Monitoring of highways structures of Nur-Sultan city in winter conditions

Abstract

The article analyzes the physical and mechanical properties of foundation soils on a section of a highway in the geo-climatic conditions of the city of Nur-Sultan. Soil samples of the subgrade were taken in winter to determine the density, moisture, and plastic characteristics of soils in laboratory conditions. Strength and deformation characteristics were determined by compression and shear tests. At the same time, temperature monitoring in winter was carried out by installing sensors in the layers of pavement and subgrade of the highway. The authors analyzed the depth of freezing in winter and the distribution of temperature in the depth of the pavement and base soils. It has been established that the pavement layers remain in a stably frozen state with short-term temperature rises to +6.6 °C due to heat subcompensation (heat transfer) of the underlying layers and have a sufficient margin of safety. And layers to a depth of 25 cm from the surface of the road surface are exposed to the greatest temperature effects.