BEDDINGS AND FOUNDATIONS, SUBTERRANEAN STRUCTURES. SOIL MECHANICS

INFLUENCE OF THE STRESS-STRAIN STATE OF THE HOMOGENEOUS SOIL SLOPE ON ITS STABILITY

Vestnik MGSU 12/2012
  • Sainov Mikhail Petrovitch - Moscow State University of Civil Engineering (MGSU) Candidate of Technical Sciences, Associate Professor, Associate Professor, 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 111 - 116

Various methods are used to compare results of stability analyses. A simple design model was considered by the authors, i.e. a slope composed of the homogenous loose soil, for which the assessment may be made by considering the stability of a particle that remains in place due to the sliding frictional force on the slope. In this case, the critical circle method gives approximate results. More accurate results may be obtained by reducing the soil mass using the method of numerical modeling of the stress-strain state. In spite of the fact that there is a deficiency of vertical stresses in its central zone, the slope stability coefficient is close to that obtained by simpler methods. Besides, it is proven that the results of the analysis of the natural (non-restructive) stress-strain state of the soil mass may be used in the stability analysis on the basis of the critical circle method. As for the
estimation of friction forces, it is necessary to calculate normal stresses on the sliding surface with account for all components of the stress tensor.

DOI: 10.22227/1997-0935.2012.12.111 - 116

References
  1. Gol’din A.L., Rasskazov L.N. Proektirovanie gruntovykh plotin [Design of Earth Dams]. Moscow, ASV Publ., 2001, 384 p.
  2. Tertsagi K. Stroitel’naya mekhanika grunta [Structural Mechanics of Soil]. Moscow-Leningrad, Geostroyizdat Publ., 1933, 510 p.
  3. Chugaev R.R. O raschete ustoychivosti zemlyanykh otkosov [Analysis of Stability of Earth Slopes]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1968, no. 2, pp. 26—28.
  4. Chugaev R.R. Zemlyanye gidrotekhnicheskie sooruzheniya [Earth Hydraulic Engineering Structures]. Leningrad, Energiya Publ., 1967, 460 p.
  5. Maslov I.A. Analiticheskiy metod rascheta ustoychivosti otkosov [Analytical Method of Calculation of Stability of Slopes]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1989, no. 12, pp. 9—14.
  6. Istomin V.I. Sootvetstvie raschetnoy skhemy sposobu rascheta koeffi tsienta ustoychivosti [Compliance between the Calculation Pattern and the Method of Calculation of the Coeffi cient of Stability]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1989, no. 12, pp. 17—20.
  7. Bukhartsev V.N. Obshchiy metod rascheta ustoychivosti gruntovykh otkosov v ramkakh ploskoy zadachi [General Method of Analysis of Stability of Earth Slopes within the Framework of a Plane Problem]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1983, no. 11, pp. 28—32.
  8. Bukhartsev V.N., Ivanov A.Yu., Togo I. Opyt ispol’zovaniya variatsionnogo metoda v raschetakh ustoychivosti otkosov i sklonov [Practical Use of the Variational Method in Analyses of Stability of Slopes and Backfalls]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1990, no. 4, pp. 46—48.
  9. Bukhartsev V.N. O nadezhnosti obespecheniya ustoychivosti gruntovykh massivov [Reliability of Stabilization of Soil Massifs]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1990, no. 1, pp. 41—43.
  10. Bate K., Vilson E. Chislennye metody analiza i metod konechnykh elementov [Numerical Methods of Analysis and Finite Element Method]. Moscow, Stroyizdat Publ., 1982, 446 p.
  11. Ivakhov I. Plaxis — geotekhnicheskie raschety [Plaxis: Geotechnical Calculations]. CadMaster, 2002, no. 1, pp. 58—60.
  12. Lombardo V.N., Groshev M.E., Olimpiev D.N. Uchet napryazhenno-deformirovannogo sostoyaniya pri raschetakh ustoychivosti otkosov gruntovykh plotin [Consideration of the Stress-Strained State within the Framework of the Analysis of Stability of Slopes of Earth Dams]. Gidrotekhnicheskoe stroitel’stvo [Hydraulic Engineering Construction]. 1986, no. 7, pp. 16—18.

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COMPARISON OF MECHANICAL PROPERTIES OF THE CLAY STONE OF THE EARLY PERMIAN AGE ACCORDINGTO THE RESULTS OF FIELD AND LABORATORY TESTS

Vestnik MGSU 2/2013
  • Ponomarev Andrey Budimirovich - Perm National Research Polytechnical University (PGTU) +7 (342) 2-198-374, Perm National Research Polytechnical University (PGTU), 29 Komsomol’skiy prospekt, Perm, 614990, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Sychkina Evgeniya Nikolaevna - Perm National Research Polytechnical University (PGTU) +7 (342) 2-198-374, Perm National Research Polytechnical University (PGTU), 29 Komsomol’skiy prospekt, Perm, 614990, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 55-63

The article covers the problem of parameters that underlie the choice of mechanical properties of the clay stone used as the foundation material in Perm. The object of this study is the clay stone of the early Permtric modulus, effective cohesion intercept and angle of internal friction constitute tian age. Mechanical properties, including the deformation modulus, oedomehe subjects of the study. The authors enumerate the following tasks:1) description of geological conditions of the two sites of experiments in Perm,2) development of the methodology of identification of strength and deformation properties of the clay stone in the laboratory (oedometry testing and shear box testing of water saturated and water free samples) and on site (cone penetration tests, pressuremeter tests) according to the Russian technical regulations,3) experiments aimed at identification of mechanical properties of the clay stone,4) analysis and comparison of mechanical properties of the clay stone using various methods,5) provision of conclusions and recommendations concerning mechanical properties of upper layers of the clay stone in Perm.A lot of attention is paid to the analysis of results of cone penetration tests, pressuremeter and laboratory tests. The study has revealed a significant effect of test methods on the resulting values of strength and deformation properties of the local clay stone.

DOI: 10.22227/1997-0935.2013.2.55-63

References
  1. Ponomarev A.B., Zakharov A.V., Sursanov D.N. K voprosu ispol’zovaniya verkhnepermskikh otlozheniy v kachestve gruntovykh osnovaniy [On the Use of Upper Perm Deposits as Foundation Soils]. Vestnik PGTU [Proceedings of Perm State Technical University]. Urbanistika [Urban Planning]. 2011, no. 1, pp. 74—80.
  2. Trofimov V.T., Korolev V.A., Voznesenskiy E.A., Ziangirov R.S. Gruntovedenie [Pedology]. Moscow, MGU Publ., 2005, 1024 p.
  3. Ryzhkov I.B., Isaev O.N. Staticheskoe zondirovanie gruntov [Cone Penetration Testing]. Moscow, ASV Publ., 2010, 496 p.
  4. Sychkina E.N., Ponomarev A.B. K voprosu opredeleniya nachal’nogo napryazhennogo sostoyaniya poluskal’nykh gruntov v laboratornykh usloviyakh [On Identification of the Initial Stress State of the Half Rock in the Laboratory Environment]. Izvestiya vuzov. Stroitel’stvo. [News of Institutions of Higher Education. Civil Engineering.] 2012, no. 6 (642), pp. 74—80.
  5. Otchet ob inzhenerno-geologicheskikh izyskaniyakh na ob”ekte «Zhiloy kompleks s pomeshcheniyami obshchestvennogo naznacheniya, mnogofunktsional’nym zdaniem po ul. Mira, 41 v Industrial’nom rayone g. Permi» (2 ochered’). [Report on Geological Engineering Survey of “Residential Housing Estate That Has Several Public Premises, or a Multi-functional Building located at: 41 Mira St., in the industrial area of Perm (Stage 2)”. VerkhnekamTISIz Publ., Perm, 2012.
  6. Zakharov M.S. Staticheskoe zondirovanie v inzhenernykh izyskaniyakh [Cone Penetration Testing in Engineering Research]. St.Petersburg, SPBGASU Publ., 2007, 72 p.
  7. Akbulyakov M.A., Sychkina E.N., Ponomarev A.B. Metodika opredeleniya predela prochnosti na odnoosnoe szhatie poluskal’nykh gruntov (na primere argillitov g. Permi) [Methodology of Identification of Ultimate Uniaxial Compressive Strength of the Half Rock (Exemplified by the Clay Stone in Perm)]. Mekhanika gruntov v geotekhnike i fundamentostroenii [Soil Mechanics in Geotechnics and Foundation Engineering]. Works of the All-Russian Scientific and Technical Conference. Novocherkassk, YuRGTU (NPI) Publ., 2012, pp. 250—256.

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