Methodology for assessing the dynamic impact of rolling stock on the subgrade and justification for its reinforcement in the area of rail joints
DOI:
https://doi.org/10.56143/rr9myx06Keywords:
Dynamic impact, rail joints, subgrade, dynamic addition coefficient, dynamic coefficient, vertical stresses, geosynthetic materials, geotextiles, geogrids, track bed reinforcement, high-speed traffic, axial load, standard stressesAbstract
The article proposes a method for assessing the dynamic impact of rolling stock on the subgrade in the rail joint area, taking into account speed regimes and axial loads, based on the calculated relationship Kпг→Y→σ(z) and a normative check using the criterion σ(z)≤0.5 MPa. An assessment of the conditions for exceeding the standard stresses during high-speed passenger and freight traffic has been carried out, and the introduction of the dynamic coefficient kdyn to account for shock-pulse effects has been justified. It has been shown that the use of a combined reinforcement system of ‘geotextile + flat geogrid’ reduces vertical stresses in the main subgrade area by 25–30% and forms a standard reserve of bearing capacity of the foundation. The results obtained can be used in the design and modernisation of railway lines with mixed and high-speed traffic in rail joint areas.
