CN110472337A - Asphalt pavement structure force analysis method under different copulation state between laminates - Google Patents
Asphalt pavement structure force analysis method under different copulation state between laminates Download PDFInfo
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- CN110472337A CN110472337A CN201910756187.0A CN201910756187A CN110472337A CN 110472337 A CN110472337 A CN 110472337A CN 201910756187 A CN201910756187 A CN 201910756187A CN 110472337 A CN110472337 A CN 110472337A
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Abstract
The present invention provides a kind of method of asphalt pavement structure force analysis under different copulation state between laminates, belongs to asphalt pavement technique field.Solve the problems, such as there is error for pavement structure modeling inaccuracy, the result of different copulation state between laminates at present.The present invention has the asphalt pavement structure initial model for determining gradation using each layer of discrete element Software Create；Then, corresponding boundary condition, the contact model in road surface structare layer between the physical parameter of material, unit grain are set, discrete element mechanics analysis model is established；Finally, the bituminous pavement under different bonding states is loaded using servomechanism simulating vehicle load, tensile stress, shear stress, stretching strain, road surface deflection Value Data at the monitoring each structure interlayer loading position in road surface, stress data comparison diagram is drawn, asphalt pavement structure stress condition under different copulation state between laminates is analyzed.Method provided by the invention is intuitively easy, calculates accurate data, suitable for simulating to the various bituminous pavements under different interlayer states.
Description
Technical field
The present invention is asphalt pavement structure force analysis method under different copulation state between laminates, belongs to asphalt pavement technique neck
Domain.
Background technique
In recent years, rapid development is built in the highway transportation in China, due to bituminous highway have flatness is high, the construction time is short,
The features such as easy to maintain, becomes main road surface and builds type.China's bituminous pavement design is managed using elastic layered design
By bituminous pavement is generally made of surface layer, base, underlayment and roadbed, the material group that different interlayers are used according to function difference
At different.There is the performance much higher than cement concrete pavement based on asphalt material, surface material is mainly mixed by pitch
Material is formed according to different mixture ratio mixing, is generally divided into upper, middle and lower-ranking.Again since semi-rigid cement concrete base has
The strong feature of bearing capacity height, low cost, non-deformability, base and underlayment are mainly using cement concrete material.
The adhesive that different interlayers combine use is different, and sticking layer oil is generally used between asphalt surface course, in asphalt surface course and half
Priming oil is generally used between rigid base.The degree of cohering for assuming to think different interlayers in the design is ideal, entire road surface
Structure is considered as continuous layer structure.But a large amount of engineering practice shows the Coating combination between surface layer and base not
It is ideal state in design, agrees with even if the interlayer c ohesion between surface layer inside is also not absolute.Not due to interlayer c ohesion
It is commonplace that the diseases problem such as cracking, cutting slippage, track occurs in bituminous pavement caused by good problem.Statistics indicate that in interlayer
It can make the service life reduction 80% or so of bituminous pavement in conjunction with undesirable road surface, Coating combination has become bituminous pavement and transports safely
One big hidden danger of battalion.
It is current studies have shown that even if not considering that Coating combination situation caused by construction problem is bad, with regard to material itself
Speech, current interlayer c ohesion material cannot guarantee that different interlayer good combinations.First is that surface layer and base material are organic respectively
Material and inorganic material, the two cohere it is congenital have difficulties, second is that the material breakage that is likely to occur under environmental factor effect, such as
Prolonged fatigue rupture, moisture intrusion structure sheaf etc..So researcher is also in addition to carrying out new exploration in terms of material
Be dedicated to analyzing the interlayer mechanics under different copulation state between laminates, solve the problems, such as so as to theoretically finding method or
It is the influence for slowing down this problem road pavement structure.
For the copulation state between laminates of bituminous pavement, bituminous pavement is mainly divided into and continuously, partly connecting completely by current research
Continue, be completely smooth three kinds of states.Statement for three kinds of states, by define the coefficient of friction of each interlayer or cohere coefficient or
Person's slip coefficient this kind of interlayer contact coefficient characterizes.The bituminous pavement mechanics analyzed under different copulation state between laminates is rung
It answers, is analyzed by data such as the maximal bend stress at the bottom, road surface deflection, course bottom tensile strains at interlaminar shear stress, load center.
The existing many researchs of the influence of domestic and international road pavement Coating combination situation road pavement stress, currently for different interlayers
The research of asphalt pavement structure force analysis mainly uses following two method under bonding state:
The first is the asphalt pavement structure bonding state of multilayer to be described using mechanical model, and then calculate and analyze and is different
Road surface stress condition under bonding state.It cannot be a kind of discrete complexity in view of bituminous pavement using such theoretical method
Structure also lacks the analysis of corresponding feature to current diversified pavement structure, thus theory and method research be it is highly difficult,
It is difficult to Accurate Analysis.
Second is analysis of finite element by numerical simulation method, this is also currently used a kind of most commonly used method.By having
Limit meta software establishes continuous asphalt pavement structural layer shape model, assign interlayer it is different cohere coefficient or different friction systems
Number studies the variation of the stress characteristic of pavement structure to simulate copulation state between laminates accordingly.It is this to be reduced to challenge
The method of limited homogeneous unit resolves is a kind of very efficiently method, but equally lacks road pavement structure and correctly state, road
The combination variation of face structure interlayer nor what a simple coefficient can indicate, structure interlayer there are local damage can
Energy.So the result of finite element modelling be also it is not accurate enough, limitation is very big.
Discrete element particle stream method is a kind of method for numerical simulation for being good at simulating particulate species material characteristics, is different from limited
It is continuous homogeneous way that first method, which simplifies material, can simulate granular materials of various shapes with particulate units, and pass through
Contact model defines the contact performance of each storeroom, and the simulation of road pavement labyrinth to the full extent may be implemented.It is discrete
In addition to can satisfy the simulation in contact, the Micromechanics that can also monitor arbitrary interface in load action drag becomes first method
Change, facilitating us, accurately road pavement structure carries out force analysis.
Bituminous pavement is a kind of layer structure of complexity, the bonding state road pavement between surface layer and surface layer, surface layer and base
Service life have a significant impact, many disease problems of the bad bring of Coating combination make road surface stress abnormal, interlayer structure
Damage, traffic safety are also on the hazard.The existing bituminous pavement force analysis under different copulation state between laminates is mainly adopted
It is limited element analysis technique, using finite element software simulation, there is also its inherent shortcomings, since finite element analysis is based on company
Continuous mechanics principle establishes asphalt pavement structure model, is unable to characterize out the material property of bituminous pavement porous media,
The geometrical property of aggregate contact cannot be changed, modeling unit is single, and ignores the presence of thermal contact resistance, and these problems to adopt
It is lacked persuasion with the calculated result that finite element method obtains.Therefore the result of analysis is also inaccuracy.
For current status, the present patent application uses Discrete-parcel method, by establishing the discrete of asphalt pavement structural layer
Meta-model sets particle characteristics and contact model, by changing the contact coefficient of Coating combination, to simulate different Coating combinations
State, then apply external loads, monitoring asphalt pavement structural layer mechanical response under load action records at load position
The Mechanical Data at each layer bottom analyzes the asphalt pavement structure stress condition under different copulation state between laminates.Due to discrete meta software
Good adaptability is simulated to various granular materials, simulation calculating can be carried out to various types bituminous pavement, there is very big push away
Wide value.
Summary of the invention
(1) technical problem
Object of the present invention is to propose asphalt pavement structure force analysis method under a kind of different copulation state between laminates, this method
By establishing discrete element analysis, the bituminous pavement model of different copulation state between laminates is simulated, is analyzed under same load action,
The stressing influence of bituminous pavement under different copulation state between laminates, solving current finite element modeling, to be unable to characterize bituminous pavement porous
Discontinuous structure feature cannot change aggregate contact geometrical property, ignore the problems such as thermal contact resistance.
(2) technical solution
It is unable to characterize the porous discontinuous structure feature of bituminous pavement in order to solve current finite element modeling, cannot change and gather materials
Contact geometry characteristic ignores the problems such as thermal contact resistance, and the present invention provides asphalt pavement structure under a kind of different copulation state between laminates
Force analysis method.Firstly, such as Fig. 1, using the Discrete Element introductory die of discrete element numerical simulation software building bituminous pavement
Type, the match ratio for setting each layer pitch in road surface according to set gradation, gathering materials；Secondly, query material data, setting each group is become a useful person
Expect physical parameter, the contact model between asphalt mastic is set and is gathered materials；Finally, being applied using servomechanism in the upper surface of model
Vehicular load, the coefficient of friction resistance by changing different structure interlayer act on same respectively to characterize different copulation state between laminates
Load monitors the stress data in loading procedure in asphalt pavement structural layer, record each tensile stress at the bottom of layer, shear stress, deflection value,
The data such as stretching strain analyze the stressing influence situation of bituminous pavement under different copulation state between laminates.
(3) beneficial effect
Bituminous pavement has been widely used in China at present, the disease problem that bituminous pavement occurs, in addition to apply
Work is horizontal, design factor has outside the Pass, and the variation of interfacial combining state of asphalt pavement can also be used safely to road surface and bring hidden danger.Have
Statistics indicate that the bad meeting of road surface Coating combination so that bituminous pavement reduced service life 80%.In this case, to difference
The stress condition research of bituminous pavement interlayer is imperative under copulation state between laminates, so that the mechanism of action of road pavement damage has more
Deep understanding.
It compares with previous research method, the Discrete-parcel method that the present invention uses has more accurately simulation effect, energy
Enough stress datas for preferably monitoring bituminous pavement interlayer in microcosmic point.Also, for other kinds of pavement structure, this hair
It is bright preferably to simulate, it can deeply solve mechanics of the bituminous pavement of different composed structures under different interlayer states and ring
It answers, thus has very big promotional value.
Detailed description of the invention
Fig. 1 asphalt pavement structure schematic diagram
1- gathers materials surface layer 6- cutting optimal in 2- asphalt mastic 3- vehicular load 4- upper layer 5-
Specific embodiment
The present invention proposes asphalt pavement structure force analysis method under a kind of different copulation state between laminates, specific implementation step
It is as follows:
(1) there is the asphalt pavement structure model for determining gradation using each layer of Discrete Element software building, ordered with block
It enables and particulate units composition irregular shape expression is gathered materials, remaining circular granular unit is considered as asphalt mastic, definitions particles collection
Block made of conjunction will not rupture, and the circular granular close-packed arrays of each composition material of gravity constraint are arranged；
(2) physical parameter of pavement structure layers of material is set in discrete element mechanical analysis module, and selected viscoplasticity connects
It touch type and coheres inside model characterization asphalt mortar, bituminous mortar and asphalt mortar, bituminous mortar and the contact between gathering materials, and is set respectively by group in parallel
The coefficient of friction resistance for determining each interlayer of bituminous pavement establishes the discrete element mechanics analysis model of asphalt pavement structure；
(3) using the mechanical function of the servomechanism simulating vehicle load road pavement structure of discrete meta software, in model table
Face applies action time and the identical vehicular load of frequency, changes the interlayer coefficient of friction resistance, to the drip under different copulation state between laminates
Green road surface carries out numerical simulation calculation respectively；
(4) interlaminar shear stress under the monitoring record difference interlayer coefficient of friction resistance under Vehicle Load, tensile stress, stretching strain
With road surface deflection value, drawing data comparison diagram analyzes the influence under different copulation state between laminates to asphalt pavement structure stress.
Claims (1)
1. asphalt pavement structure force analysis method under a kind of difference copulation state between laminates, it is characterised in that the specific step of this method
It is rapid as follows:
(1) there is the asphalt pavement structure initial model for determining gradation using each layer of Discrete Element software building, ordered with block
It enables and particulate units composition irregular shape expression is gathered materials, remaining circular granular unit is considered as asphalt mastic, definitions particles collection
Block made of conjunction will not rupture, and the circular granular close-packed arrays of each composition material of gravity constraint are arranged；
(2) physical parameter of pavement structure layers of material is set in discrete element mechanical analysis module, selectes viscoelastic contact mould
It type and is cohered inside model characterization asphalt mortar, bituminous mortar in parallel and asphalt mortar, bituminous mortar and the contact between gathering materials, and drip is set separately by group
The coefficient of friction resistance of the green each interlayer in road surface, establishes the discrete element mechanics analysis model of asphalt pavement structure；
(3) it using the mechanical function of the servomechanism simulating vehicle load road pavement structure of discrete meta software, is applied in model surface
Add action time and the identical vehicular load of frequency, changes the interlayer coefficient of friction resistance, to the asphalt road under different copulation state between laminates
Face carries out numerical simulation calculation respectively；
(4) interlaminar shear stress, tensile stress, stretching strain and the road under the monitoring record difference interlayer coefficient of friction resistance under Vehicle Load
Table deflection value, drawing data comparison diagram analyze the influence under different copulation state between laminates to asphalt pavement structure stress.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693380A (en) * | 2020-07-15 | 2020-09-22 | 合肥工业大学 | Asphalt pavement fatigue damage prediction method based on finite elements |
| CN112131805A (en) * | 2020-10-12 | 2020-12-25 | 南京林业大学 | Double-layer porous asphalt pavement drainage characteristic analysis method based on discrete element method |
| CN112668075A (en) * | 2020-12-18 | 2021-04-16 | 南阳理工学院 | Mechanical response analysis method for permeable pavement structure under vehicle load effect |
| CN112949117A (en) * | 2021-02-02 | 2021-06-11 | 天津城建大学 | Three-dimensional strain analysis method for asphalt pavement based on multi-dimensional parameters |
| CN113447342A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Method for identifying modulus of each layer and contact state between layers of asphalt pavement |
| CN114184503A (en) * | 2021-12-06 | 2022-03-15 | 山东高速建设管理集团有限公司 | Device and method for intelligently monitoring interlayer state of asphalt pavement |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111693380A (en) * | 2020-07-15 | 2020-09-22 | 合肥工业大学 | Asphalt pavement fatigue damage prediction method based on finite elements |
| CN112131805A (en) * | 2020-10-12 | 2020-12-25 | 南京林业大学 | Double-layer porous asphalt pavement drainage characteristic analysis method based on discrete element method |
| CN112668075A (en) * | 2020-12-18 | 2021-04-16 | 南阳理工学院 | Mechanical response analysis method for permeable pavement structure under vehicle load effect |
| CN112949117A (en) * | 2021-02-02 | 2021-06-11 | 天津城建大学 | Three-dimensional strain analysis method for asphalt pavement based on multi-dimensional parameters |
| CN112949117B (en) * | 2021-02-02 | 2022-08-12 | 天津城建大学 | Three-dimensional strain analysis method for asphalt pavement based on multi-dimensional parameters |
| CN113447342A (en) * | 2021-06-28 | 2021-09-28 | 哈尔滨工业大学 | Method for identifying modulus of each layer and contact state between layers of asphalt pavement |
| CN113447342B (en) * | 2021-06-28 | 2022-05-10 | 哈尔滨工业大学 | Method for identifying modulus of each layer and contact state between layers of asphalt pavement |
| CN114184503A (en) * | 2021-12-06 | 2022-03-15 | 山东高速建设管理集团有限公司 | Device and method for intelligently monitoring interlayer state of asphalt pavement |
| CN114184503B (en) * | 2021-12-06 | 2024-03-19 | 山东高速建设管理集团有限公司 | Device and method for intelligently monitoring interlayer state of asphalt pavement |
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