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Vasenkova Ekaterina Viktorovna -
Moscow State University of Civil Engineering (National Research University) (MGSU)
Senior Lecturer, Department of Higher Mathematics, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoye shosse, Moscow, 129337, Russian Federation;
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Zuev Vladimir Vasil’evich -
Moscow State Institute of Radio Engineering, Electronics and Automation (MIREA
Doctor of Physical and Mathematical Sciences, Professor, chair, Department of Applied Mathematics and Informatics, Moscow State Institute of Radio Engineering, Electronics and Automation (MIREA, 20 Stromynka str., Moscow, 107996, Russian Federation;
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The basic problem of structural mechanics, namely the problem of pile shock loading sunk in a foundation, has been examined in an axisymmetric approach within defining relations for irreversible deformations offered earlier in the space of deformations. As a model of the theory of plasticity, the Mises model generalized by the authors has been accepted, the use of which solves a nonstationary system of nine two-dimensional equations with various entry and boundary conditions. Enlightened attitudes use approximate engineering approaches which allow estimating the behavior of a pile-foundation system. A solution is constructed mainly with the use of the theory of linear-elastic continuum. However they do not enable to consider various peculiarities of deformation behavior of soils and pile materials and to give an appropriate detailed picture of a system mode of deformation. Mechanical peculiarities of the behavior of foundation and pile materials discovered recently demand more enlightened attitudes to analyze a mode of deformation in a pile-foundation system considering both plasticity and fracture. The offered approach enables to give a complete picture of a mode of deformation in a pile-foundation system at any time and a picture of occurrence and development of plasticity and fracture zones.
DOI: 10.22227/1997-0935.2015.8.101-108
References
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- Ter-Martirosyan Z.G., Ala Said Mukhammed Abdul Malek, Ter-Martirosyan A.Z., Ainbetov I.K. Napryazhenno-deformirovannoe sostoyanie dvukhsloynogo osnovaniya s preobrazovannym verkhnim sloem [Stress-Strain State of a double-layer foundation with a transformed upper layer]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2008, no. 2, pp. 81—95. (In Russian)
- Zuev V.V., Shmeleva A.G. Osesimmetrichnoe udarnoe nagruzhenie uprugoplasticheskoy sredy s razuprochneniem i peremennymi uprugimi svoystvami [Axisymmetric Shock Loading of an Elasto-Plastic Medium with Softening and Variable Elastic Properties]. Vestnik Samarskogo gosudarstvennogo universiteta : Estestvennonauchnaya seriya [Vestnik of Samara State University : Natural Sciences]. 2007, no. 2 (52), pp. 100—106. (In Russian)
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- Zuev V.V. Opredelyayushchie sootnosheniya i dinamicheskie zadachi dlya uprugoplasticheskikh sred s uslozhnennymi svoystvami [Defining Relations and Dynamic Problems for Elasto-Plastic Media with Complicated Properties]. Moscow, Fizmatlit Publ., 2006, 176 p. (In Russian)
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Ter-Martirosyan Zaven Grigor'evich -
Moscow State University of Civil Engineering (MSUCE)
, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation;
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Trinh Tuan Viet -
Moscow State University of Civil Engineering (MSUCE)
postgraduate student, Department of Mechanics of Soils, Ground Foundation
and Foundation Mechanics, Moscow State University of Civil Engineering (MSUCE), 26, Yaroslavskoe Shosse, Moscow, 129337, Russian Federation;
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WITH ACCOUNT FOR COMPRESSIBILITY OF THE PILE SHAFT
The authors provide their solution to the problem of interaction of a long compressible pile that has a double-layer linear deformable base. The paper demonstrates that taking account of compressible properties of the pile material leads to qualitatively new distribution of shearing stresses over the surface of a cylindrical pile. It is noteworthy that increase of the pile length and stiffness of the upper section of the base raise the share of the load perceived by the surface of the pile. Besides, in particular conditions of the soil environment, the load perceived by the lower section of the base may reach approximately 20-30 % of the total load.
DOI: 10.22227/1997-0935.2012.4.28 - 34
References
- Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 550 p.
- Ter-Martirosyan Z.G, Nguyen Giang Nam. Vzaimodeystvie svay bol'shoy dliny s neodnorodnym massivom s uchetom nelineynykh i reologicheskikh svoystv gruntov [Interaction between Long Piles and Heterogeneous Soil Body with the Account for Nonlinear and Rheological Properties of Soils]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2008, no. 2, pp. 3—14.
- Ukhov S.B., Semenov V.V., Znamenskiy V.V., Ter-Martirosyan Z.G., Chernyshev S.N. Mekhanika gruntov, osnovaniya i fundamenty [Soil Mechanics, Bases and Foundations]. Moscow, ASV Publ., 2004, 566 p.
- Ter-Martirosyan Z.G., Trinh Tuan Viet. Vzaimodeystvie odinochnoy dlinoy svai s osnovaniem s uchetom szhimaemosti stvola svai [Interaction between a Single Long Pile and the Bedding with Account for Compressibility of the Pile Shaft]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2011, no. 8, pp. 104—111.
- Nguyen Giang Nam. Identification of the Settlement of the Round Die with Allowance of Its Embedding. Collected papers of the 4th International Scientific Conference of Young Scientists, Postgraduates, and Doctoral Students. Construction as Formation of the Living Environment. Moscow, MSUCE, 2006.
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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.
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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.
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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.
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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Ter-Martirosyan ZavenGrigorevich -
Moscow State University of Civil Engineering (MSUCE)
Doctor of Technical Sciences, Professor,
Distinguished Scholar of the Russian Federation, Head of Department of Soils, Ground Foundation
and Foundation Mechanics
8 (499) 261-59-88, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoeshosse, Moscow, 129337, Russia;
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The paper provides a definition of and a solution to the problems of interaction between long piles and the soil body as part of the slab-pile foundation with the due account for the interval between the piles, the length of piles and their correlations, as well as the nonlinear properties of soil identified by analytical and numerical methods through the application of Plaxis-2d software.
It is proven that the above properties produce a substantial impact onto the stress-strain state of soils that interact with the pile and the grid, and the impact values make it possible to assess the rigidity of the slab-pile foundation that is needed to solve the problems of the multiplicity of piles as well as the problems of distribution of the total load between the piles and the grid.
DOI: 10.22227/1997-0935.2012.3.74 - 78
References
- Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV, 2009, 550 p.
- Ter-Martirosyan Z.G., NguenZang Nam. Vzaimodeystvie svay bol’shoy dliny s neodnorodnym massivom s uchetom nelineynykh i geologicheskikh svoystv gruntov [Interaction between Long Piles and the Heterogeneous Soil Body with the Account for Nonlinear and Rheological Properties of Soils].Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering], 2008, Issue 2, pp. 3—14.
- Ter-Martirosyan Z.G., Trinh Tuan Viet. Vzaimodeystvie odinochnoy dlinoy svai s osnovaniem s uchetom szhimaemosti stvola svai [Interaction between a Single Long Pile and the Bedding with the Account for the Compressibility of the Pile Shaft]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering], Issue 8, 2011, pp. 104—111.