CN111914460B - Temperature loss simulation method for synchronous paving process of upper layer and lower layer of double-layer drainage asphalt pavement - Google Patents
Temperature loss simulation method for synchronous paving process of upper layer and lower layer of double-layer drainage asphalt pavement Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 102
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000004088 simulation Methods 0.000 title claims abstract description 10
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 37
- 239000012530 fluid Substances 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 6
- 239000002245 particle Substances 0.000 claims description 27
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- 239000000463 material Substances 0.000 abstract description 6
- 238000010168 coupling process Methods 0.000 abstract description 5
- 238000005096 rolling process Methods 0.000 abstract description 5
- 238000004458 analytical method Methods 0.000 abstract description 4
- 238000001816 cooling Methods 0.000 abstract description 4
- 230000008878 coupling Effects 0.000 abstract description 4
- 238000005859 coupling reaction Methods 0.000 abstract description 4
- 201000010099 disease Diseases 0.000 abstract description 2
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 2
- 238000007796 conventional method Methods 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 108
- 238000010276 construction Methods 0.000 description 22
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002356 single layer Substances 0.000 description 2
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
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- 239000002355 dual-layer Substances 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
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Abstract
The invention relates to a temperature loss simulation method for a synchronous paving process of an upper layer and a lower layer of a double-layer drainage asphalt pavement, and belongs to the technical field of drainage asphalt pavements. In order to solve the problems that the difficulty and the accuracy of monitoring the temperature of the asphalt mixture by adopting a conventional method are high and the temperature of the asphalt mixture at a specific time cannot be continuously predicted when the double-layer drainage asphalt pavement is constructed. Firstly, modeling a double-layer drainage asphalt pavement by using discrete element software, setting upper and lower layer material parameters and a contact model, then, setting a fluid domain and grid division for the model by using finite element software, and finally, carrying out DEM-CFD coupling analysis on a paving temperature loss model of the double-layer drainage asphalt pavement. The analysis method for the paving temperature loss of the double-layer drainage asphalt pavement has very important practical significance for improving the rolling property caused by cooling of asphalt mixture when the double-layer drainage asphalt pavement is paved, preventing part of diseases of the double-layer drainage asphalt pavement and prolonging the service life of the road.
Description
Technical Field
The invention relates to a temperature loss simulation method for a synchronous paving process of an upper layer and a lower layer of a double-layer drainage asphalt pavement, and belongs to the technical field of drainage asphalt pavement construction.
Background
The double-layer porous asphalt pavement is an asphalt pavement structure type from the Netherlands, and a layer of relatively uniform fine-graded porous pavement structure is additionally arranged on the original single-layer coarse-graded porous structure. Compared with the traditional single-layer porous asphalt pavement structure, the double-layer structure system has more outstanding superiority in the aspects of noise reduction, skid resistance, drainage, freezing resistance and durability. The construction of the double-layer drainage asphalt pavement is basically the same as that of a common asphalt pavement, and the main difference is that the construction of the bonding layer between the upper layer and the lower layer is required to meet the requirement of a road structure and ensure that the double-layer drainage asphalt pavement has enough drainage capacity. Foreign scholars consider that the construction of double-layer drainage asphalt pavement must pay attention to the following 2 aspects: (1) Before the upper layer is constructed, the lower layer needs to possibly reduce the traffic of vehicles as much as possible; (2) The thickness of the upper layer is thin, and the upper layer is easy to cool during construction, so that the construction is not facilitated.
The traditional construction mode of the double-layer drainage asphalt pavement is the same as that of a common multi-layer asphalt pavement, and the lower layer is constructed firstly, the adhesive layer oil is sprayed, and then the upper layer is constructed. The construction process is easy to be influenced by climatic environment, when the construction is carried out at low temperature, the binding force of the upper layer and the lower layer asphalt mixture is weakened, particularly, the upper layer is cooled quickly due to the thin thickness, so that the rolling is difficult, loose damage is easy to be caused, and the service life of the double-layer drainage asphalt pavement is shortened. In the netherlands, construction Wen Dugui of the double-layer drainage asphalt pavement is set above 10 ℃, which means that the construction can only be carried out for 5 to 10 months, and the construction is not carried out at night in general.
Therefore, how to reduce the problems of difficult rolling, loose road surface damage, and reduced service life of the road caused by too fast cooling speed of asphalt mixture due to environmental influence has become one of the important points of analysis. In recent years, various methods have been tried to solve the problem of too fast cooling of the mixture at different levels, and the learner has proposed to adopt a "hot+hot" paving method, so as to reduce the temperature loss of the mixture at the lower layer to some extent. The quality of the double-layer drainage asphalt pavement is also easily influenced by the transportation capacity of asphalt mixtures, so that the temperature of upper-layer mixtures can be ensured during construction, and foreign students recommend the following construction environments: (1) When the air temperature is lower than 10 ℃, the double-layer pavement, especially the upper layer, is not suitable for construction; (2) When the air temperature is 10-15 ℃, the wind speed is not more than 4m/s; (3) When the air temperature is higher than 15 ℃, the wind speed is not more than 8m/s. It can be seen that the construction of the double-layer drainage asphalt pavement has high environmental requirements. In order to solve the problem that the upper material is easy to cool during low-temperature construction, the best solution is that two layers of materials are sequentially paved, the upper material is paved immediately after the lower layer is paved, the upper material is heated by the lower layer, and the cooling speed is reduced.
When the double-layer drainage asphalt pavement is constructed, the weight of a disc of full material stirred by the intermittent asphalt mixture stirring station is about 3000kg, and the temperature loss of the asphalt mixture can be caused by repeated intermittent mixing and paving. At present, a thermometer is often used for judging the temperature of an asphalt mixture, and the asphalt mixture has the characteristics of intuitiveness and convenience, but is time-consuming and labor-consuming, is also easy to be subjectively influenced by detection personnel, and the thermometer is used for solving the problem of temperature response lag, so that the result accuracy is insufficient and the reliability is lower. At present, an infrared thermal imager is also commonly adopted to detect temperature uniformity in the paving and rolling processes of the lower layer of the double-layer drainage asphalt pavement, but belongs to non-contact equipment, is greatly influenced by environmental temperature, humidity and wind speed, and has the problem of lower accuracy. In addition, the conventional temperature monitoring method adopted at present cannot continuously predict the temperature of the asphalt mixture at a specific time.
Therefore, according to the phenomenon of temperature loss during paving of the double-layer drainage asphalt pavement, a discrete element-computational fluid dynamics coupling method (DEM-CFD) is adopted for analysis. Firstly, a double-layer drainage asphalt pavement model is built by using discrete element software, a heat conduction contact model, specific heat capacity, heat conductivity and environmental temperature are arranged among aggregate particles, then the model is led into computational fluid dynamics software to carry out fluid domain setting and grid division, and finally, the whole process simulation is carried out on the temperature loss of the upper layer and the lower layer of the double-layer drainage asphalt pavement during paving, so that constructors can know the temperature loss condition of a real-time porous asphalt mixture in time, the later-stage temperature loss can be predicted, the pavement construction quality is improved, and the service life of a road is prolonged.
Disclosure of Invention
(1) Technical problem
The invention discloses a temperature loss simulation method for an upper layer and a lower layer synchronous paving process of a double-layer drainage asphalt pavement, which solves the problems that the temperature of an asphalt mixture is difficult to monitor by adopting a conventional temperature measurement method in the upper layer and the lower layer synchronous paving process of the double-layer drainage asphalt pavement, the monitoring difficulty is high, the accuracy is poor, the whole paving process of the upper layer and the lower layer of the double-layer drainage asphalt pavement and the temperature of the asphalt mixture at a specific moment cannot be predicted, and the like, and improves the construction quality of the double-layer drainage asphalt pavement.
(2) Technical proposal
The method aims to solve the problems that the upper-layer asphalt mixture and the lower-layer asphalt mixture have high environmental requirements, the temperature loss of the mixture is relatively fast, the monitoring difficulty is high, and the temperature of the asphalt mixture is continuously predicted in a specific time when the existing double-layer drainage asphalt pavement is paved in a layered manner. Firstly, modeling a double-layer drainage asphalt pavement by using discrete element software, setting aggregate particle temperature, thermal conductivity, specific heat capacity and thermal conduction contact model, and then coupling with computational fluid dynamics software to simulate the temperature transmission and loss conditions of upper and lower mixture of the double-layer drainage asphalt pavement under natural conditions. The technical scheme of the invention is as follows: firstly, a CAD software is used for establishing a double-layer drainage asphalt pavement integral frame, as shown in figure 1, after the frame is led into discrete element software, aggregate particles with different thickness and void ratio are respectively generated on an upper layer frame and a lower layer frame, bond keys are added, a double-layer drainage asphalt pavement model is established, then a heat conduction model, heat conductivity, temperature and specific heat capacity between the two aggregate particles are set through contact conditions, then the model is led into finite element software, a fluid domain is set, grids are divided, after coupling calculation, temperature changes of the upper layer and the lower layer of the double-layer drainage asphalt pavement during paving can be checked in real time, corresponding management measures are adopted after a proper temperature loss range is determined according to the temperature during paving control, pavement rolling property can be improved, partial diseases of the double-layer drainage asphalt pavement are prevented, and the service life of a road is prolonged.
(3) Advantageous effects
The quality of the double-layer drainage asphalt pavement is influenced by the transportation capacity of the mixture, and the upper layer mixture is ensured to have enough temperature during construction. Construction at low temperature, the bonding effect of the upper layer and the lower layer of the double-layer drainage asphalt pavement is poor, particularly, the upper layer is cooled quickly due to the thin thickness, so that the double-layer drainage asphalt pavement is difficult to roll and easy to cause loose damage, and the service life of the double-layer drainage asphalt pavement is shortened. The invention provides a temperature loss simulation method for a synchronous paving process of an upper layer and a lower layer of a double-layer drainage asphalt pavement. Firstly, a discrete element method is used for establishing a double-layer drainage asphalt pavement model, a heat conduction contact model, specific heat capacity, heat conductivity and environmental temperature are arranged among aggregate particles, then the model is led into computational fluid dynamics software to carry out fluid domain setting and grid division, finally, the whole process simulation is carried out on the temperature loss of the upper layer and the lower layer of the double-layer drainage asphalt pavement in a DEM-CFD coupling mode, so that constructors can know the temperature loss of a real-time mixture in time and predict the later temperature loss, the investment of manpower and equipment is saved, and the method has very important practical significance for improving the pavement construction quality and prolonging the service life of roads.
Drawings
FIG. 1 is a schematic diagram of an overall frame of a dual layer drainage asphalt pavement structure
1-Cross slope, 2-double-layer drainage asphalt pavement upper layer frame and 3-double-layer drainage asphalt pavement lower layer frame
Detailed Description
The invention provides a temperature loss simulation method for a synchronous paving process of an upper layer and a lower layer of a double-layer drainage asphalt pavement, which comprises the following specific implementation steps:
(1) The grading of the lower-layer asphalt mixture and the upper-layer asphalt mixture of the double-layer drainage asphalt pavement respectively adopts porous asphalt mixtures PA-20 and PA-13, an aggregate composition model of the two grading is established based on a discrete element method, the PA-20 only considers aggregate particles with the particle diameters of 20mm, 16mm, 13.2mm, 9.5mm and 4.75mm, the PA-13 grading only considers aggregate particles with the particle diameters of 13.2mm, 9.5mm and 4.75mm, the Young modulus, the recovery coefficient and the bonding radius of the two grading aggregates of the PA-20 and the PA-13 are set, and the particle quality and the density are automatically calculated by using discrete element software;
(2) Establishing a geometric body with the length, width and height of 600mm, 400mm and 100mm respectively and the transverse gradient of 2% from the center to the two sides of the top surface as a double-layer drainage asphalt pavement integral frame by using CAD software, wherein the length, width and height of an upper layer frame of the double-layer drainage asphalt pavement are 600mm, 400mm and 60mm respectively, and the length, width and height of a lower layer frame are 600mm, 400mm and 40mm respectively, introducing the model integral frame into discrete element software, and filling PA-20 graded aggregate particles into the lower layer frame of the double-layer drainage asphalt pavement and PA-13 graded aggregate particles into the upper layer frame in the discrete element software;
(3) A Heat connection contact model is adopted among the particles, actual paving temperatures of two graded particles of PA-13 and PA-20 are respectively set, a Temperature Updats model is added in the particle volume force contact model, specific Heat capacity and thermal conductivity are set, and a double-layer drainage asphalt pavement paving temperature loss model is established;
(4) Converting a file format of a double-layer drainage asphalt pavement model derived by discrete meta-software into a stl file format by using a Python program, importing the stl file format into finite-element software, setting a fluid domain, and then dividing a grid to generate a msh file;
(5) After the msh file is imported into finite element software, setting a heat exchange model and an energy equation, respectively setting the air speed at the inlet of a fluid domain of the double-layer drainage asphalt pavement to be 2m/s, 4m/s, 6m/s and 8m/s, respectively setting the environmental temperature to be 10 ℃,11 ℃,12 ℃,13 ℃,14 ℃ and 15 ℃, and establishing a paving temperature loss model of the double-layer drainage asphalt pavement;
(6) And (3) operating a paving temperature loss model of the double-layer drainage asphalt pavement to obtain upper and lower temperature distribution cloud patterns and fluid phase distribution cloud patterns of the double-layer drainage asphalt pavement under different working conditions, analyzing aggregate temperatures of different layers and different particle diameters, monitoring the temperature loss of the asphalt mixture in the paving process, predicting the temperature of the asphalt mixture at a specific moment, and improving the compacting effect of the double-layer drainage asphalt pavement.
Claims (1)
1. A temperature loss simulation method for synchronous paving of upper and lower layers of a double-layer drainage asphalt pavement is characterized by comprising the following specific steps:
(1) The grading of the lower-layer asphalt mixture and the upper-layer asphalt mixture of the double-layer drainage asphalt pavement respectively adopts porous asphalt mixtures PA-20 and PA-13, an aggregate composition model of the two grading is established based on a discrete element method, the PA-20 only considers aggregate particles with the particle diameters of 20mm, 16mm, 13.2mm, 9.5mm and 4.75mm, the PA-13 grading only considers aggregate particles with the particle diameters of 13.2mm, 9.5mm and 4.75mm, the Young modulus, the recovery coefficient and the bonding radius of the two grading aggregates of the PA-20 and the PA-13 are set, and the particle quality and the density are automatically calculated by using discrete element software;
(2) Establishing a geometric body with the length, width and height of 600mm, 400mm and 100mm respectively and the transverse gradient of 2% from the center to the two sides of the top surface as a double-layer drainage asphalt pavement integral frame by using CAD software, wherein the length, width and height of an upper layer frame of the double-layer drainage asphalt pavement are 600mm, 400mm and 60mm respectively, and the length, width and height of a lower layer frame are 600mm, 400mm and 40mm respectively, introducing the model integral frame into discrete element software, and filling PA-20 graded aggregate particles into the lower layer frame of the double-layer drainage asphalt pavement and PA-13 graded aggregate particles into the upper layer frame in the discrete element software;
(3) A Heat connection contact model is adopted among the particles, actual paving temperatures of two graded particles of PA-13 and PA-20 are respectively set, a Temperature Updats model is added in the particle volume force contact model, specific Heat capacity and thermal conductivity are set, and a double-layer drainage asphalt pavement paving temperature loss model is established;
(4) Converting a file format of a double-layer drainage asphalt pavement model derived by discrete meta-software into a stl file format by using a Python program, importing the stl file format into finite-element software, setting a fluid domain, and then dividing a grid to generate a msh file;
(5) After the msh file is imported into finite element software, setting a heat exchange model and an energy equation, respectively setting the air speed at the inlet of a fluid domain of the double-layer drainage asphalt pavement to be 2m/s, 4m/s, 6m/s and 8m/s, respectively setting the environmental temperature to be 10 ℃,11 ℃,12 ℃,13 ℃,14 ℃ and 15 ℃, and establishing a paving temperature loss model of the double-layer drainage asphalt pavement;
(6) And (3) operating a paving temperature loss model of the double-layer drainage asphalt pavement to obtain upper and lower temperature distribution cloud patterns and fluid phase distribution cloud patterns of the double-layer drainage asphalt pavement under different working conditions, analyzing aggregate temperatures of different layers and different particle diameters, monitoring the temperature loss of the asphalt mixture in the paving process, predicting the temperature of the asphalt mixture at a specific moment, and improving the compacting effect of the double-layer drainage asphalt pavement.
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| CN103031801A (en) * | 2013-01-07 | 2013-04-10 | 天津市市政工程设计研究院 | Method for establishing composite pavement temperature field model of underground road |
| CN104790286A (en) * | 2015-04-29 | 2015-07-22 | 南京林业大学 | Method for evaluating hot in-place recycling heating effect of asphalt pavement |
| CN108982257A (en) * | 2018-07-27 | 2018-12-11 | 浙江大学 | A kind of anti-shearing tired Double-layer asphalt mixture gradation optimization method based on virtual repetition penetration test |
| CN110331632A (en) * | 2019-06-27 | 2019-10-15 | 东南大学 | A kind of method that limestone is used for double-layer drainage sub-surface structure |
| CN110442993A (en) * | 2019-08-12 | 2019-11-12 | 南京林业大学 | Analysis method of the interlayer thermal resistance to asphalt pavement structure stressing influence |
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| US20120123969A1 (en) * | 2010-11-15 | 2012-05-17 | Messmer Peter F | Methods and Processes of Road Use Evaluation and Regulation |
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| CN103031801A (en) * | 2013-01-07 | 2013-04-10 | 天津市市政工程设计研究院 | Method for establishing composite pavement temperature field model of underground road |
| CN104790286A (en) * | 2015-04-29 | 2015-07-22 | 南京林业大学 | Method for evaluating hot in-place recycling heating effect of asphalt pavement |
| CN108982257A (en) * | 2018-07-27 | 2018-12-11 | 浙江大学 | A kind of anti-shearing tired Double-layer asphalt mixture gradation optimization method based on virtual repetition penetration test |
| CN110331632A (en) * | 2019-06-27 | 2019-10-15 | 东南大学 | A kind of method that limestone is used for double-layer drainage sub-surface structure |
| CN110442993A (en) * | 2019-08-12 | 2019-11-12 | 南京林业大学 | Analysis method of the interlayer thermal resistance to asphalt pavement structure stressing influence |
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