Typification of engineering-geological and geocryological conditions for compiling a numerical forecast of the thermal state of permafrost soils

UDK: 624.139
DOI: 10.24887/0028-2448-2021-7-100-106
Key words: numerical modeling of changes in the temperature field, designing objects on permafrost soils, geotechnical characteristics, geocryological characteristics, field pipelines, main pipelines, high-voltage lines, typification of geotechnical and geocryological conditions
Authors: E.V. Zenkov (NK Rosneft – NTC LLC, RF, Krasnodar), V.G. Georgiyadi (NK Rosneft – NTC LLC, RF, Krasnodar), N.G. Gilev (NK Rosneft – NTC LLC, RF, Krasnodar), Yu.S. Poverenniy (NK Rosneft – NTC LLC, RF, Krasnodar), D.Yu. Shestakov (NK Rosneft – NTC LLC, RF, Krasnodar), A.A. Popov (NK Rosneft – NTC LLC, RF, Krasnodar), V.A. Pavlov (Rosneft Oil Company, RF, Moscow), A.G. Alekseev (NIIOSP, RF, Moscow; Moscow State University of Civil Engineering (National Research University), RF, Moscow)

In order to make economically optimal technical solutions for foundations and foundations, specialists in the field of temperature stabilization of soils must perform predictive heat engineering calculations. In the process of designing long-distance objects (field and main pipelines in the above-ground version, overhead power lines), the number of engineering-geological wells for which it is necessary to perform predictive heat engineering calculations can exceed several hundred pieces. To speed up the design procedure, without losing the accuracy of the results of numerical modeling of the thermal state of permafrost soils of the foundations of structures, allows the typification of engineering-geological and geocryological conditions.

In this article, an algorithm for typing engineering-geological and geocryological conditions is proposed and considered. Based on the results of numerical modeling, the scientific validity of the application of the proposed algorithm has been proved. An analysis of the optimization of working resources is carried out, provided that the algorithm is introduced into the process of designing linear structures for the construction of the surface infrastructure of oil and gas, gas and oil and gas condensate fields in the conditions of the spread of permafrost soils. The algorithm is based on the principle of analyzing the lithological composition, physical-mechanical and thermophysical properties of soils, the initial temperature state of soils (plastic frozen, frozen, solid-frozen, thawed) and the type of section (thawed, continuous, non-melting or buried roof of permafrost soils). According to the results of the analysis, geotechnical wells with similar soil parameters are combined into typical geotechnical conditions for which it is assumed that the dynamics of the temperature field change will be identical. The typification process is an important practical tool for a specialist in the field of predictive heat engineering calculations working with long-distance objects (field and main pipelines, high-voltage power lines). The introduction of automated software algorithms in the design can significantly reduce the time for performing numerical modeling without losing the accuracy of the results.


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