CN106126790B - Appraisal procedure based on concrete elastic-plastic model track interlayer off-seam maintenance timing - Google Patents
Appraisal procedure based on concrete elastic-plastic model track interlayer off-seam maintenance timing Download PDFInfo
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- CN106126790B CN106126790B CN201610438578.4A CN201610438578A CN106126790B CN 106126790 B CN106126790 B CN 106126790B CN 201610438578 A CN201610438578 A CN 201610438578A CN 106126790 B CN106126790 B CN 106126790B
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Abstract
The present invention discloses a kind of track interlayer off-seam maintenance opportunity appraisal procedure based on concrete elastic-plastic model, comprising the following steps: establishes non-fragment orbit finite element model according to the track structure geometric dimension and physical attribute of field measurement；Apply the temperature load of different operating conditions to model, calculates analysis non-fragment orbit stress deformation situation；According to calculated non-fragment orbit stress and Aberration nephogram, the initiation region that off-seam occurs is determined；Calculate analysis off-seam region off-seam width, the occurrence and development situation that depth varies with temperature, existing specification " ballastless track of high-speed railway maintenance management method " compares with China, judges hurt grade；Based on above-mentioned evaluation grade, temperature amplitude of variation limit value and its corresponding timing node determine reasonable maintenance opportunity.The present invention is based on live track and environmental conditions, not only can determine off-seam appearance position, but also can analyze and predict the evolution of off-seam, propose the maintenance opportunity of reasonable track interlayer off-seam.
Description
Technical field
The present invention relates to non-fragment orbit gapless track fields.More particularly, to a kind of II plate-type non-fragment orbit of CRTS
The appraisal procedure of track plates off-seam maintenance.
Background technique
Non-fragment orbit material composition is many and diverse, more by concrete, mortar, emulsified asphalt, geotextiles and elastic buffer bed course etc.
Kind material composition；Meanwhile structural shape is extremely complex, fragment-free track slab, position limiting structure, interconnecting piece provided with different types
Part, pedestal, sliding layer and adhesive layer etc.；Its stress receives the system on top gapless track, lower part roadbed, bridge tunnel basis etc. again
About, each inter-laminar stress transitive relation is complicated.The numerous and jumbled ballastless track structure system of this material, structural shape, in Complex Temperature
Under effect, mechanical characteristic is increasingly complex.Field research shows that non-fragment orbit such as II plate-type non-fragment orbit of CRTS in part is taking
Early stage labour phase, largely there is the off-seam disease problem between screed and base plate, track plates.
Off-seam problem cracks different from general concrete structure, and non-fragment orbit interlayer off-seam is mostly that adhesive layer is detached from institute
It causes, is weak discontinuous and strong discontinuity problem mixing, in contact surface region, due to being contacted after the discontinuous and work of material
It is bad, off-seam phenomenon can be generated in different geometry interface, that is, interlayers.And crackle caused by concrete cracking, have it is stronger can not
Predictability, crack are generally only sprouted in a kind of material, are developed, and the variation of the material mechanical performance is ultimately caused.And interlayer
The structure of off-seam, usually two kinds and the above different materials or same material difference sequence of construction be formed by faying face occur it is de-
It is viscous.It can be seen that off-seam and crack are two entirely different concepts, occurrence and development mechanism is also completely different.
Interlayer off-seam problem can cause track plates to come to nothing on a large scale, this to come to nothing on the one hand under hot-short excitation,
High-frequency percussion repeatedly each other, structure interlayer hurt accelerate.High frequency hydraulic pressure pair when aqueous in off-seam region, under high frequency load
Non-fragment orbit erosion effect aggravation, easily causes screed to isolate grout problem, expands range of coming to nothing.On the other hand, track plates
Significant impact can be brought to the travel safety of bullet train by coming to nothing on a large scale.
As described above, II plate-type non-fragment orbit interlayer off-seam problem of CRTS track run during than more prominent,
Producing cause more be considered as the buckling deformation due to caused by temperature gradient, shearing effect, track plates caused by gradient of temperature with
The deterioration of screed material adhesive property and the poor equal factors of screed construction quality between base plate.Wherein, draw at present
The more generally acknowledged reason of off-seam is track structure layer temperature load effect between starting board, and cause interlayer off-seam develop the main reason for
Then it is summed up as the buckling deformation of the track plates as caused by temperature gradient.
Currently, due to the theoretical direction for being short of maintenance in addition and lacking science of operation experience, maintenance department pair
The processing of the diseases problem such as off-seam, arch for occurring due to temperature deformation is lacked of proper care of above-mentioned non-fragment orbit be mostly use " treat the head when the head aches,
The mode of foot pain doctor foot ", it is unknown to Complicated Loads combined situation lower railway force-mechanism and failure mechanism understanding, lead to maintenance side
Formula, maintenance opportunity etc. have certain shortcoming so that will appear summer regulation route will appear in winter it is even more serious
There is adjacent area in disease, the route locally renovated or the disease second year of larger range of disease, the previous year regulation still goes out
Now even aggravation etc..So it is necessary to study off-seam development mechanisms for pole, off-seam development indicators are determined, propose a kind of non-fragment orbit rail
The appraisal procedure on guidance tape off-seam maintenance opportunity, to improve maintenance correlation theory, for ballastless track boards in the future from
The engineering practices such as seam regulation provide scientific guidance and theory support.
Summary of the invention
The technical problem to be solved in the present invention is to provide it is a kind of based on the slab track interlayer of concrete elastic-plastic model from
The appraisal procedure on maintenance opportunity is stitched, which can be to engineering practices offer sections such as ballastless track boards off-seam regulations
Learn guidance and theory support.
In order to solve the above technical problems, the present invention adopts the following technical solutions:
A kind of appraisal procedure on the slab track interlayer off-seam maintenance opportunity based on concrete elastic-plastic model, including
Following steps:
According to the track structure geometric dimension and physical attribute of field measurement, the finite element model of non-fragment orbit is established；
Condition and measured data temperature load amplitude and temperature gradient distribution depending on the site environment, to the no tiny fragments of stone, coal, etc. rail
The track plates of the finite element model in road apply the temperature load of different operating conditions, extract and answer in the finite element model of the non-fragment orbit
The maximum value of the equivalent plastic deformation in power concentrated area, and according to the size of institute's division unit, plastic deformation is acquired, is analyzed without tiny fragments of stone, coal, etc. rail
The stress deformation rule of the finite element model in road；
According to the stress and deformation result of the finite element model of calculated non-fragment orbit, become in conjunction with plasticity is added up in cloud atlas
The position in the maximum region of shape determines the position that off-seam occurs；
The occurrence and development situation that analysis off-seam region off-seam width, depth vary with temperature is calculated, and specified in specification
Off-seam width, off-seam depth management standard compare, and obtain hurt grade；
Based on above-mentioned hurt grade, temperature changes amplitude and its corresponding timing node.
Preferably, the track structure geometric dimension includes rail size, track board size, width joint size, cement
Emulsified asphalt slurry layer size and supporting course size.
Preferably, the physical attribute includes density, elasticity modulus, the Poisson's ratio, thermal expansion coefficient, surrender of track structure
Intensity and yield strain.
Preferably, the temperature load includes extreme temperature and temperature gradient.
Preferably, the off-seam width is track plates lower surface hanging down to cement emulsified asphalt mortar layer upper surface after deformation
Straight distance.
Preferably, the off-seam depth is track plates side and cement emulsified asphalt mortar leafing seam delaminated area after deformation
Lateral distance.
Preferably, the temperature change amplitude is under least favorable temperature load operating condition, and off-seam develops to must on-call maintenance
When permitted range of temperature maximum value.
Beneficial effects of the present invention are as follows:
The present invention provides the track interlayer off-seams based on concrete elastic-plastic model to safeguard opportunity appraisal procedure, this method
It can be applied not only in ballastless track boards off-seam hurt, also extend to the non-fragment orbit hurt regulation of other forms
On, such as width joint failure；Method provided by the invention can determine that initiation region occurs for off-seam, judge off-seam development evolvement
The case where, by control range of temperature limit value and timing node, propose reasonable maintenance opportunity.It is different from previous
Force analysis is carried out to the linear elasticity stage of track structure, breaches previous finite element method using ELASTIC PLASTIC HARDENING MODEL
In cannot consider the limitation of accumulating plastic deformation and material damage.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing.
Fig. 1 shows flow diagram of the present invention.
Fig. 2 shows the non-fragment orbit finite element model figures of one embodiment of the invention.
Fig. 3 shows the curve graph of the material constitutive relation of one embodiment of the invention.
Fig. 4 shows the schematic diagram that is further applied load of one embodiment of the invention.
Fig. 5 shows equivalent stress cloud atlas under the bulk temperature load of one embodiment of the invention.
Fig. 6 shows equivalent plastic strain cloud atlas under the bulk temperature load of one embodiment of the invention.
Fig. 7 shows equivalent plastic strain cloud atlas under the thermal gradient of one embodiment of the invention.
The off-seam that Fig. 8 shows one embodiment of the invention develops thin portion schematic diagram.
The off-seam depth and width that Fig. 9 shows one embodiment of the invention vary with temperature curve graph.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, the track interlayer off-seam based on concrete elastic-plastic model safeguards opportunity appraisal procedure, including as follows
Step:
1. determining off-seam initiation region
1.1 establish non-fragment orbit ELASTIC PLASTIC HARDENING MODEL using ABAQUS finite element software, simulate temperature under different operating conditions
The effect of load, analyze each position of non-fragment orbit stress deformation situation, thus according to equivalent stress cloud atlas, Aberration nephogram, etc.
Plastic strain cloud atlas and surrender cloud atlas are imitated, determines the initiation region that off-seam occurs.
Different, the of the invention non-fragment orbit hardening Plastic with the crack of extension finite element analysis prediction concrete structure
Model, without adding preset condition, the initiation region of the generation of off-seam is totally unknown, only by model after application temperature load
Actual loading deformation state and plasticity hurt region, so that it is determined that out off-seam occur initiation region.Since distress in concrete is sent out
Open up sufficiently complex, regular difficulty is sought, and therefore, currently based on the crack prediction method of extension finite element, is generally required specifically
Know that crack is preset in position, and give the path of prefabricated crack progressing, to study the spread scenarios in crack.
1.2 as shown in Fig. 2, acquisition non-fragment orbit geometric dimension, establishes non-fragment orbit finite element fraction using ABAQUS software
Analyse model；The geometric dimension of ballastless track boards is long 6450mm, wide 2550mm, thick 200mm, and the wide wide 210mm of seam is deep
100mm, the narrow wide 50mm of seam, deep 100mm, cement emulsified asphalt mortar layer long 6450mm, wide 2550mm, thick 30mm, supporting layer
Long 6450mm, wide 2950mm, thick 300mm.
1.3 as shown in figure 3, choose non-fragment orbit physical attribute, density, elasticity modulus, Poisson's ratio including rail material,
Thermal expansion coefficient, yield strength, yield strain, track plates use C55 concrete, density 2500kg/m3, elasticity modulus is
3.55×1010Pa, Poisson's ratio take 0.167, and thermal expansion coefficient takes 1.18 × 10-5M/ DEG C, yield stress initial value takes 17MPa,
Yield strain initial value is taken as 0.Its density of cement emulsified asphalt mortar layer is 1800kg/m3, elasticity modulus is 7 × 109Pa, pool
Loose ratio takes 0.167, and thermal expansion coefficient takes 1.18 × 10-5M/ DEG C, yield stress initial value takes 9MPa, and yield strain initial value is taken as
0.Supporting layer uses C40 concrete, density 2400kg/m3, elasticity modulus is 3.25 × 1010Pa, Poisson's ratio take 0.167,
Thermal expansion coefficient takes 1.18 × 10-5M/ DEG C, yield stress initial value takes 15MPa, and yield strain initial value is taken as 0.
This model method, the hardening effect based on material, using elastic-plastic analysis theory, to the occurrence and development mechanism of off-seam
It is studied, therefore material properties define the true stress that need to input scatterplot form and plastic strain, extend finite element with ABAQUS
Module, no matter model principle or model post-processing characteristic manner, be all different.
1.4 as shown in figure 4, define initial temperature and temperature transfer mode by applying predefined temperature field to track plates,
With analog orbit plate under whole temperature rise, whole temperature drop temperature drop and temperature gradient effect, the stress deformation situation of non-fragment orbit.
Specific point of three kinds of operating conditions apply temperature load, as shown in table 1 below.
1 non-fragment orbit model of table is further applied load operating condition table
1.5 as shown in figure 5, obtain ballastless track structure stress deformation equivalent stress cloud by applying bulk temperature load
Figure, in conjunction with equivalent stress numerical value calculated and track structure equivalent plastic strain cloud atlas (shown in Fig. 6), it may be determined that laitance
Change tar sand pulp layer adjacent edges are the biggish position of stress deformation, thus development should takes place in off-seam.
The development evolvement situation that two, off-seam indexs vary with temperature
2.1, based on the case where length of off-seam, width change therewith under different temperatures effect, as shown in table 2 below, determine temperature
Spend amplitude of variation limit value and timing node.Fig. 7 is equivalent plastic strain cloud atlas under thermal gradient.Fig. 8 is that off-seam thin portion is shown
It is intended to.Deformation displacement cloud atlas, off-seam thin portion schematic diagram and cement emulsified asphalt mortar layer are displaced under combination temperature gradient load
Numerical value, it may be determined that the specific value of the length and width of off-seam.
Unlike extension finite element crack spread scenarios, each index of the off-seam of this method is quantization, Er Feiding
Property analysis or apparent prediction by extracting the index value of each step off-seam development evolvement curve is depicted as, by data
Quantitative analysis obtains off-seam rule of development, and proposes maintenance opportunity based on this.
2 off-seam depth and width of table vary with temperature statistical form
2.2 as shown in figure 9, can draw out off-seam width, the curve graph that off-seam depth varies with temperature based on 2.1 steps.
Based on the curve graph and current Chinese code of practice is combined, can propose assessment side for the maintenance opportunity of ballastless track boards off-seam
Method.As can be seen that off-seam width is when range of temperature is up to -45 DEG C (i.e. whole 45 DEG C of cooling) from table 2 and Fig. 9 curve
0.173mm is less than 1mm, and off-seam depth belongs to 20~50mm range in specification up to 30mm, so as to be used as one for -45 DEG C
Range of temperature limit value.When range of temperature reaches 50 DEG C (i.e. up to -45 DEG C of (i.e. whole 45 DEG C of cooling)+negative temperature gradients
Track plates upper surface is 10 DEG C lower than lower surface) when, off-seam width is 0.51mm, is less than 1mm, and off-seam depth belongs to up to 60mm
Specification hurt grade II, it is seen then that for the purposes of this example, in conjunction with hurt grade and there is the time corresponding to different temperatures, it can be true
Fixed this example range of temperature limit value is about -45 DEG C, and least favorable temperature composite condition is whole temperature drop 45 DEG C+negative temperature ladder
50 DEG C of degree, at the time of timing node is each temperature case of corresponding appearance, i.e., when environmental condition reaches the temperature change width of this example
Limit value or least favorable temperature composite condition are spent, just needs to carry out maintenance work.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention may be used also on the basis of the above description for those of ordinary skill in the art
To make other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to this hair
The obvious changes or variations that bright technical solution is extended out are still in the scope of protection of the present invention.
Claims (7)
1. a kind of appraisal procedure on the slab track interlayer off-seam maintenance opportunity based on concrete elastic-plastic model, feature
It is, comprising the following steps:
According to the track structure geometric dimension and physical attribute of field measurement, the finite element mould of non-fragment orbit elastic-plastic model is established
Type；
Condition and measured data temperature load amplitude and temperature gradient distribution depending on the site environment, to the non-fragment orbit
The track plates of finite element model apply the temperature load of different operating conditions, extract stress collection in the finite element model of the non-fragment orbit
The maximum value of middle region equivalent plastic deformation, and according to the size of institute's division unit, plastic deformation is acquired, non-fragment orbit is analyzed
The stress deformation rule of finite element model；
According to the stress and deformation result of the finite element model of calculated non-fragment orbit, add up plastic deformation most in conjunction in cloud atlas
The position in big region determines the position that off-seam occurs；
Analysis off-seam region off-seam width is calculated, the occurrence and development situation that depth varies with temperature, with off-seam specified in specification
Width, off-seam depth management standard compare, and obtain hurt grade；
Based on above-mentioned hurt grade, temperature changes amplitude and its corresponding timing node.
2. appraisal procedure according to claim 1, it is characterised in that: the track structure geometric dimension includes rail ruler
Very little, track board size, width joint size, cement emulsified asphalt mortar layer size and supporting course size.
3. appraisal procedure according to claim 1, it is characterised in that: the physical attribute include track structure density,
Elasticity modulus, Poisson's ratio, thermal expansion coefficient, yield strength and yield strain.
4. appraisal procedure according to claim 1, it is characterised in that: the temperature load includes extreme temperature and temperature ladder
Degree.
5. appraisal procedure according to claim 1, it is characterised in that: the off-seam width is track plates lower surface after deformation
To the vertical range of cement emulsified asphalt mortar layer upper surface.
6. appraisal procedure according to claim 1, it is characterised in that: the off-seam depth be deformation after track plates side with
The lateral distance of cement emulsified asphalt mortar leafing seam delaminated area.
7. appraisal procedure according to claim 1, it is characterised in that: the temperature change amplitude is least favorable temperature load
Under operating condition, off-seam develops to permitted range of temperature maximum value when necessary on-call maintenance.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106845014B (en) * | 2017-02-22 | 2020-04-28 | 中南大学 | Method for calculating temperature crack width of track slab |
| CN108563828B (en) * | 2018-03-12 | 2021-03-16 | 北京交通大学 | Switch point rail longitudinal crack propagation process analysis method and maintenance method |
| CN109614674B (en) * | 2018-11-28 | 2022-08-30 | 武汉大学 | Dynamic detection method for gap and void between layers of ballastless track of high-speed railway |
| CN110936978B (en) * | 2019-12-13 | 2021-02-02 | 中铁第四勘察设计院集团有限公司 | Ballastless track interlayer gap measuring method and device based on measuring trolley |
| CN115964920B (en) * | 2023-03-16 | 2023-05-16 | 武汉大学 | Finite element simulation-based ballastless track CA mortar layer void length estimation method |
| CN118248255B (en) * | 2024-02-27 | 2024-09-10 | 西南交通大学 | Inter-plate joint elastic modulus equivalent calculation method for temperature stress release of longitudinally connected plate type ballastless track |
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