Civil construction on low floodplains in permafrost regions: experience, problems, prospects

The experience of inwashed soil development under the conditions of permafrost is considered for various engineering structures: the foundations of gas-oil, industrial and civil facilities, soil hydraulic facilities, roads, etc. Particular attention is paid to the technology of construction of the foundation of inwashed soil on the low floodplain of the Lena river for the residential complex of the Yakutsk city (quarters No. 202 and 203). The results of studies into the dynamics of the geocryological conditions over this territory during the long-term operation of buildings and engineering structures are presented. It was revealed that in the major part of the territory of quarter No. 202 in Yakutsk, which was constructed in the 1980–90s according to the 1st principle, at present the ground has a positive temperature at a depth of 10 m and deeper. At the territory of quarter No. 203,, suprapermafrost aquiferous taliks, were formed during hydromechanical works in the 1990s, and they still exist everywhere after 30 years. The factors that contribute to the preservation of suprapermafrost taliks in the body and base of the inwashed soil are considered. The main factors determining the formation of the soil temperature field include distinct thermophysical properties of dry inwashed sands in the upper part of the section and the hydrogeological conditions of the territory. The features and prospects of inwashed soil exploitation as the structure foundations and the principles of construction on them are analyzed. To control and develop robust recommendations for ensuring the sustainability of structures, it is necessary to organize comprehensive geocryological monitoring, including ecological aspects of the interaction between technogenic systems and the environment.

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