Ballastless track freezing and damage behavior calculation method

A ballastless track, calculation method technology, applied in calculation, computer-aided design, design optimization/simulation, etc.

Active Publication Date: 2019-10-29
SOUTHWEST JIAOTONG UNIV
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  • Description
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  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to address the above-mentioned deficiencies in the prior art and provide a ballastless track freezing and damage behavior calculation method to solve or improve the above-mentioned problems

Method used

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  • Ballastless track freezing and damage behavior calculation method
  • Ballastless track freezing and damage behavior calculation method
  • Ballastless track freezing and damage behavior calculation method

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Embodiment Construction

[0082] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0083] According to an embodiment of the present application, refer to figure 1 , the ballastless track freezing and damage behavior calculation method of this scheme, including:

[0084] S1. Obtain the bulk compression modulus of the porous skeleton of the poured concrete specimen according to the dynamic elastic wave test, and calculate the Biot coefficient;

[0085] S2. According to CT scanning and image recognition tec...

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Abstract

The invention discloses a ballastless track freezing and damage behavior calculation method which comprises the following steps: S1, acquiring a porous framework volume compression modulus of a pouredconcrete test piece according to a dynamic elastic wave test, and calculating to obtain a Biot coefficient; S2, acquiring pore structure distribution parameters and overall porosity of concrete testpieces according to CT scanning and image recognition technologies; S3, according to pore structure distribution parameters, acquiring temperature-freezing rate relation curve in freezing process of concrete test pieces through calculation; S4, according to a Young-Laplace equation ice-unfrozen water balance and ice-adsorbed water film balance relationship, constructing a function relationship among the average pore pressure, the temperature and the pore structure; and S5, Based on porous medium mechanics, Darcy's law of water migration in a porous medium and Friour's law of heat conduction ofa porous system, constructing a coupling control equation of a porous medium stress field, a temperature field and a seepage field to obtain an interaction relationship among structural stress, heattransfer and water migration in the ballastless track in the freeze-thaw process.

Description

technical field [0001] The invention belongs to the technical field of track freezing and damage behavior, and in particular relates to a calculation method for ballastless track freezing and damage behavior. Background technique [0002] my country has a vast territory, and quite a large part of the area is in the severe cold zone, and the concrete structure in this area is faced with a strong freeze-thaw cycle. Meteorological statistics show that the annual average number of freeze-thaw cycles in Lanzhou is 83.6 times, and that in Harbin, Heilongjiang is about 45 times. It is one of the main causes of damage and failure of concrete structures in the cold regions of northern my country. [0003] When designing the ballastless track structure, although the drainage and frost resistance of the track structure are considered, and corresponding drainage and frost resistance designs are made. However, due to improper construction and maintenance, a large amount of water will in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 任娟娟李潇刘学毅王吉邓世杰杜威李浩蓝李家乐曾学勤韦臻
Owner SOUTHWEST JIAOTONG UNIV
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