Thermal state of ice-rich soils on the Tommot-Yakutsk
Railroad right-of-way |
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Authors: | Pavel Skryabin |
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Institution: | Melnikov Permafrost Institute, Siberian Branch of the Russian Academy of Sciences, Yakutsk 677010, Russia |
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Abstract: | This paper summarizes the results of investigations carried out in the northern section of the Tommot-Yakutsk Railroad in
eastern Siberia, underlain by ice-rich permafrost. The ongoing permafrost and geotechnical research program in support of
railroad construction includes assessment of the ground thermal state on the right-of-way and adjacent areas based on
long-term field observations using the method of terrain thermal physics. These studies focus on the upper permafrost
within the depth of annual temperature variation. In undisturbed areas, inter-annual variability of the ground thermal state
shows little response to recent climatic variations. However, forest clearing and surface disturbance during right-of-way
construction cause an increase in permafrost temperature, deepening of the active layer, thaw settlement, and water accumulation
along the embankment. The active layer is thickest along the sun-exposed left berm and is thinnest along the
more shaded right berm. Measures to prevent thaw-related embankment problems are recommended. |
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Keywords: | railroad right-of-way temperature thaw depth dynamics permafrost |
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