FOUNDATIONS
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Ground temperature distribution |
Ground temperature distribution |
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Zabolotnik P.S. (2020). Contribution of permafrost scientists to ensuring long-term and trouble-free operation of the Yakutsk CHP Plant. In: Environmental and Infrastructure Integrity in Permafrost Regions: Proceedings of the Russian Conference with International Participation on the Occasion of the 60th Anniversary of the Melnikov Permafrost Institute, Yakutsk (Russia), September 28–30, 2020, pp. 396-399 [in Russian]
Reclaimed Floodplain, Districts 202 and 203
Districts 202 and 203 are housing projects on dredged hydraulic fill in the floodplain of the Lena River. Fill, 8.5-10 m over bars to 12-14 m thick over oxbow lakes, was placed in 1980-1988, with additional earthworks in 1990-1992 and 2012. District 202 was designed and constructed in the 1990s on the principle of maintaining the underlying permafrost in its frozen state. However, geothermal observations conducted by MPI from 2009 to 2015 showed that foundation soils were unfrozen down to depths of 10–15 m over much of District 2020 due to the combined effects of natural and anthropogenic factors (leaks from water supply and wastewater lines, percolation of rain and melt water, complex groundwater processes, hydraulic connection with the river, warming effect of the fill mass, and freeze-thaw-induced changes in mechanical and strength properties of the fill material). Buildings in the neighboring development, District 203 (construction began in 2014), are designed to allow thawing in the foundation. MPI continues geothermal and hydrogeological monitoring in several boreholes instrumented in 2014-2015 in District 203.
District 203 development model.
Subsurface conditions in District 203 in 2019 showing areas of
(1) active-layer water, (2) 10-15 m taliks, (3) 15-20 m taliks, (3) >20 m taliks, (5) borehole, (6) floodplain boundary.
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Pavlova N., Ogonerov V., Danzanova M., Popov V. (2020). Hydrogeology of reclaimed floodplain in a permafrost area, Yakutsk, Russia. Geosciences, 10 (5), art. no. 192, DOI: 10.3390/geosciences10050192
Zhang R.V., Pavlova N.A., Ogоnerov V.V., Lobanov A.L., Zabolotnik P.S., Danzanova M.V. (2020). Civil construction on low floodplains in permafrost region. In: Environmental and Infrastructure Integrity in Permafrost Regions: Proceedings of the Russian Conference with International Participation on the Occasion of the 60th Anniversary of the Melnikov Permafrost Institute, Yakutsk (Russia), September 28–30, 2020, pp. 440-444 [in Russian]