Ballastless track freezing and damage behavior calculation method

A ballastless track, calculation method technology, applied in calculation, computer-aided design, design optimization/simulation, etc.
CN110390176AActive Publication Date: 2019-10-29SOUTHWEST JIAOTONG UNIV
7 Cites 7 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SOUTHWEST JIAOTONG UNIV
Publication Date
2019-10-29

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

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.
Need to check novelty before this filing date? Find Prior Art

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More