CN105512436A - Bituminous mixture compaction simulation method based on discrete elements - Google Patents
Bituminous mixture compaction simulation method based on discrete elements Download PDFInfo
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- CN105512436A CN105512436A CN201610027660.8A CN201610027660A CN105512436A CN 105512436 A CN105512436 A CN 105512436A CN 201610027660 A CN201610027660 A CN 201610027660A CN 105512436 A CN105512436 A CN 105512436A
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- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/30—Circuit design
- G06F30/36—Circuit design at the analogue level
- G06F30/367—Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
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- G—PHYSICS
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Abstract
The invention discloses a bituminous mixture compaction simulation method based on discrete elements. The method comprises the steps that a prescribed space region is generated through a 'wall' command in PFC<3D> software, and the space region is randomly filled with a particle system composed of coarse aggregates and bituminous mortar; partial bituminous mortar is randomly deleted; corresponding contact types are given to the interior of the coarse aggregates, the interior of the bituminous mortar and the space between the coarse aggregates and the bituminous mortar in a bituminous mixture; a 'clump', formed by gathering basic unit particles, in the PFC<3D> software is set to serve as a rolling wheel of a road roller, and the static pressure action on the bituminous mixture is achieved through rolling wheels of the road roller under the action of gravity; excitation force is given to the 'clump', the excitation force of a 'clump' system is coupled with the gravity, and vibrating compaction action is simulated; compaction of compaction road rolling wheels to the bituminous mixture is controlled through fish language programming. The method is easy and convenient to use, economical and effective and has certain significance to construction of a bituminous mixture pavement.
Description
Technical field
The present invention relates to asphalt discrete element technology of numerical simulation, particularly relate to a kind of asphalt compaction simulation method based on discrete element.
Background technology
The compacting of asphalt is the critical process of pavement construction.Large quantifier elimination shows: the early damage on road surface is directly related with the compaction quality on road surface.If compactness is not enough, the voidage on road surface is bigger than normal, and rainwater oozes people's pavement structure through space inner, and the early damage such as Moisture Damage and rut easily occurs on road surface.If compactness is too large, cause pavement structure internal voids too small, often find the phenomenon such as bellding and unstability under the high temperature conditions.The very big concern of the material impact of pavement compaction to road mechanical property also result in road work person, wherein expands deep research to the compacting mechanism of asphalt and achieves certain achievement.Such as analyze the compacting mechanism of vibroll, rubber-tyred roller etc., study combination and the number of rolling of various compacting machinary, effectively roll the time etc.But these researchs are all the presentations based on macroscopic view, non-immediate, and experimentation cost is high, and spended time is long, inherently deeply cannot understand the compacting mechanism of asphalt.
Discrete method based on molecular dynamics can study the essential characteristic of particulate matter from microscopic parameter.Asphalt is a kind of typical multiphase particle material, in recent years, adopts discrete element to set up the mechanical property of virtual test Research on Asphalt Mixture both at home and abroad.But, use the research of the compacting mechanism of discrete element Research on Asphalt Mixture less, existing two dimensional model just represents with simple disk and gathers materials, the viscoelastic of asphalt is moulded characteristic and is just simply represented with these Elastic Contact models such as contact bonding or paralleling bindings, only can simple analog static pressure process, truly cannot reflect the compacting mechanism of asphalt.
Summary of the invention
The object of the invention is to overcome above-mentioned the deficiencies in the prior art, a kind of asphalt compaction simulation method based on discrete element is provided, asphalt compacting mechanism can be reflected from microscopic parameter.
For achieving the above object, the technical solution used in the present invention is:
Based on an asphalt compaction simulation method for discrete element, comprise the following steps:
Step 1, uses PFC
3D" wall " order in software generates given area of space, and in this region, fill the granular system be made up of coarse aggregate, bituminous mortar at random;
Step 2, according to the voidage of the asphalt of reality, simulate voidage by particle corresponding in the granular system described in delete step 1, now, asphalt is considered as the three-phase composite material be made up of coarse aggregate, bituminous mortar and space;
Step 3, to the coarse aggregate in asphalt is inner, bituminous mortar is inner, give corresponding contact type between coarse aggregate to bituminous mortar;
Step 4, arranges and becomes PFC by elementary cell particle aggregation
3D" clump " in software is considered as street roller scroll wheel, according to the Action of Gravity Field principles such as actual street roller, and to elementary cell granular system assigning density, street roller scroll wheel realizes the hydrostatic pressure to asphalt under gravity;
Step 5, gives exciting force to " clump ", is coupled by " clump " system exciting force with gravity, analog vibration compaction;
Step 6, controls compacting road scroll wheel to the compacting of asphalt by fish Programming with Pascal Language.
Further, the size of the area of space that step 1 is given is that the compacting size of practice of construction reduces several times, and is not less than 3 times of nominal maximum aggregate size.
Further, in step 2, according to the particle diameter gathered materials, 2.36mm particle will be less than and pitch is considered as bituminous mortar; Coarse aggregate is considered as by being more than or equal to gathering materials of 2.36mm; Space is stochastic distribution in asphalt.
Further, the contact type of the coarse aggregate inside described in step 3 adopts linear elastic model to represent, the contact type of bituminous mortar inside uses burger model and contacts adhesive model and represents, the contact type utilization burger model between coarse aggregate with bituminous mortar with contact adhesive model and represent.。
Further, in step 4, by the interior contact power of fish programming to particle in street roller scroll wheel, displacement, stress and energy are followed the tracks of.
Further, exciting force described in step 5 is the principle of work according to eccentric of vibratory roller, centrifugal force is carried out vertical direction decomposition and obtains, effect of vibration power over time rule is approximately sinusoidal curve, and vibration force being carried out being coupled with the gravity of street roller scroll wheel to obtain the acting force of vibroll to asphalt.
Beneficial effect: a kind of asphalt compaction simulation method based on discrete element provided by the invention, the three-dimensional configuration feature of gathering materials can be reflected well by irregular particulate units, effectively can simulate static pressure and vibrating compacting to the compacting mechanism of asphalt, simple to operate, practical, by asphalt compacting process compacting mechanism visual pattern show, this cannot obtain based on the conventional test methods of the apparent phenomenon.
Accompanying drawing explanation
Fig. 1 is area three-dimensional scale diagrams in space in embodiment;
Fig. 2 is that the grating ball generated in region in embodiment gathers materials schematic diagram;
Fig. 3 is the asphalt schematic diagram generated in region in embodiment;
Fig. 4 is the schematic diagram of embodiment Asphalt Mixture pavement compaction model.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
A kind of asphalt compaction simulation method based on discrete element of the present invention comprises the following steps:
Step 1, uses PFC
3D" wall " order in software generates given area of space, and in this region, fill the granular system be made up of coarse aggregate, bituminous mortar at random;
Step 2, according to the voidage of the asphalt of reality, simulate voidage by particle corresponding in the granular system described in delete step 1, namely voidage is how many, just deletes how many mortar particle; Now, asphalt is considered as the three-phase composite material that is made up of coarse aggregate, bituminous mortar and space;
Step 3, to the coarse aggregate in asphalt is inner, bituminous mortar is inner, give corresponding contact type between coarse aggregate to bituminous mortar;
Step 4, arranges and becomes PFC by elementary cell particle aggregation
3D" clump " in software is considered as street roller scroll wheel, according to the Action of Gravity Field principles such as actual street roller, and to granule unit system assigning density, street roller scroll wheel realizes the hydrostatic pressure to asphalt under gravity;
Step 5, gives exciting force to " clump ", is coupled by " clump " system exciting force with gravity, analog vibration compaction;
Step 6, controls compacting road scroll wheel to the compacting of asphalt by fish Programming with Pascal Language.
The given area of space of step 1 should can not be excessive according to the requirement of simulated object and computer efficiency size; The compacting size being generally practice of construction reduces several times, and is not less than 3 times of nominal maximum aggregate size.
In step 2, according to the size of gathering materials, 2.36mm particle and pitch etc. will be less than and be considered as bituminous mortar; Coarse aggregate is considered as by being more than or equal to gathering materials of 2.36mm; Space is stochastic distribution in asphalt.
In step 3, the contact type of coarse aggregate inside adopts linear elastic model to represent, the contact type of bituminous mortar inside uses burger model and contacts adhesive model and represents, the contact type utilization burger model between coarse aggregate with bituminous mortar with contact adhesive model and represent.
Street roller scroll wheel described in step 4 is made up of " clump " elementary cell particle, because " clump " does not consider interior contact, can improve operation efficiency, and in compacting process, street roller scroll wheel is unlikely to destroy because interior contact power is excessive.
Exciting force described in step 5 is the principle of work according to eccentric of vibratory roller, centrifugal force is carried out vertical direction decomposition and obtains, effect of vibration power over time rule is approximately sinusoidal curve, and vibration force being carried out being coupled with the gravity of street roller scroll wheel to obtain the acting force of vibroll to asphalt.
Embodiment
Implementation step of the present invention is described with reference to the accompanying drawings for the compacting of asphalt SMA13.The grating of asphalt SMA13 is in table 1.
Table 1 asphalt SMA13 grating table
Concrete asphalt modeling process is as follows:
1) area of space is determined
According to table 1, in asphalt, the number percent of coarse aggregate (being more than or equal to 2.36mm) is preponderated, fine aggregate (being less than 2.36mm) though the number percent that gathers materials shared by particle is few, but due to its volume little, amounts of particles is far more than the quantity of coarse aggregate.According to the dispersion theory of asphalt, asphalt is considered as the heterogeneous composite material be made up of coarse aggregate, bituminous mortar (fine aggregate and pitch) and voidage macro-scale.In addition, consider counting yield problem, thus set up the virtual test specimen of asphalt discrete element often according to above-mentioned dispersion theory.
The area of space of asphalt compaction model need consider asphalt type and operational efficiency.Compacted depth for asphalt practice of construction has certain requirement, for the ease of calculate, area of space size can not carry out modeling in strict accordance with the compacting size of practice of construction, generally should reduce several times, and 3 times of nominal maximum aggregate size should not be less than.As shown in Figure 1, the implementation case adopts and is of a size of 150mm × 50mm × 50mm.
2) asphalt comprises the generation of irregular coarse aggregate, mortar and voidage
At PFC
3Din software, ball unit is the elementary cell of particulate matter.The desirable ball particle of simple employing represents that having corner angle, texture, the plane of disruption etc. obviously differs greatly gathering materials of morphological feature.The present invention adopts irregular Polyhedral Particles to simulate to gather materials has good similarity.
The pavement performance impact of voidage on asphalt is great, and the key of pavement compaction Construction control is exactly reduced the voidage of asphalt by compactness.Asphalt of the present invention refers to the asphalt after the walking beam compacting leveling of paver with some strength and stability.Research shows, now asphalt compactness 80%-90% and voidage relatively little.
At PFC
3Din software, in the granular system generated by plavini, voidage and primary stress can not be controlled simultaneously.The intensity of asphalt under compaction state is lower, is difficult to reach objective air void simply by arranging Action of Gravity Field.Although apply certain speed energy realize target voidage by " wall " order, now intergranular contact stress is comparatively large, if exceed particle bond intensity, the escape of particle can occur.Therefore, the present invention adopts method of substitution namely first to fit in described area of space according to the level of table 1 and generates desirable ball particle, and in " fix " order after some circulations, the contact force of granular system is enough little thus reach static balancing.Secondly, the described desirable ball with certain Grading feature is cut (as shown in Figure 2) according to certain rule, the plane of disruption is represented by the plane of cutting, between cutting planes or cutting planes and ball representation of a surface corner angle, friction factor is arranged to particle surface and represents textural characteristics.Again, due to PFC
3Dthe ball of software is rigid ball and ball is inseparable, above-mentionedly be cut into Virtual cropping, the discrete element unit grain of small particle diameter is generated in above-mentioned spatial domain, if by the ball granule interior of the described small particle diameter discrete element unit grain of fish programming realization at Virtual cropping, then belong to coarse aggregate, otherwise belong to bituminous mortar.Finally, random function is set and simulates voidage by the partial particulate deleted in bituminous mortar.Fig. 3 is the asphalt generated in described region.
3) asphalt interior detail sees this structure of contact and parameter
The contact type of coarse aggregate inside adopts linear elastic model to represent, the contact type of bituminous mortar inside uses burger model and contacts adhesive model and represents, the contact type utilization burger model between coarse aggregate with bituminous mortar with contact adhesive model and represent.And choose suitable rill evolution.Because macro and micro parameter does not have direct conversion formula, there is not relation one to one yet, rill evolution determine that the macro-indicators of i.e. discrete element simulation result is identical with the macro-indicators of test by " inverse " time, selected rill evolution is exactly the rill evolution in model.
4) street roller static pressure stress model
In model, the size of street roller scroll wheel should be coordinated mutually with pavement compaction area size, and the invention process case is 30mm.The scroll wheel elementary cell particle of street roller is assembled for " clump " by fish programming, and described " clump " does not consider inner contact number, and the contact force of particle is ignored, and is conducive to improving counting yield.Fig. 4 is asphaltic road-mix surface course compaction model figure.Give enough large density to elementary cell particle and simulate hydrostatic pressure, the implementation case is 270000kg/m
3.Under gravity, the coarse aggregate position, inside of asphalt is moved, and gather materials and mortar generation relative sliding, interior contact number significantly improves.Can to the interior contact power of particle by fish programming, the tracking such as displacement, stress and energy.
5) street roller vibrating compacting model
According to the principle of work of eccentric of vibratory roller, centrifugal force is carried out vertical direction decomposition and obtains, effect of vibration power over time rule is approximately sinusoidal curve, and vibration force being carried out being coupled with the gravity of street roller scroll wheel to obtain the acting force of vibroll to asphalt.Under exciting force and Action of Gravity Field, particle rearranges, asphalt interior contact power increases, the skeleton structure of gathering materials strengthens, can the interior contact power of analysing particulates by fish programming, the variable informations such as displacement, stress and energy, from the compacting mechanism of microscopic parameter further investigation asphalt.
6) compacting controls
The compacting of asphalt is divided into first pressing, multiple pressure and final pressure, and the speed rolled at different packing stage is different.Dissimilar asphalt, construction environment and target compaction degree are different, and the pass rolled is different.Being programmed by fish with compacting time or compactness etc. is the carrying out of norm controlling compacting.
The above is only the preferred embodiment of the present invention; be noted that for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1., based on an asphalt compaction simulation method for discrete element, it is characterized in that: comprise the following steps:
Step 1, uses PFC
3D" wall " order in software generates given area of space, and in this region, fill the granular system be made up of coarse aggregate, bituminous mortar at random;
Step 2, according to the voidage of the asphalt of reality, simulate voidage by particle corresponding in the granular system described in delete step 1, now, asphalt is considered as the three-phase composite material be made up of coarse aggregate, bituminous mortar and space;
Step 3, to the coarse aggregate in asphalt is inner, bituminous mortar is inner, give corresponding contact type between coarse aggregate to bituminous mortar;
Step 4, arranges and becomes PFC by elementary cell particle aggregation
3D" clump " in software is considered as street roller scroll wheel, according to the Action of Gravity Field principles such as actual street roller, and to elementary cell granular system assigning density, street roller scroll wheel realizes the hydrostatic pressure to asphalt under gravity;
Step 5, gives exciting force to " clump ", is coupled by " clump " system exciting force with gravity, analog vibration compaction;
Step 6, controls compacting road scroll wheel to the compacting of asphalt by fish Programming with Pascal Language.
2. as claimed in claim 1 based on the asphalt compaction simulation method of discrete element, it is characterized in that: the size of the area of space that step 1 is given is that the compacting size of practice of construction reduces several times, and is not less than 3 times of nominal maximum aggregate size.
3. as claimed in claim 1 based on the asphalt compaction simulation method of discrete element, it is characterized in that: in step 2, according to the particle diameter gathered materials, 2.36mm particle will be less than and pitch is considered as bituminous mortar; Coarse aggregate is considered as by being more than or equal to gathering materials of 2.36mm; Space is stochastic distribution in asphalt.
4. as claimed in claim 1 based on the asphalt compaction simulation method of discrete element, it is characterized in that: the contact type of the coarse aggregate inside described in step 3 adopts linear elastic model to represent, the contact type of bituminous mortar inside uses burger model and contacts adhesive model and represents, the contact type utilization burger model between coarse aggregate with bituminous mortar with contact adhesive model and represent.
5. as claimed in claim 1 based on the asphalt compaction simulation method of discrete element, it is characterized in that: in step 4, by the interior contact power of fish programming to particle in street roller scroll wheel, displacement, stress and energy are followed the tracks of.
6. as claimed in claim 1 based on the asphalt compaction simulation method of discrete element, it is characterized in that: exciting force described in step 5 is the principle of work according to eccentric of vibratory roller, centrifugal force is carried out vertical direction decomposition and obtains, effect of vibration power over time rule is approximately sinusoidal curve, and vibration force being carried out being coupled with the gravity of street roller scroll wheel to obtain the acting force of vibroll to asphalt.
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| CN110987928B (en) * | 2019-12-02 | 2022-03-15 | 扬州大学 | Recycled aggregate asphalt mixture aggregate contact type analysis method |
| CN110889162A (en) * | 2019-12-12 | 2020-03-17 | 河海大学 | Discrete element-based steel bridge deck pavement interlayer shear fatigue behavior simulation method |
| CN113239433A (en) * | 2021-05-08 | 2021-08-10 | 东南大学 | Steel bridge deck pavement layer rolling construction simulation method |
| CN113239433B (en) * | 2021-05-08 | 2022-11-04 | 东南大学 | Steel bridge deck pavement layer rolling construction simulation method |
| CN115618702A (en) * | 2022-10-21 | 2023-01-17 | 河海大学 | Method for generating two-dimensional ultrahigh volume fraction hybrid rock numerical simulation model by adopting overlapped contact cutting algorithm |
| CN115618702B (en) * | 2022-10-21 | 2023-05-09 | 河海大学 | Method for generating two-dimensional ultrahigh volume fraction mixed rock numerical simulation model by adopting overlapping contact cutting algorithm |
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