Arrangement of capillary barrier made of injected solution to prevent subgrade frost heaving

Abstract

The problem of road pavement deterioration due to the forces of frost heave on operating roads remains highly relevant for many regions of Russia.One of the effective methods for regulating the magnitude of frost heave in the roadbed of highways under unfavorable soil-climatic conditions is the installation of a capillary barrier. This method, using injection methods for soil transformation, has been previously justified by the authors based on field and laboratory research.However, for practical implementation of the proposed method, the key unresolved research tasks are the determination of the calculated depth of the capillary barrier within the roadbed and its optimal thickness.In this regard, the aim of the research is to provide a calculated justification for the boundaries of the capillary barrier made from injected solution to prevent frost heave in the roadbed.The methodological basis of the study includes theoretical research methods such as abstraction, analysis, and synthesis.The article formulates the condition for transitioning from an "open" freezing system to a "closed" system and proposes criteria for creating a capillary barrier. A solution is obtained to determine the maximum thickness of the capillary barrier, which depends on the properties of its material and the coefficient of moisture conductivity. The solution to the problem of locating the capillary barrier within the structure of the operating roadbed is presented, based on correlating the zone of intensive moisture transfer with the isotherms of temperatures in the freezing massif.