DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

NUMERICAL CALCULATIONS IN GEOMECHANICS APPLICABLE TO LINEAR STRUCTURES

Vestnik MGSU 3/2012
  • Vlasov Alexander Nikolaevich - Institute of Applied Mechanics of the Russian Academy of Sciences (IAM RAS) Sergeev Institute of Environmental Geoscience of the Russian Academy of Sciences (IEG RAS) Doctor of Sciences, Principal Researcher Principal Researcher phone: 8 (495) 523-81-92, Institute of Applied Mechanics of the Russian Academy of Sciences (IAM RAS) Sergeev Institute of Environmental Geoscience of the Russian Academy of Sciences (IEG RAS), 32а Leninskij prospekt, Moscow, 119334, Russia Building 2, 13 Ulansky pereulok, 101000, Moscow, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Volkov-Bogorodskiy Dmitriy Borisovich - Institute of Applied Mechanics of the Russian Academy of Sciences (IAM RAS) Candidate of Physics and Mathematics, Senior Researcher 8 (499) 160-42-82, Institute of Applied Mechanics of the Russian Academy of Sciences (IAM RAS), 32а Leninskiy prospekt, Moscow, 119334, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
  • Znamenskiy Vladimir Valerianovich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Professor, Department of Soil Mechanics, Beddings and Foundations, 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 .
  • Mnushkin Mihail Grigor'evich - Sergeev Institute of Environmental Geoscience Russian Academy of Sciences (IEG RAS) Candidate of Technical Sciences, Principal Researcher, Sergeev Institute of Environmental Geoscience Russian Academy of Sciences (IEG RAS), Building 2, 13 Ulansky pereulok, 101000, Moscow, Russia; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 35 - 42

The article covers the problem of applicability of finite-element and engineering methods to the development of a model of interaction between pipeline structures and the environment in the complex conditions with a view to the simulation and projection of exogenous geological processes, trustworthy assessment of their impacts on the pipeline, and the testing of varied calculation methodologies. Pipelining in the areas that have a severe continental climate and permafrost soils is accompanied by cryogenic and exogenous processes and developments. It may also involve the development of karst and/or thermokarst. The adverse effect of the natural environment is intensified by the anthropogenic impact produced onto the natural state of the area, causing destruction of forests and other vegetation, changing the ratio of soils in the course of the site planning, changing the conditions that impact the surface and underground waters, and causing the thawing of the bedding in the course of the energy carrier pumping, etc.
The aforementioned consequences are not covered by effective regulatory documents. The latter constitute general and incomplete recommendations in this respect. The appropriate mathematical description of physical processes in complex heterogeneous environments is a separate task to be addressed. The failure to consider the above consequences has repeatedly caused both minor damages (denudation of the pipeline, insulation stripping) and substantial accidents; the rectification of their consequences was utterly expensive. Pipelining produces a thermal impact on the environment; it may alter the mechanical properties of soils and de-frost the clay.
The stress of the pipeline is one of the principal factors that determines its strength and safety. The pipeline stress exposure caused by loads and impacts (self-weight, internal pressure, etc.) may be calculated in advance, and the accuracy of these calculations is sufficient for practical implementation. Stress and strain caused by other factors (groundwater supports, anchors, fixing elements) may only be identified on location. The impact of other factors (temperature, permafrost thawing, karst phenomena and landslides, etc.) may be identified as approximate values.

DOI: 10.22227/1997-0935.2012.3.35 - 42

References
  1. Mnushkin M.G., Vlasov A.N., Znamenskiy V.V., Volkov-Bogorodskiy D.B. Chislennoe modelirovanie zadach geomekhaniki s ispol’zovaniem programmy UWay [Numerical Modeling of Geomechanical Problems through the Application of UWay Software]. Chislennye metody raschetov v prakticheskoy geotekhnike [Numerical Methods of Calculations in Practical Geotechnics]. Collected works of scientific and practical conference, St. Petersburg, SPbGASU, 2012, pp. 203—209.
  2. Vlasov A.N., Savatorova V.L., Talonov A.V. Opisanie fizicheskikh protsessov v strukturno neodnorodnykh sredakh [Description of Physcial Processes in Heterogeneous Media]. Moscow, RUDN, 2009,258 p.
  3. Tsytovich N.A. Mekhanika gruntov [Soil Mechanics]. Moscow, Gosstroyizdat, 1963, 636 p.
  4. Drukker D., Prager V. Mekhanika gruntov i plasticheskiy analiz ili predel’noe proektirovanie. Opredelyayushchie zakony mekhaniki gruntov [Soil Mechanics and Practical Analysis or Limit State Design. Determinative Laws of the Soil Mechanics]. Moscow, Mir, 1975, pp. 166—177.

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Fresh approach to karst management in designing submerged pipeline crossings over large transit rivers

Vestnik MGSU 11/2016
  • Makhnatov Stanislav Anatol’evich - OJSC Research Institute Project “Territorial Workshop no. 17” (NII PTM no. 17); Moscow State University of Civil Engineering (National Research University) head, Department of Karst Investigations; Assistant Lecturer, Department of Engineering Geology and Geoecology, OJSC Research Institute Project “Territorial Workshop no. 17” (NII PTM no. 17); Moscow State University of Civil Engineering (National Research University), 3 Kostina str., business center «Novaya ploshchad’», Nizhniy Novgorod, 603057, Russian Federation; 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 32-47

It has been known that the use of karst stability categories classified by sinking diameter and the rate of its occurrence creates contradictions between researchers and designers. These contradictions are most discernable when implementing special projects such as construction of linear objects. The article provides an example of risk management when placing linear objects on karsted territories as exemplified by trunk line submerged crossings in a valley of a large transit river. The conditions of the regional karst development were identified, as well as the features determining sink risk. The authors provide the factual material analysis using the concepts that describe the reasons for the formation sink mechanism. The risk assessment is carried out during the analysis of necessary and sufficient conditions for the occurrence of sink mechanisms forming the karst hazard. The research results showed that the seasonal variations influence the possibility of karst risk. It is proposed to use an algorithm of karst management based on the variability approach, taking into account the changes in environmental conditions that affect the essence of the danger existence.

DOI: 10.22227/1997-0935.2016.11.32-47

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Engineering-geological or geoecological processes and phenomena; their development in the present-day environment

Vestnik MGSU 9/2012
  • Potapov Aleksandr Dmitrievich - Moscow State University of Civil Engineering (MGSU) Doctor of Technical Sciences, Professor, Head, Department of Engineering Geology and Geoecology, 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 .
  • Potapov Ivan Aleksandrovich - Scientific and Research Institute of Emergency Healthcare named after N.V. Sklifosovskiy engineer, Scientific and Research Institute of Emergency Healthcare named after N.V. Sklifosovskiy, ; This e-mail address is being protected from spambots. You need JavaScript enabled to view it .

Pages 191 - 196

The authors consider theoretical issues of the present-day interpretation and applicability of
the terms and concepts of the engineering geology and geoecology. The authors propose a new
approach to the formulation of definitions of the founding concepts of major categories of the engineering
geodynamics as the constituent part of the engineering geology. At the current stage of
development of the geoecology, the processes and phenomena typical for the geological environment
considered from the viewpoint of civil engineering are regarded as geoecological rather than
engineering and geological.
Examples of incorrect interpretation of these concepts of engineering geology replace the
study of the processes and phenomena of the engineering geology by the study of exogenous
processes in the upper zone of the earth crust. Negative processes underway in the geological environment
that are considered within the framework of the engineering geology should be assessed
as geoecological. The assessment of the present-day use of the term "geoecological processes and
phenomena" is based on the principle of indecomposability and unity of the geosphere. This fact
serves as the basis for the modern interpretation of concepts of engineering geology or geoecology
that relate to the geological environment and its use as the setting of construction works.
The authors demonstrate that the pollution of the atmospheric air or its transparency affect
structures. It causes changes in the hydrogeological conditions that may cause a flood or reduction
of the level of underground waters that influence the behaviour of bases of constructions.
Anthropogenic impacts that cause the temperature and chemical pollution of the subterranean hydrosphere
can lead to the dissolution of rocks, trigger karst processes, boost the speed of underground
waters, and, thus, trigger the mechanical suffosion in the sands. The concept of geoecological
processes and phenomena as the basic categories needs the assessment of the geological
environment when exposed to the anthropogenic impact.

DOI: 10.22227/1997-0935.2012.9.191 - 196

References
  1. Kamenskiy G.N., Korchebokov N.A., Razin K.I. Dvizhenie podzemnykh vod v neodnorodnykh plastakh [Motion of Subterranean Waters inside Heterogeneous Strata]. Moscow, Soedinennoe nauchno-tekhnicheskoe izd-vo publ., 1935.
  2. Anan’ev V.P., Potapov A.D. Inzhenernaya geologiya [Engineering Geology]. Moscow, Vysshaya shkola publ., 2009.
  3. Norint S.A. Bol’shoy tolkovyy slovar’ russkogo yazyka [Big Explanatory Dictionary of the Russian Language]. St.Petersburg, 1998.
  4. Mirkin B.M. Terminy i opredeleniya po okhrane okruzhayushchey sredy, prirodopol’zovaniyu i ekologicheskoy bezopasnosti [Terms and Defi nitions Relating to Environmental Protection, Use of Natural Resources and Environmental Safety]. St.Petersburg, SPbGU Publ., 2001.
  5. Savchenko V.N., Smagin V.P. Nachala sovremennogo estestvoznaniya [Basics of Contemporary Natural Science]. Rostov-on-Don, Tezaurus Publ., 2006.
  6. Slovar’ terminov chrezvychaynykh situatsiy [Dictionary of Emergency Terms]. Moscow, Ministry of Emergencies Management Publ., 2010.
  7. Potapov A.D. Ekologiya [Ecology] Moscow, Vysshaya shkola Publ., 2005.
  8. Korolev V.A. Ochistka gruntov ot zagryazneniy [Decontamination of Soil]. Moscow, MAIK Nauka/Interperiodika Publ., 2001.
  9. Potapov I.A., Shimenkova A.A., Potapov A.D. Zavisimost’ suffozionnoy ustoychivosti peschanykh gruntov razlichnogo genezisa ot tipa fil’trata [Dependence of Suffosion Stability of Sandy Soils of Various Geneses on the Type of Filtrate]. Vestnik MGSU [Proceedings of Moscow State University of Civil Engineering]. 2012, no. 5, pp. 79—86.

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