DOI: 10.7256/2453-8922.2023.4.68814

Abstract: The object of study is to assess the state of engineering-geocryological monitoring of geotechnical systems (GTS) of highways in the area of permafrost distribution. The subject of the study is a set of measures to collect, process and accumulate data on road deformations, identify the causes of their occurrence and make decisions to eliminate them. The authors consider in detail such aspects of the topic as the causes of deformations of highway objects in different geocryological conditions. Particular attention is paid to the analysis of various options for obtaining primary information. From the very beginning of operation, highways in the permafrost zone are subject to intense deformations, which resume after repair and restoration work. The main conclusions of the study are: deformations on highways in the permafrost zone are caused by a complex of reasons associated with intense phase transitions of water in rock strata, which fundamentally distinguishes them from similar geosystems formed in more southern regions; engineering and geocryological monitoring of the objects under consideration must be carried out on the basis of interaction between the operating organization, the structure providing scientific support and the center for making management decisions; The existing regulatory framework does not correspond to the problems that arose during the operation of highways in the permafrost zone.

DOI: 10.7256/2453-8922.2018.2.26319

Abstract: This article is devoted to the consideration of issues related to the formation of local zones with signs of dynamic metamorphism in permafrost. Data on the cryogenic formation structures with traces of plastic and discontinuous deformations, as well as signs of flow in a solid, liquid and gaseous form are analyzed. The possibility of using the fluid dynamical approach in the study of dynamic processes in the cryolithozone is considered. The development of the fluid dynamic topic necessitates consideration of non-traditional geocryological objects associated with fluid formations in the cryolithozone. The main attention is given to the structural method associated with the analysis of the features of the cryogenic formations structure and the method of actualism associated with the analysis of the conditions for the fluids formation. In the first part of the article, the paragenetic relationships between the features of the frozen soils formations on the Arctic coasts, the formation of inland water flows and the structural and texture features of the cryogenic formations are considered. A section of marine sediments in the area of the Nei-To lake in Central Yamal was chosen as the research object.

DOI: 10.7256/2453-8922.2018.2.26377

Abstract: The second part of the article is devoted to the consideration of the conditions for the development of two types of fluids in permafrost: frozen soils, and ice flows and gas flows. This work is hampered by the lack of a corresponding conceptual and terminological base, developed classifications, systematized features, differentiation of genetically distinct dynamic formations in frozen soils. In this work, the conceptual fluid dynamics terminology used in geology is analyzed and the possibility of its use in geocryology is considered. The main attention is concentrated on the construction of phenomenological models for the fluids formation in permafrost, supplemented by the structural method and by the method of actualism. The conditions for the development of various types of lithogenous fluids are analyzed: through the formation of a nucleus of rigidity, the motion of frozen soils along the slope, subaquatic landslides, and folding at the lateral surface of growing ice wedges. Based on the analysis of the structure of the gas emission crater (Yamal Crater), the possibility and conditions of gas filtration through icy frozen soils are considered. A mathematical model of the pressure filtration of gas fluids in structurally heterogeneous soils is proposed on the basis of the Brinkman equation applied to the frozen soils.