CN109117587A - A kind of railroad track ballast track bed THICKNESS CALCULATION method and system - Google Patents
A kind of railroad track ballast track bed THICKNESS CALCULATION method and system Download PDFInfo
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- CN109117587A CN109117587A CN201811044048.7A CN201811044048A CN109117587A CN 109117587 A CN109117587 A CN 109117587A CN 201811044048 A CN201811044048 A CN 201811044048A CN 109117587 A CN109117587 A CN 109117587A
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- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
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Abstract
The invention discloses a kind of railroad track ballast track bed THICKNESS CALCULATION method and system.This method comprises: obtaining the design parameter of railroad track；Wheel load is designed according to calculation of design parameters and designs the equivalent number of wheel load effect；Survey parameter with obtaining；It includes the elasticity modulus of railway roadbed, the type of subgrade soils, thickness, elasticity modulus and compression strength that parameter is surveyed on ground；Design requirement is obtained, and allowable stress and allowable strain are determined according to design requirement；Parameter is surveyed in base area and allowable stress calculates roadbed deviatoric stress；According to design wheel load, equivalent number, allowable strain and the roadbed deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor of design wheel load effect；According to the plastic strain factor and the accumulative sedimentation factor, the thickness of railroad track ballast track bed is determined.The present invention has comprehensively considered plastic strain and cumulative settling of the roadbed under the action of cyclic load, is greatly reduced in railway the generation of the disease of " railway ballast bag " and " subgrade heave ".
Description
Technical field
The present invention relates to track engineering design fields, more particularly to a kind of railroad track ballast track bed THICKNESS CALCULATION method
And system.
Background technique
Ballast track design of substructure is generally the thickness that railway roadbed is chosen according to specification now, vertical further according to roadbed
Maximum stress is less than roadbed allowable stress to verify the reasonability of railway roadbed design thickness, but this design method has ignored railway roadbed
With deformation of roadbed under the action of a large amount of cyclic loads, two common diseases of roadbed are another one is progressive shear destruction
Kind is excessively to be plastically deformed, and excessively disease common caused by plastic deformation has " railway ballast bag ", as " railway ballast bag " is further sent out
Exhibition roadbed side can swell, and prevent disease is the plastic strain and plastic deformation for controlling the accumulation of roadbed at all.
Summary of the invention
Deficiency present in thickness of ballast bed design method of the present invention for current Ballast track, has comprehensively considered roadbed and has existed
Plastic strain and cumulative settling under the action of cyclic load, provide a kind of railroad track ballast track bed THICKNESS CALCULATION method and
System solves the disease as caused by the excessive plastic strain of roadbed and cumulative settling, has stronger practicability and extensive work
Cheng Yunyong prospect.
To achieve the above object, the present invention provides following schemes:
A kind of railroad track ballast track bed THICKNESS CALCULATION method, which comprises
Obtain the design parameter of railroad track；The design parameter include the quiet wheel load of locomotive, speed, wheel diameter and
Design traffic volume；
Wheel load is designed according to the calculation of design parameters and designs the equivalent number of wheel load effect；
Survey parameter with obtaining；Surveying parameter describedly includes the elasticity modulus of railway roadbed, the type of subgrade soils, thickness, springform
Amount and compression strength；
Design requirement is obtained, and allowable stress and allowable strain are determined according to the design requirement；
Roadbed deviatoric stress is calculated according to parameter and the allowable stress is surveyed describedly；
According to the design wheel load, equivalent number, the allowable strain and the roadbed of the design wheel load effect
Deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor；
According to the plastic strain factor and the accumulative sedimentation factor, the thickness of railroad track ballast track bed is determined.
Optionally, described according to the plastic strain factor and the accumulative sedimentation factor, determine that railroad track has the tiny fragments of stone, coal, etc.
The thickness of railway roadbed, specifically includes:
Three-dimensional vehicle-track-roadbed numerical finite meta-model is established by numerical method；
The roadbed dynamic stress response under different conditions is calculated according to the finite element model；Described in the different conditions expression
The design parameter of railroad track and the different differences for surveying parameter describedly；
According to the roadbed dynamic stress response, the plastic strain factor and the accumulative sedimentation factor, establishes and correspond to
Relational database；The corresponding relation database table is the plastic strain factor and the accumulative sedimentation factor and the iron
The corresponding relationship of the thickness of rail road ballast track bed；
The thickness of railroad track ballast track bed is determined according to the corresponding relation database.
Optionally, described that wheel load is designed according to the calculation of design parameters and designs the equivalent number of wheel load effect, meter
Calculate formula are as follows:
Wherein, PDesignTo design wheel load；N is the equivalent number for designing wheel load effect；PQuiet wheelFor quiet wheel load；DWheelIt is straight for wheel
Diameter；VVehicleFor speed；TDesignFor design traffic volume.
It is optionally, described to calculate roadbed deviatoric stress, calculation formula according to surveying parameter and the allowable stress describedly are as follows:
In formula, εAllowFor allowable stress；σResistance to compressionFor compression strength；A, b, m are roadbed material coefficient, and high plastic clay takes respectively
1.2,0.18,2.4；Inductile clay takes 1.1,0.16,2 respectively；Low compressibility silt takes 0.84,0.13,2 respectively；High compression
Property silt takes 0.64,0.1,1.7 respectively.
Optionally, it is described according to it is described design wheel load, it is described design wheel load effect equivalent number, the allowable strain with
And the roadbed deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor, calculation formula are as follows:
In formula, A is area constant, and usual value is 1m2；L is length constant, and usual value is 1m；ρAllowFor during the design
The acceptable setting of base course.
A kind of railroad track ballast track bed THICKNESS CALCULATION system, the system comprises:
Design parameter obtains module, for obtaining the design parameter of railroad track；The design parameter includes the quiet of locomotive
Wheel load, speed, wheel diameter and design traffic volume；
First computing module, for designing wheel load according to the calculation of design parameters and designing equivalent time of wheel load effect
Number；
Parameter acquisition module is surveyed on ground, for obtaining surveys parameter；Surveying parameter describedly includes the elasticity modulus of railway roadbed, roadbed
Type, thickness, elasticity modulus and the compression strength of soil；
Determining module determines allowable stress and allowable strain for obtaining design requirement, and according to the design requirement；
Second computing module, for calculating roadbed deviatoric stress according to surveying parameter and the allowable stress describedly；
Third computing module, for according to the equivalent number of the design wheel load, the design wheel load effect, described allow
Deformation and the roadbed deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor；
Thickness determining module, for determining rail according to the plastic strain factor and the accumulative sedimentation factor
The thickness of road ballast track bed.
Optionally, the thickness determining module specifically includes:
Modeling unit, for establishing three-dimensional vehicle-track-roadbed numerical finite meta-model by numerical method；
Computing unit, for calculating the roadbed dynamic stress response under different conditions according to the finite element model；It is described not
With state indicate the railroad track design parameter and the different differences for surveying parameter describedly；
Database unit, for according to the roadbed dynamic stress response, the plastic strain factor and described tired
The meter sedimentation factor, establishes corresponding relation database；The corresponding relation database table is the plastic strain factor and described
The corresponding relationship of the thickness of the accumulative sedimentation factor and the railroad track ballast track bed；
Thickness determination unit, for determining the thickness of railroad track ballast track bed according to the corresponding relation database.
Compared with prior art, the present invention has following technical effect that the present invention is designed according to the calculation of design parameters
Wheel load and the equivalent number of design wheel load effect；Roadbed deviatoric stress is calculated according to parameter and the allowable stress is surveyed describedly；
According to the design wheel load, equivalent number, the allowable strain and the roadbed deviatoric stress meter of the design wheel load effect
Calculate the plastic strain factor and the accumulative sedimentation factor；Then according to the plastic strain factor and the accumulative sedimentation factor,
Determine the thickness of railroad track ballast track bed.The present invention comprehensively considered plastic strain of roadbed under the action of cyclic load and
Cumulative settling is greatly reduced in railway the generation of the disease of " railway ballast bag " and " subgrade heave ", has stronger practicability,
Application prospect is extensive.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without any creative labor, can also be according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the flow chart of railroad track of embodiment of the present invention ballast track bed THICKNESS CALCULATION method；
Fig. 2 is the structural block diagram of railroad track of embodiment of the present invention ballast track bed THICKNESS CALCULATION system.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing and specific real
Applying mode, the present invention is described in further detail.
As shown in Figure 1, a kind of railroad track ballast track bed THICKNESS CALCULATION method includes:
Step 101: obtaining the design parameter of railroad track；The design parameter includes quiet wheel load, speed, the wheel of locomotive
Diameter and design traffic volume.
Step 102: wheel load being designed according to the calculation of design parameters and designs the equivalent number of wheel load effect.
Wherein, PDesignTo design wheel load；N is the equivalent number for designing wheel load effect；PQuiet wheelFor quiet wheel load；DWheelIt is straight for wheel
Diameter；VVehicleFor speed；TDesignFor design traffic volume.
Step 103: surveying parameter with obtaining；Surveying parameter describedly includes the elasticity modulus of railway roadbed, the type of subgrade soils, thickness
Degree, elasticity modulus and compression strength.
Step 104: obtaining design requirement, and allowable stress and allowable strain are determined according to the design requirement.
Step 105: calculating roadbed deviatoric stress according to parameter and the allowable stress is surveyed describedly.
In formula, εAllowFor allowable stress；σResistance to compressionFor compression strength；A, b, m are roadbed material coefficient, and high plastic clay takes respectively
1.2,0.18,2.4；Inductile clay takes 1.1,0.16,2 respectively；Low compressibility silt takes 0.84,0.13,2 respectively；High compression
Property silt takes 0.64,0.1,1.7 respectively.
Step 106: according to it is described design wheel load, it is described design wheel load effect equivalent number, the allowable strain and
The roadbed deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor.
In formula, A is area constant, and usual value is 1m2；L is length constant, and usual value is 1m；ρAllowFor during the design
The acceptable setting of base course.
Step 107: according to the plastic strain factor and the accumulative sedimentation factor, determining railroad track ballast track bed
Thickness.
It is set up by numerical method and establishes three-dimensional vehicle-track-roadbed numerical finite meta-model, calculate different locomotives
Axis weight and speed, different Ballast elastic modulus, different roadbed elasticity modulus, different roadbed great soil group type, different thickness of ballast bed, difference
Roadbed dynamic stress response size under roadbed thickness effect.It is answered according to a large amount of Mathematical Statistics Analysis and in conjunction with aforementioned gained plasticity
Variable factor (I sedimentation) and the cumulative settling factor (I sedimentation) two relationships, foundation consider different Ballast elastic modulus, different roadbed
Elasticity modulus, different roadbed great soil group type, the railway roadbed design thickness under different roadbed thickness effect and plastic strain because and accumulation it is heavy
The database of the factor drops.It searches corresponding thickness of ballast bed respectively according to the plastic strain factor and the cumulative settling factor and compares size,
Taking the greater is design thickness.
The specific embodiment provided according to the present invention, the invention discloses following technical effects: the present invention, which is directed to, currently to be had
Deficiency present in the thickness of ballast bed design method of tiny fragments of stone, coal, etc. track has comprehensively considered plasticity of roadbed under the action of cyclic load and has answered
Change and cumulative settling provide a kind of railroad track ballast track bed THICKNESS CALCULATION method and system, solve excessively to mould due to roadbed
Property strain and cumulative settling caused by disease, have stronger practicability and extensive engineering application prospect.
As shown in Fig. 2, a kind of railroad track ballast track bed THICKNESS CALCULATION system, the system comprises:
Design parameter obtains module 201, for obtaining the design parameter of railroad track；The design parameter includes locomotive
Quiet wheel load, speed, wheel diameter and design traffic volume.
First computing module 202, for according to the calculation of design parameters design wheel load and design wheel load effect etc.
Imitate number.
Parameter acquisition module 203 is surveyed on ground, for obtaining surveys parameter；Survey describedly elasticity modulus that parameter includes railway roadbed,
Type, thickness, elasticity modulus and the compression strength of subgrade soils.
Determining module 204 for obtaining design requirement, and determines allowable stress according to the design requirement and allows to become
Shape.
Second computing module 205, for calculating roadbed deviatoric stress according to surveying parameter and the allowable stress describedly.
Third computing module 206, for the equivalent number, described according to the design wheel load, the design wheel load effect
Allowable strain and the roadbed deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor.
Thickness determining module 207, for determining railway according to the plastic strain factor and the accumulative sedimentation factor
The thickness of track ballast track bed.
The thickness determining module 207 specifically includes:
Modeling unit, for establishing three-dimensional vehicle-track-roadbed numerical finite meta-model by numerical method；
Computing unit, for calculating the roadbed dynamic stress response under different conditions according to the finite element model；It is described not
With state indicate the railroad track design parameter and the different differences for surveying parameter describedly；
Database unit, for according to the roadbed dynamic stress response, the plastic strain factor and described tired
The meter sedimentation factor, establishes corresponding relation database；The corresponding relation database table is the plastic strain factor and described
The corresponding relationship of the thickness of the accumulative sedimentation factor and the railroad track ballast track bed；
Thickness determination unit, for determining the thickness of railroad track ballast track bed according to the corresponding relation database.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is said referring to method part
It is bright.
Used herein a specific example illustrates the principle and implementation of the invention, and above embodiments are said
It is bright to be merely used to help understand method and its core concept of the invention；At the same time, for those skilled in the art, foundation
Thought of the invention, there will be changes in the specific implementation manner and application range.In conclusion the content of the present specification is not
It is interpreted as limitation of the present invention.
Claims (7)
1. a kind of railroad track ballast track bed THICKNESS CALCULATION method, which is characterized in that the described method includes:
Obtain the design parameter of railroad track；The design parameter includes quiet wheel load, speed, wheel diameter and the design of locomotive
The volume of traffic；
Wheel load is designed according to the calculation of design parameters and designs the equivalent number of wheel load effect；
Survey parameter with obtaining；Survey describedly parameter include the elasticity modulus of railway roadbed, the type of subgrade soils, thickness, elasticity modulus with
And compression strength；
Design requirement is obtained, and allowable stress and allowable strain are determined according to the design requirement；
Roadbed deviatoric stress is calculated according to parameter and the allowable stress is surveyed describedly；
It is answered partially according to equivalent number, the allowable strain and the roadbed of the design wheel load, the design wheel load effect
Power computational plasticity strain factor and the accumulative sedimentation factor；
According to the plastic strain factor and the accumulative sedimentation factor, the thickness of railroad track ballast track bed is determined.
2. ballast track bed THICKNESS CALCULATION method according to claim 1, which is characterized in that described according to the plastic strain
The factor and the accumulative sedimentation factor, determine the thickness of railroad track ballast track bed, specifically include:
Three-dimensional vehicle-track-roadbed numerical finite meta-model is established by numerical method；
The roadbed dynamic stress response under different conditions is calculated according to the finite element model；The different conditions indicate the railway
The design parameter of track and the different differences for surveying parameter describedly；
According to the roadbed dynamic stress response, the plastic strain factor and the accumulative sedimentation factor, corresponding relationship is established
Database；The corresponding relation database table is the plastic strain factor and the accumulative sedimentation factor and the rail
The corresponding relationship of the thickness of road ballast track bed；
The thickness of railroad track ballast track bed is determined according to the corresponding relation database.
3. ballast track bed THICKNESS CALCULATION method according to claim 1, which is characterized in that described according to the design parameter
It calculates design wheel load and designs the equivalent number of wheel load effect, calculation formula are as follows:
Wherein, PDesignTo design wheel load；N is the equivalent number for designing wheel load effect；PQuiet wheelFor quiet wheel load；DWheelFor wheel diameter；VVehicle
For speed；TDesignFor design traffic volume.
4. ballast track bed THICKNESS CALCULATION method according to claim 1, which is characterized in that described according to surveying parameter describedly
Roadbed deviatoric stress, calculation formula are calculated with the allowable stress are as follows:
In formula, εAllowFor allowable stress；σResistance to compressionFor compression strength；A, b, m are roadbed material coefficient, high plastic clay takes 1.2 respectively,
0.18,2.4；Inductile clay takes 1.1,0.16,2 respectively；Low compressibility silt takes 0.84,0.13,2 respectively；High-compressibility powder
Soil takes 0.64,0.1,1.7 respectively.
5. ballast track bed THICKNESS CALCULATION method according to claim 1, which is characterized in that described to be taken turns according to the design
It carries, equivalent number, the allowable strain and the roadbed deviatoric stress computational plasticity strain factor of the design wheel load effect
And the accumulative sedimentation factor, calculation formula are as follows:
In formula, A is area constant, and usual value is 1m2；L is length constant, and usual value is 1m；ρAllowFor during the design roadbed
The acceptable setting of layer.
6. a kind of railroad track ballast track bed THICKNESS CALCULATION system, which is characterized in that the system comprises:
Design parameter obtains module, for obtaining the design parameter of railroad track；The design parameter include locomotive quiet wheel load,
Speed, wheel diameter and design traffic volume；
First computing module, for designing wheel load according to the calculation of design parameters and designing the equivalent number of wheel load effect；
Parameter acquisition module is surveyed on ground, for obtaining surveys parameter；Surveying parameter describedly includes the elasticity modulus of railway roadbed, subgrade soils
Type, thickness, elasticity modulus and compression strength；
Determining module determines allowable stress and allowable strain for obtaining design requirement, and according to the design requirement；
Second computing module, for calculating roadbed deviatoric stress according to surveying parameter and the allowable stress describedly；
Third computing module, for equivalent number, the allowable strain according to the design wheel load, the design wheel load effect
And the roadbed deviatoric stress computational plasticity strain factor and the accumulative sedimentation factor；
Thickness determining module, for determining that railroad track has according to the plastic strain factor and the accumulative sedimentation factor
The thickness of ballast bed.
7. ballast track bed THICKNESS CALCULATION system according to claim 6, which is characterized in that the thickness determining module is specific
Include:
Modeling unit, for establishing three-dimensional vehicle-track-roadbed numerical finite meta-model by numerical method；
Computing unit, for calculating the roadbed dynamic stress response under different conditions according to the finite element model；The difference shape
State indicate the railroad track design parameter and the different differences for surveying parameter describedly；
Database unit, for according to the roadbed dynamic stress response, the plastic strain factor and described accumulative heavy
The factor is dropped, corresponding relation database is established；The corresponding relation database table is the plastic strain factor and described accumulative
Settle the corresponding relationship of the thickness of the factor and the railroad track ballast track bed；
Thickness determination unit, for determining the thickness of railroad track ballast track bed according to the corresponding relation database.
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| CN113062148A (en) * | 2021-03-30 | 2021-07-02 | 武汉理工大学 | High-speed railway bed surface layer thickness flexibility design method |
| CN113076584A (en) * | 2021-04-12 | 2021-07-06 | 山西省工业设备安装集团有限公司 | BIM-based electromechanical construction method for corridor of subway station equipment area |
| CN113486497A (en) * | 2021-06-11 | 2021-10-08 | 西南交通大学 | Method and device for calculating roadbed loose paving thickness |
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| CN113076584A (en) * | 2021-04-12 | 2021-07-06 | 山西省工业设备安装集团有限公司 | BIM-based electromechanical construction method for corridor of subway station equipment area |
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Application publication date: 20190101 |