ABSTRACT
The article describes measures to reduce critical deformations at an accident cluster of the Salekhard–Nadym motor road. At local sections of the road under consideration, deformations and defects affecting its transport and operational performance manifest themselves annually. During development of design solutions, at the road section under consideration, local zones characterized by complex geocryological processes and phenomena occurring at the base were not considered, which resulted in critical cyclic deformations of the road bed during seasonal freezing and thawing. At the experimental section of the operating motor road, on the slope of the road bed, on the side of the permafrost base, a thrust soil roll made of non-frost-susceptible mineral soil is formed, which is bordered by a reinforcing geosynthetic material placed under the slope of the road base and a part of the slope of the road bed, forming a semi-holder with fixation of the lower edges in the permafrost soil column. To prevent thawing of permafrost base soils, Seasonal Cooling Devices (SCD) are installed. As a result of design solution construction, time between road surface repairs as well vertical and horizontal deformations of the road surface, road bed, and base soils decrease. Results of numerical simulation for operation of SCDs installed at the accident cluster are presented. A comparison of the numerical solution with the field data is provided.
