Evaluation of frost heaving in frozen foundation layers due to the transfer of water in a gaseous statе
Evaluation of frost heaving in frozen foundation layers due to the transfer of water in a gaseous statе
The redistribution of moisture during uniaxial freezing of the soil at the base of roads in winter is of great importance for its bearing capacity during the spring thaw. In winter, an ice lens forms directly under the road due to the higher thermal conductivity of the pavement layers. And during the spring thaw, the base of the road may become oversaturated, leading to volume changes and damage to the road structure. This article presents a theoretical calculation of moisture accumulation in frozen layers due to water migration in a gaseous state based on monitoring data. A section of the highway near Kosshy town 20 km from the capital of Kazakhstan, was monitored in the winter period of 2021-22 and 2022- 23. The water mass transfer in a form of vapour 1.41-1.44·10⁻⁴ g/h per 1 dm³ of soil at with temperature fluctuations -5-8 °C based on monitoring data of the highway foundations in winter period. The rate of vapour transfer in the frozen soil was 0.467-0.472 m/h and caused the formation of 430-456 g of ice due to the accumulation of water in a gaseous state in every 1 m3 of soil, which increased the humidity by 40% or more and significantly reduced the bearing road capacity during the spring thaw.
Assel Sarsembayeva; PH. E. F. Collins; S. Mussakhanova
18th European Conference on Soil Mechanics and Geotechnical Engineering (ECSMGE2024)
E - Environment, water and energy
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