Abstract
The technical condition of the railroad track subgrade has been analyzed, as well as the issues related to ensuring its strength and stability when exposed to floodwaters and when the track's sections are overmoistened during operation. As a result, it has been established that it is necessary to develop methods aimed at improving the subgrade's carrying capacity. The georadar research has explored the problematic areas of the railroad track subgrade, based on which the distribution of subgrade heterogeneity in the vertical plane, as well as the boundaries of its location, were established. Therefore, georadar research makes it possible to detect hidden defective sites in the subgrade without disrupting its strength characteristics. A technique has been proposed to improve the carrying capacity of the failed subgrade of a railroad track using the combined arrangement of drainage pipes in the vertical and horizontal directions in the railroad embankment. The special feature of this technique is the possibility to drain water at the different levels of surface water, which provides for an increase in the carrying capacity of the failed subgrade. The strained-deformed state of the subgrade reinforced with tubular drainage has been investigated. The result has proven the effectiveness of the use of tubular drainages to improve the carrying capacity of the railroad track overmoistened subgrade exposed to constant and temporary loads. This study findings have established that the deformity of the subgrade increases when using tubular drainage, though this occurs only in the initial period of its arrangement, in further operation, when it removes water from the subgrade body, the carrying capacity of the subgrade, on the contrary, will improve due to the enhanced physical and mechanical properties of soils
Highlights
The main task in maintaining the subgrade is to ensure the serviceable condition of all its elements, prevent malfunctions, timely eliminate them, as well as eliminate the causes of malfunctions
The depth of arranging drainage pipes depends on the level of the water-saturated layers of subgrade, which are found from the results of georadar research
Our study shows that the amount of the concentration of the deformation distribution zone in the subgrade depends on the estimation scheme of arranging the drainage pipes
Summary
The main task in maintaining the subgrade is to ensure the serviceable condition of all its elements, prevent malfunctions, timely eliminate them, as well as eliminate the causes of malfunctions. Subgrade is the base of transportation lines, which perceives constant and temporary loads from vehicles In addition to these loads, the subgrade is exposed to natural and climatic influences (floods, precipitation), which cause a decrease or loss of its carrying capacity. One of the most common defects that lead to the emergence of deformations of the subgrade are defects of the Applied mechanics main site, manifested in the form of ballast recesses and ingestions These defects are dangerous because they indicate that the subgrade is undergoing soil overmoistening. The overmoistening of subgrade causes accelerated deterioration of the technical condition of the railroad track, loss of carrying capacity of the subgrade, which leads to an increase in the cost of maintenance of the track, including cleaning and ballast forking. We have considered, as one of the options, the possibility of using tubular drains and estimated the carrying capacity of the subgrade when they are used in different combinations of arrangement in the body of the railroad embankment
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