Optimization of capital costs for pile foundations during construction of oil and gas production facilities on permafrost soils
UDK: 338.45:69:622.276
DOI: 10.24887/0028-2448-2019-11-46-49
Key words: comparison of options for the construction of foundations, design of foundations on permafrost soils, soil thermal stabilizers
Authors: N.G. Gilev (Rosneft-NTC, RF, Krasnodar), E.V. Zenkov (Rosneft-NTC, RF, Krasnodar), U.S. Poverenniy (Rosneft-NTC, RF, Krasnodar), A.D. Dubrov (Rosneft-NTC, RF, Krasnodar), D.A. Kuzmin (Rosneft-NTC, RF, Krasnodar), A.S. Melentev (Rosneft-NTC, RF, Krasnodar), V.A. Pavlov (Rosneft Oil Company, RF, Moscow), N.N. Berdnikov (Rosneft Oil Company, RF, Moscow)
The problem of finding optimal and economically
justified solutions for pile foundations during construction of oil and gas
production facilities on permafrost soils is becoming increasingly urgent in
connection with the development of fields in Western and Eastern Siberia.
Taking into account requirements of the specifications and technical
documentation and also experience of design the bases are applied mainly pile
with a high grillage, as much as possible limiting transfer of heat from constructions
in their basis. In this article we considered the applied technique of
technical and economic comparison of versions of the device of the pile
foundations constructed according the 1 principle of Construction Standards and
Regulations 25.13330.2012 when saving soil of the basis in a frozen status in
the course of construction and during the entire period of operation of a
construction. When defrosting frozen soil loses the integrity, structure and
strength properties, there is an uneven draft, watering and further development
of negative cryogenic processes. A solution is presented for a technical and
economic comparison of the options for installing pile foundations with and
without soil thermal stabilization (STS) systems directly at a design stage of
the bases. Application of soil thermal stabilization, allows to reduce
considerably length and (or) diameter of piles, and sometimes even to reduce
quantity of piles in a grillage when saving necessary bearing capacity of
piles. At the same time application of STS is not always reasonable since
reduction of length of piles at the STS installation can be insignificant while
application of the cooling systems demands additional capital expenditure and
increases duration of installation and construction works. The right choice
will provide not only economic effect, but also will ensure reliability and
safety of operation of designed projects.
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