Influence of soil salinity on the bearing capacity of the frozen wall
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https://orcid.org/0000-0001-5200-7931
Lev Levin
Mining Institute of the Ural Branch of the Russian Academy of Sciences, Perm, Russia
Sergey Bublik
Mining Institute of the Ural Branch of the Russian Academy of Sciences, Perm, Russia
https://orcid.org/0000-0002-2084-0002
Andrey Brovka
Institute of Natural Resources Management of the National Academy of Sciences, Minsk, Belarus
Ivan Dedyulya
Institute of Natural Resources Management of the National Academy of Sciences, Minsk, Belarus
Abstract
The article describes the results of laboratory studies on the unfrozen water content and ultimate long-term strength of frozen clay and chalk samples in the temperature range from −10 to −25 °C. The soil samples contained dissolved salt in the pore space, with three types of salts (NaCl, KCl, and CaCl2) being considered. The findings indicate that the influence of the content and type of dissolved salt on the ultimate long-term strength of soils is realized indirectly through the unfrozen water content. In this case, the soil freezing characteristic curve in the region of negative temperatures significantly depends on both the type of dissolved salt and its quantity. The experimental data obtained were used to parameterize the model and calculate the maximum bearing capacity of the frozen wall (FW) in the presence of dissolved salts in the volume of frozen soils. It has been demonstrated that the decrease in the maximum FW bearing capacity is substantial with the appearance of dissolved salt in the pore space of the soils. This decrease is at-tributed to the combined effects of two factors: 1) a reduction in the FW thickness and 2) a decrease in the frozen soil strength due to an increase in the amount of unfrozen water content in the soil pore space. The second factor is deemed more significant.
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