CN106126790A - Track interlayer gap based on concrete elastic-plastic model safeguards appraisal procedure on opportunity - Google Patents
Track interlayer gap based on concrete elastic-plastic model safeguards appraisal procedure on opportunity Download PDFInfo
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Abstract
The present invention discloses a kind of track interlayer gap based on concrete elastic-plastic model and safeguards appraisal procedure on opportunity, comprises the following steps: track structure physical dimension and physical attribute according to field measurement set up non-fragment orbit FEM (finite element) model；Model is applied the temperature load of different operating mode, computational analysis non-fragment orbit stress deformation situation；According to the non-fragment orbit stress calculated and Aberration nephogram, determine the initiation region that gap occurs；The generation development that computational analysis gap region gap width, the degree of depth vary with temperature, the specification " ballastless track of high-speed railway maintenance management method " existing with China contrasts, it is judged that trauma grade；Based on above-mentioned evaluation grade, determine that range of temperature limit value and corresponding timing node thereof determine rational maintenance opportunity.The present invention, based on on-the-spot track and environmental condition, both can determine that position occurred in gap, can analyze and predict again the evolution of gap, proposed the maintenance opportunity of rational track interlayer gap.
Description
Technical field
The present invention relates to non-fragment orbit gapless track field.More particularly, to a kind of CRTS II plate-type non-fragment orbit
The appraisal procedure of track plates gap maintenance.
Background technology
Non-fragment orbit material constitutes numerous and diverse, many by concrete, mortar, emulsified asphalt, geotextiles and elastic buffer bed course etc.
Plant material composition；Meanwhile, its structural shape is extremely complex, is provided with the fragment-free track slab of different types, position limiting structure, connecting portion
Part, base, sliding layer and tack coat etc.；Its stress receives again the system on top gapless track, bottom roadbed, bridge tunnel basis etc.
About, each inter-laminar stress transitive relation is complicated.The ballastless track structure system that this material, structural shape are numerous and jumbled, at Complex Temperature
Under effect, its mechanical characteristic is increasingly complex.Field Research shows, part non-fragment orbit such as CRTS II plate-type non-fragment orbit is at clothes
The labour phase in early days, occurs in that the gap disease problem between screed and bedplate, track plates in a large number.
Gap problem is different from general xoncrete structure cracking, and non-fragment orbit interlayer gap mostly is tack coat and departs from institute
Cause, be weak discontinuous and the mixing of strong discontinuity problem, in contact surface region, owing to contacting after the discontinuous of material and work
Bad, gap phenomenon can be produced at different geometry interface i.e. interlayers.And crackle caused by concrete cracking, have higher can not
Predictability, its crack is normally only sprouted in a kind of material, is developed, ultimately causes the change of this material mechanical performance.And interlayer
Gap, the faying face that the structure of usually two kinds and above different materials or same material difference sequence of construction is formed occurs de-
Viscous.As can be seen here, gap and crack are diverse two concepts, and it occurs development mechanism to differ the most completely.
On the one hand interlayer gap problem can cause track plates to come to nothing on a large scale, this comes to nothing under hot-short encourages,
High-frequency percussion the most repeatedly, structure interlayer trauma is accelerated.In gap region aqueous time, the high frequency hydraulic pressure pair under high frequency load
Non-fragment orbit erosion effect aggravates, and easily causes screed to isolate grout problem, expands scope of coming to nothing.On the other hand, track plates
Come to nothing on a large scale and the travel safety of bullet train can be brought significant impact.
As it has been described above, CRTS II plate-type non-fragment orbit interlayer gap problem ratio during track is runed is more prominent, its
Producing cause is considered as the buckling deformation owing to thermograde causes more, gradient of temperature causes shearing effect, track plates with
The deterioration of screed material adhesive property and the factors such as screed construction quality is poor between bedplate.Wherein, draw at present
Playing the reason that gap is more generally acknowledged between plate is track structure layer temperature load effect, and causes the main cause that interlayer gap develops
Then it is summed up as by the buckling deformation of track plates caused by thermograde.
At present, owing to the shortcoming maintenance in addition of operation experience lacks the theoretical direction of science, maintenance department pair
Gap that above-mentioned non-fragment orbit occurs because temperature deformation imbalance, the process of the disease problem such as arch be mostly to use " treat the head when the head aches,
Foot pain doctor's foot " mode, Complicated Loads combined situation lower railway force-mechanism and failure mechanism are understood not clear, cause maintenance side
The aspects such as formula, maintenance opportunity have certain shortcoming, so that the circuit that there will be regulation in summer there will be even more serious in the winter time
Disease, the circuit of local regulation occur that the disease Second Year of adjacent area or larger range of disease, regulation the previous year still goes out
The most even aggravation etc..So pole is necessary to study gap development mechanism, determine gap development indicators, propose a kind of non-fragment orbit rail
The appraisal procedure on guidance tape gap 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 a kind of track interlayer gap based on concrete elastic-plastic model dimension
Protecting appraisal procedure on opportunity, this appraisal procedure can provide scientific guidance and reason to engineering practices such as ballastless track boards gap regulations
Opinion supports.
For solving above-mentioned technical problem, the present invention uses following technical proposals:
A kind of track interlayer gap based on concrete elastic-plastic model safeguards appraisal procedure on opportunity, comprises the following steps:
Track structure physical dimension according to field measurement and physical attribute, set up the FEM (finite element) model of non-fragment orbit；
Temperature load amplitude and temperature gradient distribution is determined, to described rail without the tiny fragments of stone, coal, etc. according to field environmental condition and measured data
The track plates of the FEM (finite element) model in road applies the temperature load of different operating mode, and extracting should in the FEM (finite element) model of described non-fragment orbit
The maximum of power concentrated area equivalence plastic deformation, and according to the size of institute's division unit, try to achieve plastic deformation, analyze without tiny fragments of stone, coal, etc. rail
The stress deformation rule of the FEM (finite element) model in road；
The stress of the FEM (finite element) model according to the non-fragment orbit calculated and deformation result, become in conjunction with plasticity accumulative in cloud atlas
The position in the region that shape is maximum, determines the position that gap occurs；
Regulation in the generation development that computational analysis gap region gap width, the degree of depth vary with temperature, with specification
Gap width, gap depth management standard contrast, and draw trauma grade；
Based on above-mentioned trauma grade, determine variations in temperature amplitude and corresponding timing node thereof.
Preferably, described track structure physical dimension includes rail size, track plates size, width joint size, cement
Emulsified asphalt slurry layer size and supporting course size.
Preferably, described physical attribute includes the density of track structure, elastic modelling quantity, Poisson's ratio, thermal coefficient of expansion, surrender
Intensity and yield strain.
Preferably, described temperature load includes extreme temperature and thermograde.
Preferably, track plates lower surface hanging down to cement emulsified asphalt mortar layer upper surface after described gap width is deformation
Straight distance.
Preferably, after the described gap degree of depth is degeneration, delaminated area is stitched with cement emulsified asphalt mortar leafing in track plates side
Lateral separation.
Preferably, described variations in temperature amplitude is under least favorable temperature load operating mode, and gap develops into must on-call maintenance
Time the range of temperature maximum that allowed.
Beneficial effects of the present invention is as follows:
The invention provides track interlayer gap based on concrete elastic-plastic model and safeguard appraisal procedure on opportunity, the method
Can be applied not only in ballastless track boards gap trauma, it is also possible to extend to the non-fragment orbit trauma regulation of other form
On, such as width joint failure；The method that the present invention provides, it may be determined that gap occurs initiation region, it is judged that gap development evolvement
Situation, by controlling range of temperature limit value and timing node, rational maintenance opportunity is proposed.The most only it is different from
The linear elasticity stage of track structure is carried out force analysis, utilizes ELASTIC PLASTIC HARDENING MODEL to breach conventional finite element method
In can not consider the limitation of accumulating plastic deformation and material damage.
Accompanying drawing explanation
Below in conjunction with the accompanying drawings the detailed description of the invention of the present invention is described in further detail.
Fig. 1 shows FB(flow block) of the present invention.
Fig. 2 shows the non-fragment orbit FEM (finite element) model figure of one embodiment of the invention.
Fig. 3 shows the curve chart 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.
Fig. 8 shows that the gap of one embodiment of the invention develops thin portion schematic diagram.
Fig. 9 shows that the gap degree of depth of one embodiment of the invention, width vary with temperature curve chart.
Detailed description of the invention
In order to be illustrated more clearly that the present invention, below in conjunction with preferred embodiments and drawings, the present invention is done further
Bright.Parts similar in accompanying drawing are indicated with identical reference.It will be appreciated by those skilled in the art that institute is concrete below
The content described is illustrative and be not restrictive, and should not limit the scope of the invention with this.
As it is shown in figure 1, track interlayer gap based on concrete elastic-plastic model safeguards appraisal procedure on opportunity, including as follows
Step:
1. determine gap initiation region
1.1 use ABAQUS finite element software to set up non-fragment orbit ELASTIC PLASTIC HARDENING MODEL, temperature under the different operating mode of simulation
The effect of load, analyze each position of non-fragment orbit stress deformation situation, thus according to equivalent stress cloud atlas, Aberration nephogram, etc.
Effect plastic strain cloud atlas and surrender cloud atlas, determine the initiation region that gap occurs.
Different with the crack being expanded with finite element analysis prediction xoncrete structure, the non-fragment orbit hardening Plastic of the present invention
Model, it is not necessary to add pre-conditioned, the initiation region of the generation of gap is totally unknown, only by model after applying temperature load
Actual loading deformation state and plasticity trauma region, so that it is determined that go out gap occur initiation region.Owing to distress in concrete is sent out
Opening up sufficiently complex, rule difficulty is sought, and therefore, is currently based on the crack prediction method of extension finite element, generally requires the most
Know that crack, and the path of given prefabricated crack progressing are preset in position, thus study the spread scenarios in crack.
1.2, as in figure 2 it is shown, gather non-fragment orbit physical dimension, utilize ABAQUS software to set up non-fragment orbit finite element fraction
Analysis model；The physical dimension of ballastless track boards is long 6450mm, wide 2550mm, thick 200mm, wide seam width 210mm, deeply
100mm, narrow seam width 50mm, deep 100mm, the long 6450mm of cement emulsified asphalt mortar layer, wide 2550mm, thick 30mm, supporting layer
Long 6450mm, wide 2950mm, thick 300mm.
1.3 as it is shown on figure 3, choose non-fragment orbit physical attribute, including the density of rail material, elastic modelling quantity, Poisson's ratio,
Thermal coefficient of expansion, yield strength, yield strain, track plates uses C55 concrete, and its density is 2500kg/m3, elastic modelling quantity is
3.55×1010Pa, Poisson's ratio takes 0.167, and thermal coefficient of expansion takes 1.18 × 10-5M/ DEG C, yield stress initial value takes 17MPa, bends
Clothes strain initial value is taken as 0.Its density of cement emulsified asphalt mortar layer is 1800kg/m3, elastic modelling quantity is 7 × 109Pa, Poisson
Ratio takes 0.167, and thermal coefficient of expansion 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, and its density is 2400kg/m3, elastic modelling quantity is 3.25 × 1010Pa, Poisson's ratio takes 0.167, heat
The coefficient of expansion 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, hardening effect based on material, use elastic-plastic analysis theoretical, the generation development mechanism to gap
Study, therefore material properties definition need to input true stress and the plastic strain of scatterplot form, extends finite element with ABAQUS
Module, the no matter principle of model, or the characteristic manner of model post processing, all differ.
1.4 as shown in Figure 4, by track plates being applied predefined temperature field, and definition initial temperature and temperature transfer mode,
With analog orbit plate under overall temperature rise, overall temperature drop temperature drop and thermograde effect, the stress deformation situation of non-fragment orbit.
Concrete point of three kinds of operating modes apply temperature load, as shown in table 1 below.
Table 1 non-fragment orbit model is further applied load operating mode table
1.5 as it is shown in figure 5, by applying bulk temperature load, draw ballastless track structure stress deformation equivalent stress cloud
Figure, in conjunction with the equivalent stress numerical value calculated and track structure equivalent plastic strain cloud atlas (shown in Fig. 6), it may be determined that cement-emulsified
Tar sand pulp layer adjacent edges is the position that stress deformation is bigger, and gap should thus start to develop.
Two. the development evolvement situation that gap index varies with temperature
2.1 situations about changing therewith based on the length of gap, width under different temperatures effect, as shown in table 2 below, determine temperature
Degree amplitude of variation limit value and timing node.Fig. 7 is equivalent plastic strain cloud atlas under thermal gradient.Fig. 8 is that the thin portion of gap shows
It is intended to.In conjunction with deformation displacement cloud atlas, gap thin portion schematic diagram and cement emulsified asphalt mortar layer displacement under thermal gradient
Numerical value, it may be determined that the concrete numerical value of the length and width of gap.
Unlike extension finite element fracture propagation situation, each index of gap of this method, is all to quantify, rather than fixed
Property analyze or apparent prediction, by extract each step gap index value, be depicted as development evolvement curve, by data
Quantitative analysis, draws gap rule of development, and proposes maintenance opportunity based on this.
The table 2 gap degree of depth, width vary with temperature statistical table
2.2 as it is shown in figure 9, based on 2.1 steps, can draw out gap width, the curve chart that the gap degree of depth varies with temperature.
Based on this curve chart and combine current Chinese code of practice, can be that the maintenance of ballastless track boards gap proposes assessment side opportunity
Method.It can be seen that work as range of temperature to reach-45 DEG C (i.e. overall coolings 45 DEG C) from table 2 and Fig. 9 curve, gap width is
0.173mm, less than 1mm, the gap degree of depth, up to 30mm, belongs to 20～50mm scope in specification, thus can be using-45 DEG C as one
Range of temperature limit value.50 DEG C are reached (i.e. when range of temperature reaches-45 DEG C of (i.e. overall cooling 45 DEG C)+negative temperature gradients
Track plates upper surface is lower 10 DEG C than lower surface) time, gap width is 0.51mm, and less than 1mm, the gap degree of depth, up to 60mm, belongs to
Specification trauma grade II, it is seen then that for the purposes of this example, in conjunction with trauma grade and the time corresponding to different temperatures occurs, can be true
Fixed this example range of temperature limit value is about-45 DEG C, and least favorable temperature composite condition is overall 45 DEG C+negative temperature gradient of temperature drop
50 DEG C, timing node is the corresponding moment each temperature case occur, i.e. reaches the range of temperature of this example when environmental condition
Limit value or least favorable temperature composite condition, just need to carry out maintenance work.
Obviously, the above embodiment of the present invention is only for clearly demonstrating example of the present invention, and is not right
The restriction of embodiments of the present invention, for those of ordinary skill in the field, the most also may be used
To make other changes in different forms, cannot all of embodiment be given exhaustive here, every belong to this
What bright technical scheme was extended out obviously changes or changes the row still in protection scope of the present invention.
Claims (7)
1. a track interlayer gap based on concrete elastic-plastic model safeguards appraisal procedure on opportunity, it is characterised in that include
Following steps:
Track structure physical dimension according to field measurement and physical attribute, set up the FEM (finite element) model of non-fragment orbit；
Temperature load amplitude and temperature gradient distribution is determined, to described non-fragment orbit according to field environmental condition and measured data
The track plates of FEM (finite element) model applies the temperature load of different operating mode, extracts stress collection in the FEM (finite element) model of described non-fragment orbit
The maximum of middle region equivalent plastic deformation, and according to the size of institute's division unit, try to achieve plastic deformation, analyze non-fragment orbit
The stress deformation rule of FEM (finite element) model；
The stress of the FEM (finite element) model according to the non-fragment orbit calculated and deformation result, in conjunction with plastic deformation accumulative in cloud atlas
The position in big region, determines the position that gap occurs；
The gap of regulation in the generation development that computational analysis gap region gap width, the degree of depth vary with temperature, with specification
Width, gap depth management standard contrast, and draw trauma grade；
Based on above-mentioned trauma grade, determine variations in temperature amplitude and corresponding timing node thereof.
Appraisal procedure the most according to claim 1, it is characterised in that: described track structure physical dimension includes rail chi
Very little, track plates size, width joint size, cement emulsified asphalt mortar layer size and supporting course size.
Appraisal procedure the most according to claim 1, it is characterised in that: described physical attribute include track structure density,
Elastic modelling quantity, Poisson's ratio, thermal coefficient of expansion, yield strength and yield strain.
Appraisal procedure the most according to claim 1, it is characterised in that: described temperature load includes extreme temperature and temperature ladder
Degree.
Appraisal procedure the most according to claim 1, it is characterised in that: described gap width is track plates lower surface after deformation
Vertical dimension to cement emulsified asphalt mortar layer upper surface.
Appraisal procedure the most according to claim 1, it is characterised in that: the described gap degree of depth be after degeneration track plates side with
The lateral separation of cement emulsified asphalt mortar leafing seam delaminated area.
Appraisal procedure the most according to claim 1, it is characterised in that: described variations in temperature amplitude is least favorable temperature load
Under operating mode, gap develop into must on-call maintenance time the range of temperature maximum that allowed.
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| CN201610438578.4A CN106126790B (en) | 2016-06-17 | 2016-06-17 | Appraisal procedure based on concrete elastic-plastic model track interlayer off-seam maintenance timing |
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| CN201610438578.4A CN106126790B (en) | 2016-06-17 | 2016-06-17 | Appraisal procedure based on concrete elastic-plastic model track interlayer off-seam maintenance timing |
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Cited By (5)
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| CN106845014A (en) * | 2017-02-22 | 2017-06-13 | 中南大学 | A kind of computational methods of track plates thermal cracking width |
| CN108563828A (en) * | 2018-03-12 | 2018-09-21 | 北京交通大学 | A kind of point tongue longitudinal crack expansion process analysis method and maintenance process |
| CN109614674A (en) * | 2018-11-28 | 2019-04-12 | 武汉大学 | A kind of ballastless track of high-speed railway interlayer off-seam is come to nothing dynamic testing method |
| CN110936978A (en) * | 2019-12-13 | 2020-03-31 | 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 |
| CN115964920A (en) * | 2023-03-16 | 2023-04-14 | 武汉大学 | Method for estimating void length of CA mortar bed of ballastless track based on finite element simulation |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106845014A (en) * | 2017-02-22 | 2017-06-13 | 中南大学 | A kind of computational methods of track plates thermal cracking width |
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| CN108563828A (en) * | 2018-03-12 | 2018-09-21 | 北京交通大学 | A kind of point tongue longitudinal crack expansion process analysis method and maintenance process |
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| CN109614674A (en) * | 2018-11-28 | 2019-04-12 | 武汉大学 | A kind of ballastless track of high-speed railway interlayer off-seam is come to nothing dynamic testing 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 |
| CN110936978A (en) * | 2019-12-13 | 2020-03-31 | 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 |
| 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 |
| CN115964920A (en) * | 2023-03-16 | 2023-04-14 | 武汉大学 | Method for estimating void length of CA mortar bed of ballastless track based on finite element simulation |
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