Open AccessACCOUNTING OF SOLAR RADIATION IN NUMERICAL MODELLING OF THE THERMOPHYSICAL PROCESSES OF FREEZING AND THAWING OF PERMAFROST SOILS
Author(s) -
Sergey Kudryavtsev,
Кудрявцев С. А,
Tatiana Valtseva,
Вальцева Т. Ю,
A. V Kajarskii,
Кажарский А. В,
J. I Kotenko,
Котенко Ж. И,
Vladimir Paramonov,
Парамонов В. Н,
И. И. Сахаров,
Сахаров И. И
Publication year - 2020
Publication title -
construction and geotechnics
Language(s) - English
Resource type - Journals
eISSN - 2687-0908
pISSN - 2687-0894
DOI - 10.15593/2224-9826/2020.4.02
Subject(s) - permafrost , environmental science , zoning , soil water , geology , hydrology (agriculture) , geotechnical engineering , soil science , oceanography , political science , law
The article considers options for stabilizing the thawing process of permafrost soil of railways during the reconstruction period. The analysis of the engineering and geological conditions made it possible to design rock cooling structures at this facility, which are berms and cover slopes of the subgrade with fractionated rocky soil. The technical characteristics of fractionated rock soil structures have been developed and tested in this cryological area and have shown their effective operation for more than 30 years. As a result of the operation of the railway embankment, permafrost degrades and its boundary is at different depths depending on local conditions and the condition of the drainage systems from the subgrade. The position of the upper permafrost boundary should be established during surveys, if it is not advisable to restore the frozen base to a depth of 10 m, it is necessary to strengthen the thawed weak base and create conditions for the consolidation of thawed soils. Geographic latitude determines zoning in the distribution of climate elements. Solar radiation enters the upper boundary of the atmosphere, depending on geographic latitude. It determines the midday height of the Sun and the duration of the radiation. The absorbed radiation is distributed more difficultly, since it depends on cloud cover, the albedo of the earth's surface, and the degree of transparency of the air. Zoning also underlies the distribution of air temperature. The temperature depends not only on the absorbed radiation, but also on the circulating conditions. Zoning in the temperature distribution leads to zoning of other meteorological climate values. The influence of geographical latitude on the distribution of meteorological values becomes more noticeable with height when the influence of other climate factors associated with the earth's surface weakens.