1.4 STRENGTHENING THE SLOPES OF THE ROADBED DURING PATH FLUCTUATIONS IN THE RAILWAY TRACK IN UZBEKISTAN

Аннотация

Abstract:

The article deals with the scientific direction related to determining the actual state of the roadbed. Also with periodic reinforcement of the roadbed. To strengthen the slopes of embankments and recesses, various types of geosynthetics are used-geotextiles, geogrids, drainage trays made of composite materials.

Key words:

Railway track, roadbed, geotextile, geogrid, drainage trays, train traffic.

The railway roadbed, unlike the upper structure of the track, is a long-term structure that can not be replaced and is operated during the entire life of the railway. Under the influence of external factors, defects and deformations occur in the roadbed, which affect the condition of the track and the safety of train traffic[1.2.3.4.5]

In General, the roadbed over a large area of the railway network of our country, despite its long service life, increased loads from rolling stock, and increased weight of the upper structure of the track, works satisfactorily. However, defects and deformations of the roadbed account for more than 6% of the operational length of the network's roads.

The defect of the roadbed is characterized by a violation of its transverse outlines of more than 31 %, ballast troughs of 2.6 %, deformations of the body of the embankment (sediments, alloys) of more than 30 %, and depths of more than 12 %. The rest are water washes, landslides, landslides, mudslides, karst, ice [6].

Laying the geogrid on the main site of the roadbed is performed during the repair of the path (modernization, reconstruction, major repairs) in two ways.

Fig.1. Protection of roadbed slopes

The mechanized complex should significantly speed up and reduce the cost of repairing the track using a volumetric geogrid, since there will be no need to remove the rail grid, the planned laying capacity should be approximately 100-150 m / h, the costs associated with closing the stretch will be reduced more than twice, the time of preparatory earthworks for laying geomaterials, their installation, filling and compaction will be reduced, the number of track workers will be reduced significantly, manual labor will be significantly reduced [7.8].

The original technological solution that made it possible to significantly simplify the mechanized technology of laying was the filling of crushed stone-gravel-sand mixture using the applied technology before the complex reaches the repaired site.

Fig.2. Strengthening of slopes of embankments with the use of joycec.

Stacked between the gravel prism and the upper platform of the subgrade intermediate protective layer performs several important functions: it works as a filter, preventing the penetration of pollutants on the upper area of the subgrade; receiving very little rainfall; increases frost heaving of the ground on the way; with sufficient thickness and proper sealing has a high load-bearing capacity, the load evenly; acts as a shock absorber, absorbing the vibrations during the passage of rolling stock.

To strengthen the main site of the roadbed, a number of methods are used: injection of cement mortar, mixing of soils, modification of the properties of clay by liming, and reinforcement.

To ensure the safety, reliability and profitability of Railways, optimal technologies should be applied, especially in conditions of increasing traffic volumes, increasing axial loads and train speeds.

References

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8. Abdualiyev, E.B. (2019) "Research of surface condition of the rails rollingon sections of high-speed and high-speed train traffic," Journal of Tashkent Institute of Railway Engineers: Vol.15:Iss.3,Article4. Available at: https://uzjournals.edu.uz/tashiit/vol15/iss3/4