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The building of constructions in northern regions of the Far East is always connected with a high degree of seasonal freezing risk. This especially refers to a line transport structures which require a high level of reliability and responsibility. Such structures should provide permissible deformability and bearing capacity of the bases when exposed to promising moving loads in difficult geological and climatic conditions.The article discusses the study of the foundations of bored foundations of bridges using methods of mathematical modeling and geosynthetic materials. The study used standard and numerical calculation methods to determine the rational parameters of structural elements and the degree of their operational reliability and durability. In determining the behavior of structures as a whole with the joint interaction of their individual elements with each other, nonlinear models of the soil of the base of the structures were used. Numerical modeling of bored foundations in an elasto-plastic soil mass allowed us to develop effective structural solutions to reduce the deformability of the bridge and increase the bearing capacity of the pile foundation due to reinforcing measures during the construction of the grillage and the creation of rational parameters of the structure as a whole.One of the rational solutions for the main issues which is connected with a construction of facilities in the areas with complex geological and climatic conditions is reasonable usage of modern geosynthetic material properties. Such materials are capable of providing long-term stable operation of facilities made of local building materials. So, the properties of such geosynthetics materials must fully comply with the demands of conditions of their work in the structures and provide a long lifespan as well as high quality.

Study of the stress-strain state of reinforced geosynthetic material or the foundation of the bored foundation of the bridge