
as well as soils that demonstrate internal friction and cohesion.
The authors have proven that whenever piles are used, the nucleus of the landslide mass is
stabilized.

DOI: 10.22227/1997-0935.2012.11.45 - 54

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  9. Seyhan F?rat, Mehmet Sar?b?y?k, Erkan Selebi. Lateral Load Estimation from Visco-plastic Mudflow around Cylindrical Row of Piles. Applied Mathematics and Computation, no. 173 (2006), pp. 803—821.
  10. Balmforth N.J., Craster R.V. and Sassi R. Shallow Viscoplastic Flow on an Inclined Plane. J. Fluid Mech., 2002, vol. 470, pp. 1—29.
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