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A detection method for interlayer damage of ballastless track structure

A ballastless track, interlayer damage technology, applied in the direction of measuring devices, material inspection products, instruments, etc., can solve the problems of unsuitable ballastless track damage detection, electromagnetic waves are easily affected by steel bars, etc., and achieve intuitive detection results. Clear, accurate positioning, easy to test the effect of operation

Inactive Publication Date: 2016-08-17
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

In terms of non-destructive testing, bottom-penetrating radar is mostly used for damage detection of highways, but it is not suitable for damage detection of ballastless tracks because electromagnetic waves are easily affected by steel bars.

Method used

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  • A detection method for interlayer damage of ballastless track structure
  • A detection method for interlayer damage of ballastless track structure
  • A detection method for interlayer damage of ballastless track structure

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Embodiment Construction

[0022] The theory that realizes the object of the present invention adopts is:

[0023] (1) Vibration theory of track plate

[0024] Since the thickness of the track plate is much smaller than its length and width, the track plate can be regarded as an elastic thin plate in the vertical direction. According to the elastic thin plate theory, the vertical undamped free vibration equation of the track plate can be written as:

[0025] ∂ 4 w 1 ( x , y , t ) ∂ x 4 + 2 ∂ 4 w 1 ( x...

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Abstract

The invention discloses a non-destructive detection method for damage between layers of ballastless track, which adopts the Gaussian curvature index of track slab to identify single and multiple voids and gaps between layers of ballastless track, and is characterized in that it includes the following Steps: Under the given boundary conditions, the displacement modal value of the track plate in any order mode is obtained through modal analysis; the Gaussian curvature of the track plate is further solved by using the displacement mode to reflect the lateral and longitudinal curvature modes of the track plate , to determine the presence of damage. The invention uses the modal analysis theory to identify the presence of damage and the location of the damage through the first three Gaussian curvature indexes of the track plate, especially the first-order Gaussian curvature index is the most obvious. The method of the invention is a nondestructive detection method, the test operation is simple and convenient, and is not affected by the steel bars in the track slab, the detection result is intuitive and clear, not only can identify the existence of damage, but also can accurately locate the position of the damage.

Description

Technical field: [0001] The invention belongs to the technical field of railway tracks, in particular to the field of damage detection of ballastless tracks of high-speed railways. Background technique: [0002] The unit slab, longitudinally connected slab, and double-block ballastless track structures are currently the main ballastless track structure types on high-speed railways in my country, and the operating mileage has reached tens of thousands of kilometers. Ballastless track has high stability and durability, and rarely requires maintenance after construction. However, ballastless track is the basis of driving and has been exposed to complex atmospheric environments. The ballastless track mainly made of reinforced concrete has been subjected to continuous tests of water, temperature and train loads, accompanied by construction quality, technical defects, etc. Various problems and various diseases are unavoidable, especially for the track structure with CA mortar lay...

Claims

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Application Information

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IPC IPC(8): G01N33/00G01N33/38
Inventor 王平陈嵘肖杰灵韦凯赵才友胡志鹏徐井芒
Owner SOUTHWEST JIAOTONG UNIV
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