THE SUBGRADE HETEROGENEITY CONSIDERATION OF A RAILWAY TRACK WHEN DETERMINING ITS STRESS-STRAIN STATE
DOI:
https://doi.org/10.15802/stp2018/152920Keywords:
stress-strain state, subgrade, railway track, stress, displacement, settlingAbstract
Purpose. Increase of the speed and train carrying capacity causes the increase in the load on the railway track and, in turn, loads on the subgrade. This makes it necessary to clarify the calculation methods, both the upper structure and the subgrade of the railway track. The purpose of the paper is the development of a method for determining the stress-strain state of railway subgrade on the basis of taking into account the limited distribution capacity, the extremity of the deformation area along the subgrade depth and its heterogeneity. Methodology. Based on the mixed method of B. N. Zhemochkin, according to which the actual curvilinear resistance diagram on the lower flat of the sleepers is replaced by a stepwise one, the joint operation of the rail-sleeper grate and the subgrade of the railway track is considered. Findings. The development of an axisymmetric columnar model of the subgrade is considered, which takes into account such important properties of the subgrade as the limited distribution capacity and the extremity of the deformation area on heterogeneous (layered) base. Based on the discrete method of
L. P. Vinokurov and the subgrade axisymmetric columnar model, the equations for displacements and stresses for i-th foundation layer have been obtained. As a result of differential equation system solution of the discrete method by a numerical method in which the functions of the matrices are represented by series, the vertical and radial displacements of the layered base are determined, after which the normal and shearing stresses at the base are determined. The implementation of B. N. Zhemochkin mixed method allows to determine the resistance from the bottom of sleepers and the deflections of the central sections of the sleepers-beams. Originality. Method for calculating the stress-strain state of railway subgrade during their joint operation on the basis of an axisymmetric columnar model has been developed. At this the limited distribution capacity, the extremity of the deformation area and the heterogeneity according to the depth of the base have been taken into account. Practical value. The results obtained make it possible to increase the accuracy of design solutions in the design of the railway subgrade, which in turn, resulting in increased reliability and service life of the railway track.
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