INTERACTION OF A LONG SINGLE PILE THAT HAS A DOUBLE-LAYER BASE WITH ACCOUNT FOR COMPRESSIBILITY OF THE PILE SHAFT

Vestnik MGSU 4/2012
  • 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; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • 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; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 28 - 34

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
  1. Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 550 p.
  2. 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.
  3. 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.
  4. 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.
  5. 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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INFLUENCE OF THE SATURATION PERCENTAGE OF THE CLAY-BEARING SOIL ON ITS STRESS-STRAIN STATE

Vestnik MGSU 8/2012
  • Ter-Martirosyan Zaven Grigorevich - Moscow State University of Civil Engineering Doctor of Technical Sciences, Professor, Distinguished Scholar of the Russian Federation, Chair, Department of Mechanics of Soils, Beddings and Foundations 8 (495) 287-49-14, ext. 1425, Moscow State University of Civil Engineering, 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Nguyen Huy Hiep Huy Hiep - Moscow State University of Civil Engineering postgraduate student, Department of Mechanics of Soils, Beddings and Foundations, Moscow State University of Civil Engineering, 26, YaroslavskoeShosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 112 - 120

The authors propose new analytical and numerical solutions to develop an advanced method
of assessment of the stress-strain state of unsaturated clay soils exposed to external loading.
The research findings demonstrate that the stress-strain state of the soil exposed to distributed
loading in the half-space b = 2a is complex and homogeneous. It depends on the percentage of saturation and on the excessive pore pressure based on the saturation percentage. At the interim
stage, when the pore water is squeezed towards drainage borders, the area that has a maximal
pore pressure in its centre, travels downwards. Consequently, the alteration of excessive pore pressure
in the course of time is dramatic in layers of soil between drainage surfaces. This finding was
obtained through the employment of analytical and numerical solutions.
It is noteworthy that the diagram of stress distribution ƒ = (ƒ1+ƒ2+ƒ3)/3 and z alongside z axis
below strip b = 2a demonstrates damping. This is the reason why the strip exposed to loading and
excessive pressure is limited in its dimensions. Besides, the authors have proven that the surface
soil settlement is caused by shear and 3-dimensional deformations of the soil exposed to the loading
alongside b = 2a strip. Therefore, s = sg + sv, and any settlement increase sg doesn't depend on the
excessive pore pressure, as it occurs concurrently with loading.

DOI: 10.22227/1997-0935.2012.8.112 - 120

References
  1. Ter-Martirosyan Z.G. Mekhanika gruntov [Soil Mechanics]. Moscow, ASV Publ., 2009, 550 p.
  2. Florin V.A. Osnovy mekhaniki gruntov [Soil Mechanics]. Moscow-Leningrad, Stroyizdat Publ., 1959, vol. 1.
  3. Florin V.A. Osnovy mekhaniki gruntov [Soil Mechanics]. Moscow-Leningrad, Stroyizdat Publ., 1961, vol. 2.
  4. Alla Sat Mukhamet Abdul Malek. Napryazhenno-deformirovannoe sostoyaniye preobrazovannogo osnovaniya fundamentov [Stress-strain State of the Transformed Bedding of Foundations]. Moscow, MGSU, 2009.
  5. SNIP 2.02.01—83*. Osnovaniya zdaniy i sooruzheniy [Construction Norms and Rules 2.02.01—83*. Beddings of Buldings and Structures]. Moscow, 1985.
  6. Timoshenko S.N., Gud’er D.Zh. Teoriya uprugosti [Theory of Elasticity]. Moscow, Nedra Publ., 1975, 575 p.
  7. Ivanov P.L. Grunty i osnovaniya gidrotekhnicheskikh sooruzheniy [Soils and Beddings of Hydraulic Engineering Structures]. Moscow, Vyssh. Shk. Publ., 1985, 345 p.
  8. Tsytovich N.A. Mekhanika grutov [Soil Mechanics]. Moscow, Stroyizdat Publ., 1963, 636 p.
  9. Tsytovich N.A. Mekhanika grutov [Soil Mechanics]. Concise Course. Moscow, Vyssh. Shk. Publ., 1979, 268 p.
  10. Tikhonov A.N., Samarskiy A.A. Urovneniya matematicheskoy fi ziki [Equations of Mathematical Physics]. Moscow, Nauka Publ., 1996, 724 p.
  11. Ter-Martirosyan A.Z. Vzaimodeystvie fundamentov s osnovaniem pri tsiklicheskikh i vibratsionnykh vozdeystviyakh s uchetom reologicheskikh svoystv gruntov [Interaction between the Bedding and the Foundation under Cyclic and Vibration Impacts with Account for Rheological Properties of Soils]. Moscow, MGSU, 2010.
  12. Fadev A.B. Metod konechnykh elementov v geomekhanike [Finite Element Method in Geomechanics]. Moscow, Mir Publ., 1989.

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