Alekseev Andrey
@en.cstroy.ru
Gersevanov Research Institute of Bases and Underground Structures named after N.M. Gersevanov
JSC RESEARCH CENTER OF CONSTRUCTION
RESEARCH INTERESTS
construction
Scopus Publications
Scopus Publications
R. G. Motenko, R. R. Davletova, E. S. Grechishcheva, and A. G. Alekseev
Allerton Press
A. G. Alekseev and S. G. Bezvolev
Springer Science and Business Media LLC
A. G. Alekseev and S. G. Bezvolev
Springer Science and Business Media LLC
A.G. Alekseev, S.G. Bezvolev, and S.A. Vinogradova
CRC Press
A.G. Alekseev, E.S. Grechishcheva, O.V. Kozlova, and R.V. Makhota
CRC Press
Dmitriy Alyavdin, Vladimir Belyakov, Artemiy Levin, Andrey Alekseev, Erika Grechishcheva, Olga Kozlova, and Roman Makhota
MDPI AG
Air temperature in the Northern Hemisphere has been progressively warming in the recent decades, and the ground temperatures have increased correspondingly. The air temperature increasing due to the climate change induces degradation of permafrost and frost heaving activation. The frost heaving forces cause unevenly distributed damaging displacement of foundations and thus poses problems to the development of Arctic regions. Frost-heave uplift forces can be reduced by protecting piles with an OSPTReline (or Reline) polymer heat-shrinkable jacket. The interaction of heaving soil with a pile covered with the Reline jacket is modeled in laboratory to estimate the uplift force and the related shear strength of frozen soil along the soil-pile adfreeze surface at temperatures from −6 to −1 °C. The data are obtained for silty sand and silty clay soils and mortar (1:5 cement-sand mixture). The experiments show that frost-heave uplift forces on Reline-protected piles are 52% to 85% lower than on uncovered steel piles (steel grade 09G2S—analog to European steel grade S355JR), depending on soil type and temperature.
V.P. Melnikov, V.I. Osipov, A.V. Brouchkov, A.G. Alekseev, S.V. Badina, N.M. Berdnikov, S.A. Velikin, D.S. Drozdov, V.A. Dubrovin, M.N. Zheleznyak,et al.
Fund Science and Culture Support Centre
A.G. Alekseev
Fund Science and Culture Support Centre
Vladimir P. Melnikov, Victor I. Osipov, Anatoli V. Brouchkov, Svetlana V. Badina, Marat R. Sadurtdinov, Dmitry S. Drozdov, Galina V. Malkova, Mikhail N. Zheleznyak, Oleg V. Zhdaneev, Nikolay A. Ostarkov,et al.
MDPI AG
This study is an attempt to suggest a new state system of permafrost monitoring, primarily for energetic infrastructure, based on past approaches and achievements in Russia for over a hundred years of Arctic studies. The methodology of this study is based on general theoretical methods of scientific research. Historical (retrospective analysis of the development of the monitoring system of long-term permafrost in Russia) and logical (inductive generalization) methods were applied. The structure and methods of permafrost monitoring in the Soviet Union and new technologies used nowadays to establish permafrost monitoring systems, taking into account modern Arctic energetic development, have been analyzed.
A. G. Alekseev and S. G. Bezvolev
Springer Science and Business Media LLC
Evgeny M. Chuvilin, Boris A. Bukhanov, Aliya Z. Mukhametdinova, Erika S. Grechishcheva, Natalia S. Sokolova, Andrey G. Alekseev, and Vladimir A. Istomin
Elsevier BV
A. G. Alekseev
Springer Science and Business Media LLC
E.V. Zenkov, , V.G. Georgiyadi, N.G. Gilev, Yu.S. Poverenniy, D.Yu. Shestakov, A.A. Popov, V.A. Pavlov, A.G. Alekseev, ,et al.
Oil Industry Corporation
A.G. Alekseev and S.G. Bezvolev
Springer Science and Business Media LLC
A.G. Alekseev
Springer Science and Business Media LLC
A. G. Alekseev and S. G. Bezvolev
Springer Science and Business Media LLC
P. D. Odesskii, Ya. V. Vershinin, A. G. Alekseev, and A. A. Zvezdov
Pleiades Publishing Ltd
A. G. Alekseev, S. G. Bezvolev, and P. M. Sazonov
Springer Science and Business Media LLC
A. G. Alekseev, L. N. Khrustalev, and V. E. Konash
Springer Science and Business Media LLC
Andrey Alekseev and Dmitry Zorin
IOP Publishing
Owing to the current extensive exploration of the continuous permafrost zone which takes up no less than 25% of the entire land area and over 60% of the territory of the Russian Federation, the necessity arises to search for innovative construction technologies in view of bases and foundation engineering carried out in the cryolithozone. The article studies one of such technologies, i.e. the pile foundations built on permafrost employing the cement grout injection into the pre-drilled hole. The article reveals the investigation findings pertaining to the interaction of micropiles with permafrost. The investigation objective is to determine the mechanical and thermophysical properties of interaction for the micropile cement body with permafrost. Within the scope of the investigation presented herein a series of tray tests of the scaled augercast pile models in permafrost was carried out to assess their ability to withstand static pressing loads simultaneously measuring the temperatures in depth, as well as proceeding with the laboratory testing of mechanical and thermophysical properties of the injected cement grout, and thermal engineering calculations to determine the nature of thermal interaction of the micropiles with permafrost. Obtained are the values of the load-bearing capacity of the augercast piles and resistance of frozen non-saline soils to sustain the shear over the adfreeze surface with the cement body of the augercast piles; generated are the graphs of the temperature fluctuations in the course of the cement grout consolidation. The strength values for the cement body of the augercast piles built in permafrost are recorded. The time required to ensure the cement grout hardening to prevent its freezing is estimated; the temperature required for the cement grout used for injection is also determined. In consequence of the investigation, the recommendations are provided with respect to the augercast piles construction in the cryolithozone.
Andrey Alekseev, Gleb Gribovskii, and Svetlana Vinogradova
IOP Publishing
The objective of this research is to determine the most suitable software packages for simulation of thermal effect of various constructions on seasonally frozen or permafrost ground. The abrupt change in soil physical properties at freeze/thaw boundaries is a considerable challenge because it introduces a strong nonlinearity into the heat transfer model. Mathematically speaking, there appears a Stefan condition at the moving boundary of the phase transition. A problem of soil column freezing is considered. The simulation results, obtained by different software, are compared with the analytical solution of the corresponding semi-infinite Stefan problem. The frost penetration depth and the depth profiles of temperature and its absolute error, after 300 days, are presented.
A. G. Alekseev
Springer Science and Business Media LLC