A Method for Determining the Structure Thickness of Ballasted Track High-Speed ​​Railway Subgrade

Abstract

The invention relates to a method for determining the thickness of a high speed railway bedding structure of a ballast track. The method mainly comprises the steps of determining the wheel loading force of the adjacent sleeper and the average pressure of the left side of the bottom of a sleeper 3 based on the normal distribution curve; considering the vertical diffusion of the wheel loading force of one sleeper side (left side) right below a wheel, the stress of a position right below the center of the sleeper bottom (left side), diffused obliquely by the wheel loading force of the other sleep side (right side), and the stress of a position right below the center of the sleeper bottom (left side), diffused obliquely by the wheel loading force of the bottoms of the left side and the right side of the adjacent sleeper, so as to obtain the relation of the total load stress of the vehicle in a depth position right below the wheel at left side and the depth and further obtain the thickness of the bedding structure. The method has simplicity in calculation and accurate result, thus further ensuring the service life of the railway and the safety operation of a train, and also reducing the railway repairing and maintaining costs and preventing waste.

Description

technical field [0001] The invention relates to the technical field of railway engineering, in particular to a method for determining the thickness of a ballast track high-speed railway bed structure. Background technique [0002] The load on the railway subgrade refers to the stress acting on the subgrade surface, including the static load of the weight of the track structure on the subgrade surface and the dynamic load transmitted to the subgrade surface through the wheels and tracks during the operation of the train. It is an important factor in determining the subgrade structure. in accordance with. In high-speed railways, as the train speed increases, the amplitude of continuous dynamic load on the subgrade will increase significantly, and the load characteristics of the subgrade will also change significantly, resulting in an increase in subgrade deformation. The post-construction settlement requirements of high-speed railways are more stringent, so higher requirement...

AI Technical Summary

Problems solved by technology

However, there are many deficiencies in the traditional method: 1. When the stress spreads, it only considers the stress transfer of the sleeper bearing the wheel load directly under the wheel, and does not consider the oblique diffusion of adjacent sleepers bearing the wheel load to the position directly below the wheel. 2. When calculating the average pressure of the bottom of the sleeper, the load mode of the full section of the bottom of the sleeper is considered, and the stress on the bottom of the sleeper is concentrated on the left and right wheel rails of the vehicle. In the lower part, the middle area of ​​the bottom of the sleeper is almost unaffected.

3. Due to the fact that the size of the diffusion angle and the diffusion mode of the stress diffusion need to be determined by human experience, the stress is transferred to the subgrade surface, the difference in the load distribution form of the subgrade surface, and the unreasonable load distribution form of the subgrade surface will cause a large impact on the calculation results. impact, the calculation accuracy cannot be guaranteed

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