INTERACTION BETWEEN LONG PILES AND THE SOIL BODY EXPOSED TO NON-LINEAR DEFORMATIONS

Vestnik MGSU 4/2012
  • Telichenko Valeriy Ivanovich - Moscow State University of Civil Engineering (MSUCE) Doctor of Technical Sciences, Professor, Rector, +7 (495) 651-81-85, ext. 2482, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Ter-Martirosyan Zaven Grigor'evich - Moscow State University of Civil Engineering (MSUCE) +7 (499) 261-59-88, Doctor of Technical Sciences, Professor, Chair, Department of Soil Mechanics, Beddings and Foundations, Moscow State University of Civil Engineering (MSUCE), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 22 - 27

Theoretical and numeral solutions to the problem of interaction between a long pile and the heterogeneous soil body are considered in the article. It has been discovered that the distribution of stresses between bottom and side sections of a pile depends on elastic and plastic properties of soils and the pile length-to-diameter ratio. Optimal geometric parameters of a pile can be derived by means of the optimal stress distribution between side and bottom sections of a pile.

The problem of interaction between a long pile and the soil body (the half-space) may be reduced to the problem of interaction between the soil body and the cylinder that has limited dimensions, namely, the diameter of and the height of where is the length of a pile. Solution to the problem in question (section 3) was also obtained through the employment of the method of finite elements (FEM) implemented in the Plaxis-2D software in the elastic and plastic environment. The graphic representation of the solution is provided in Figure 3. As expected, the results generated by analytical and numerical methods are similar both in terms of pile settlement, and in terms of stresses below the bottom end of a pile.

DOI: 10.22227/1997-0935.2012.4.22 - 27

References
  1. Timoshenko S.P., Gud'er Dzh. Teoriya uprugosti [Theory of Elasticity]. Moscow, Nauka Publ., 1975, 575 p.
  2. Ter-Martirosyan Z.G., Nguen Zang Nam. Vzaimodeystvie svay bol'shoy dliny s neodnorodnym massivom gruntov [Interaction between Long Piles and Heterogeneous Soil Body]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2008, no. 2, pp. 3—14.
  3. Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 550 p.

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Interaction of anchors and the surrounding soil with accountfor elastic-plastic properties

Vestnik MGSU 7/2015
  • Ter-Martirosyan Zaven Grigor’evich - Moscow State University of Civil Engineering (National Research University) (MGSU) Doctor of Technical Science, Professor of the Department of Soil Mechanics and Geotechnics, Main Researcher at the Research and Education Center “Geotechnics”, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Avanesov Vadim Sergeevich - Moscow State University of Civil Engineering (MGSU) postgraduate student, Department of Soil Mechanics and Geotechnics, Moscow State University of Civil Engineering (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; +7 (495) 287-49-14 (ext. 14-25); This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 47-56

In this paper the problem of interaction between grouted anchor and the surrounding soil body with account for its elastic-plastic properties is solved by analytical and numerical methods. Tensile loads are exerted on a grouted anchor placed in homogeneous soil body. Under ultimate loads occurs the failure of the system “anchor-surrounding soil”. This research is based on the elastic-plastic model designed by Timoshenko. The problem of interaction between grouted anchor and the surrounding soil is solved in various design conditions, such as constant structural shear strength, account for anchor stiffness, linear variable structural shear strength. The solutions of these problems can be used for quantitative estimation of the stress-strain state of the system. This estimation makes it possible to calculate the displacements of anchors and their bearing capacity. It is shown that displacements significantly depend on physico-mechanical properties of the surrounding soil, geometrical properties of the anchor, selection of design model. The analysis demonstrates that load-displacement curve has clear nonlinearity and unrestrictedly increases at approaching the ultimate stress. The account for anchor stiffness insignificantly influences the obtained solutions and account for it may be neglected. The obtained equations also show that the displacement of the anchor increases with widening of the diameter at constant dimensional ratio of the cylindrical model. It is demonstrated that the ultimate uplift capacity is dependent on the dimensions of anchors and physico-mechanical properties of soil. Analytical solutions are compared to the results of the Finite Element Analysis (FEA) in the computer program Plaxis. The comparison of analytical and numerical solutions has close precision for the magnitude of anchor displacement and ultimate loads.

DOI: 10.22227/1997-0935.2015.7.47-56

References
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