ИСТИНА

1Lomonosov Moscow State University, Russian Federation; 2“Gazprom Dobycha Yamburg” Engineer Technical Center “Yamburg permafrost laboratory” Yamburg gas condensate field (YGCF) is one of the largest in the world. It is located on the Taz Peninsula in the Yamalo-Nenets Autonomous District (Russia). The development of the gas condensate field was initiated in 1986. The proven initial gas reserves are estimated to be 6.9 trillion cubic meters. It ranks YGCF the fifth in the world. The local natural conditions are featured with the subarctic climate, typical of tundra landscapes on sandy, fine-grained and medium-grained sediments. YGCF is located in the area of continuous permafrost, it is featured with the widespread development of thermal erosion, thermokarst, cryogenic heaving, and frost cracking. The average values of ground temperatures vary spatially from 0°C (for floodplains, under bushes) to -5…-7 °C (for peat bogs) due to the changes in landscape conditions. During the rapid and intense development 25-30 years ago, permafrost conditions have been affected by various engineering constructions (buildings and infrastructure). The technogenic impact resulted in changes of the ground temperatures as well as in the radical changes of the physical, chemical, and mechanical properties of those. The technogenesis induced geocryological changes is a leading factor, causing the reduction of the bearing capacity of engineering structures, and they lead to the development of deformation, buckling of the supports of linear objects and to the development of taliks. In order to assess the impact of the engineering structures on the environment, we identified and evaluated the following parameters: influence on the underlying surface, the intensity of the impact of buildings on the ground, the area of contact and the duration of exposure. The research findings show, that the permafrost feedback due to the impacts of various engineering objects showed an uneven spatial distribution.