An evaluation method for the impact of ballastless track typical damage on the operation safety of a high-speed train

Abstract

The invention discloses an evaluation method for the impact of ballastless track typical damage on the operation safety of a high-speed train. The method is based on the dynamic model of a ballastlesstrack structure, and is characterized in that, based on the theory of space vibration analysis of a train-track system, track dynamics and random analysis of train derailment energy, through mechanics reasonable simplification, all kinds of typical damage of ballastless tracks are simulated to establishes the dynamic model of ballastless track structure in damaged state, and the vibration response ofdifferent damage types or different degree of the same damage on the track system is analyzed and calculated. Based on the dynamic calculation results and the damage classification criteria, the influence of different degrees of damage on the ride comfort and safety of ballastless track is determined. On the basis of reducing labor intensity, the invention can quickly determine the influence of various damage of ballastless track on the operation of high-speed train, thereby providing a basis for timely adopting corresponding maintenance measures and further providing a guarantee for the safe operation of the high-speed train.

Description

technical field [0001] The invention relates to the technical field of railway engineering maintenance, in particular to a method for evaluating the influence of ballastless track damage on the safety performance of train operation. Background technique [0002] The ballastless track structure of high-speed railway has the characteristics of good ride comfort and less maintenance, and has been widely used in our country. However, its track structure has been exposed to a complex atmospheric environment for a long time, and is affected by various factors such as train loads and environmental conditions, and various damages and diseases will inevitably occur. There is an urgent need for a method for evaluating the impact of typical damage on ballastless track on the safety of high-speed railway operation, to determine which damaged parts will only affect the overall aesthetics of the track structure, which influencing factors will directly cause irreversible damage to the conc...

AI Technical Summary

Problems solved by technology

However, its track structure has been exposed to a complex atmospheric environment for a long time, and is affected by various factors such as train loads and environmental conditions, which will inevitably produce various damages and diseases

There is an urgent need for a method for evaluating the impact of typical damage on ballastless track on the safety of high-speed railway operation, to determine which damaged parts will only affect the overall aesthetics of the track structure, which influencing factors will directly cause irreversible damage to the concrete, and which damaged parts will only affect the overall aesthetics of the track structure. The damage will directly affect the ride comfort, and in severe cases, the driving safety, so that corresponding maintenance measures can be taken according to the type of damage.

[0003]Through the on-the-spot investigation of the service conditions of ballastless tracks of high-speed railways in my country, many structural damages, deteriorations and even diseases were found, such as track slab and ballast slab cracks, mortar Layer separation joints, base and supporting layer cracks, turnout and ballastless ballast bed expansion joints in the interval are too large at low temperature, and turnout and interval ballastless ballast bed expansion joints are squeezed to death in high temperature periods, resulting in cracks and broken pieces of track plates at both ends , these damages will directly affect the overall aesthetics and durability of the track structure, reducing the service life of the ballastless track structure operation

The slab ballastless track structure and the double-block ballastless track structure are the main forms of the ballastless track structure. Once the track structure loses stability, such as the fastener clips breaking and loosening, the interlayer gap between the ballastless track structure and the space under the slab Damage to the ballastless track structure, such as ballast-less track structure, track bed arch, subgrade settlement, etc., will lead to a local mutation of the track structure rigidity, cause track dynamic irregularity and deterioration, reduce the bearing capacity of the track structure, and is not conducive to the safe and stable operation of high-speed trains

[0004] Various types of damage to the existing high-speed railways in operation have a significant impact on the force of the ballastless track structure. At present, there is still a lack of systematic and comprehensive damage status It is difficult to establish a reasonable hierarchical maintenance standard for ballastless track structure damage due to an effective assessment method for the impact of ballastless track structure

In addition, some minor track structure damage may not have a great impact on the safety and comfort of driving, but when the damage develops to a certain stage, it will directly affect the comfort and safety of driving

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