CN110728092A - Method for establishing and using temperature coupling model of mixed asphalt pavement structure - Google Patents
Method for establishing and using temperature coupling model of mixed asphalt pavement structure Download PDFInfo
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- 239000010426 asphalt Substances 0.000 title claims abstract description 73
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000010168 coupling process Methods 0.000 title claims abstract description 29
- 230000008878 coupling Effects 0.000 title claims abstract description 28
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 28
- 238000004088 simulation Methods 0.000 claims abstract description 44
- 239000000203 mixture Substances 0.000 claims abstract description 32
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 230000005855 radiation Effects 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 5
- 239000000523 sample Substances 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 9
- 239000003570 air Substances 0.000 description 8
- 238000002474 experimental method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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Abstract
The invention discloses a method for establishing a temperature coupling model of a mixed asphalt pavement structure, which comprises the following steps: establishing a geometric model of 250mm multiplied by 200mm multiplied by 180mm, then carrying out meshing on the established geometric model and defining the mesh density, wherein the meshing adopts tetrahedral unit meshing, specifically comprises the steps of setting simulation boundary parameters and carrying out meshing on a simulation area, the established geometric model is a multi-physical-field simulation model, the lower part of the multi-physical-field simulation model is a free boundary, the periphery of the multi-physical-field simulation model is a thermal insulation boundary, the upper layer of the multi-physical-field simulation model is a mixed boundary, and the established multi-physical-field simulation model is the mixed asphalt pavement structure temperature coupling model. The invention also provides a using method of the model. The invention provides a method for analyzing a temperature field of an asphalt pavement, which is used for exploring the temperature evolution process of an asphalt mixture pavement structure in a natural environment.
Description
Technical Field
The invention belongs to the technical field of pavement temperature model building methods, relates to a building method of a mixed asphalt pavement structure temperature coupling model, and further relates to a using method of the model.
Background
Asphalt mixtures are receiving attention for their excellent properties of shock absorption, adhesion, etc. The asphalt mixture is used as a semi-rigid base material, parameters such as compression resistance, bending tension resistance, splitting strength resistance, modulus and the like of the asphalt mixture are changed along with the change of temperature without exception, and the quality of temperature cracks and high-temperature rutting resistance of the asphalt mixture is directly related to the driving safety and the engineering service life. Therefore, a large number of scholars have conducted extensive research efforts on this phenomenon. However, no practical specific method has been found.
Disclosure of Invention
The invention aims to provide a method for establishing a temperature coupling model of a mixed asphalt pavement structure, provides a method for analyzing a temperature field of an asphalt pavement, and explores the temperature evolution process of the asphalt mixture pavement structure in a natural environment.
The invention adopts the technical scheme that a method for establishing a temperature coupling model of a mixed asphalt pavement structure specifically comprises the following steps: establishing a geometric model of 250mm multiplied by 200mm multiplied by 180mm, then carrying out meshing on the established geometric model and defining the mesh density, wherein the meshing adopts tetrahedral unit meshing, specifically comprises the steps of setting simulation boundary parameters and carrying out meshing on a simulation area, the established geometric model is a multi-physical-field simulation model, the lower part of the multi-physical-field simulation model is a free boundary, the periphery is a thermal insulation boundary, the upper layer is a mixed boundary, and the established multi-physical-field simulation model is the mixed asphalt pavement structure temperature coupling model.
The first aspect of the present invention is also characterized in that,
the set simulation boundary parameters are respectively set for thermal radiation, thermal convection, thermal conduction and random uncertain factor parameters.
The main influencing factors of the simulation parameters are air temperature and solar radiation.
The second technical scheme adopted by the invention is that the use method of the mixed asphalt pavement structure temperature coupling model is implemented according to the following steps:
step 1, establishing a 250mm multiplied by 200mm multiplied by 180mm geometric model in ANSYS software, wherein the lower part of the geometric model is a free boundary, the periphery of the geometric model is a thermal insulation boundary, the upper layer of the geometric model is a mixed boundary, then carrying out grid division on the established geometric model and defining grid density, and simulating boundary parameters of thermal radiation, thermal convection, thermal conduction and random uncertain factors are set as parameters corresponding to local summer air temperature and radiation;
and 5, taking cooling measures on weak parts of the structure in advance according to the evolution law of the internal temperature of the asphalt mixture pavement structure monitored in the step 2 along with the change of time and the evolution law of the asphalt mixture pavement structure simulated in the step 3 along with the change of depth.
The invention has the beneficial effects that:
according to the method, a method combining multi-physical-field simulation and experiments is adopted, the temperature evolution law of the asphalt mixture pavement structure is explored, a temperature model of the asphalt mixture pavement structure is established by adopting a method for proving the correctness of the model by using actual data, the model can be used for early warning analysis, and measures such as sprinkling water and cooling are taken on weak positions of the structure in advance.
Drawings
FIG. 1 is a general flow chart of a method for using a temperature coupling model of a mixed asphalt pavement structure according to the present invention;
FIG. 2 is a schematic diagram of boundary condition setting and grid division results of the method for establishing the temperature coupling model of the mixed asphalt pavement structure;
FIG. 3 is a diagram showing the temperature and radiation changes in summer in a certain area measured in an experiment using the temperature coupling model of the mixed asphalt pavement structure;
FIG. 4 is a graph of the evolution law of the internal temperature measured by the method for using the temperature coupling model of the mixed asphalt pavement structure according to the invention along with the change of time;
FIG. 5 is a comparison graph of the measured model depth temperature change and the actual measured change by using the method for the temperature coupling model of the mixed asphalt pavement structure.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a method for establishing a temperature coupling model of a mixed asphalt pavement structure, which specifically comprises the following steps: establishing a geometric model of 250mm multiplied by 200mm multiplied by 180mm, then carrying out grid division on the established geometric model and defining grid density, wherein the grid division adopts tetrahedral unit grid division, specifically comprises setting simulation boundary parameters and carrying out grid division on a simulation area, the established geometric model is a multi-physical-field simulation model, the lower part of the multi-physical-field simulation model is a free boundary, the periphery of the multi-physical-field simulation model is a thermal insulation boundary, the upper layer of the multi-physical-field simulation model is a mixed boundary, and the established multi-physical-field simulation model is a mixed asphalt pavement structure temperature coupling model; the set simulation boundary parameters are respectively set for thermal radiation, thermal convection, heat conduction and random uncertain factor parameters, and the main influencing factors of the simulation parameters are air temperature and solar radiation.
The invention relates to a use method of a mixed asphalt pavement structure temperature coupling model, wherein the flow of the multi-physical-field simulation model established by the mixed asphalt pavement structure temperature coupling model is shown in figure 1, and the use method is implemented according to the following steps:
step 1, establishing a 250mm multiplied by 200mm multiplied by 180mm geometric model in ANSYS software, wherein the lower part of the geometric model is a free boundary, the periphery of the geometric model is a thermal insulation boundary, the upper layer of the geometric model is a mixed boundary, then carrying out grid division on the established geometric model and defining grid density, and simulating boundary parameters of thermal radiation, thermal convection, thermal conduction and random uncertain factors are set as parameters corresponding to local summer air temperature and radiation;
and 5, taking cooling measures on weak parts of the structure in advance according to the evolution law of the internal temperature of the asphalt mixture pavement structure monitored in the step 2 along with the change of time and the evolution law of the asphalt mixture pavement structure simulated in the step 3 along with the change of depth.
In order to ensure the accuracy of the simulation result, the boundary conditions of the simulation process need to be consistent with the real external service environment of the structure as much as possible, namely the established model is that the bottom of the pavement is a road structure base layer, the base layer material is poured and cured, namely the temperature of the base layer material is balanced with the external environment, and therefore the lower boundary condition of the multi-physics field simulation model is assumed to be a third type boundary condition, namely the bottom boundary of the asphalt pavement is a free boundary.
The invention adopts tetrahedral unit grid division, thus ensuring that the finally generated grid is relatively uniform, not only ensuring the calculation precision, but also fully utilizing the calculation resources.
To verify the effectiveness of the present invention, verification was performed with the following results:
the simulation by the method is compared with the actually measured rule, the adopted simulation method is found to have higher consistency, and the accuracy and the reliability of the method are proved; simulation results show that the surface temperature of the asphalt mixture pavement structure changes most obviously along with time, because the surface structure receives most direct heat radiation, the main influence factor of the temperature change comes from the radiation intensity of the sun, and the temperature change rate is higher, and the phenomenon gradually attenuates along with the increase of the depth of the structural layer; meanwhile, as the heat conductivity of the stones in the asphalt mixture is far higher than that of the asphalt, the heat bridge function of the stones in the mixture is obvious.
In order to ensure the accuracy of the simulation result, the boundary conditions of the simulation process need to be consistent with the real external service environment of the structure as much as possible, the boundary conditions and the grids are divided as shown in fig. 2, wherein the real external service environment of the structure is consistent as much as possible by fitting the real measured data on the boundary according to the measured air temperature and the radiation data on the mixed boundary.
The air temperature and the radiation are main response factors of the asphalt road and the temperature field, the temperature conditions of the asphalt road at each depth are periodically changed like the air temperature, and the air temperature and the radiation change in summer measured in the experiment are shown in fig. 3.
The temperature change of the surface layer of the asphalt mixture pavement structure is most obvious over time, because the surface layer structure receives the most direct heat radiation, the main influence factor of the temperature change is the radiation intensity of the sun, the temperature change rate is higher, and the phenomenon gradually attenuates along with the increase of the depth of the structure layer, as shown in figure 4.
As shown in fig. 5, it is clear from the graph that the temperature of the asphalt pavement structure shows a clear periodic trend along with the change of time, and the temperature of the asphalt pavement structure is 13: approximately 00 f reaches a maximum, then its temperature gradually decreases with decreasing thermal radiation and ambient air temperature, and reaches a minimum of one day around 5 am. The reason for this change law is that the ambient temperature and radiation have a large influence on the road surface temperature distribution, as can be seen from fig. 2, the ambient temperature is from 7: 00 starts to rise gradually and the temperature of the asphalt pavement also changes from 7: 00 begins to rise.
From the analysis of the asphalt embedding depth, the internal temperature of the structure changes along with the change of the measuring depth, the occurrence time of the maximum temperature difference of the two depths of 20mm and 100mm is consistent with the maximum temperature occurrence time of the pavement structure, the method has higher consistency with the simulation method adopted by the method, and the accuracy and the reliability of the method are also proved.
(1) With increasing depth, the temperature of the road surface structure gradually decreases, and the maximum temperature difference thereof occurs at the same time as the maximum temperature difference of the structure.
(2) The temperature change of the asphalt mixture pavement structure has obvious periodicity, and the temperature of the asphalt pavement structure is increased and then reduced along with the increase of time. The highest structural temperatures occur during the daytime 13: around 00, the lowest temperature occurs at night 5: about 00. And the maximum temperature difference of different structural depths and the maximum temperature of the structure appear at the same time.
(3) The ANSYS model established in the method is matched with the actually measured data, and the reliability is high. In the process of operating and using the asphalt pavement in future, in order to avoid larger temperature difference from damaging the asphalt structure, the model can be used for analyzing and early warning, and measures such as sprinkling water and cooling are taken on weak positions of the structure in advance.
The invention couples adverse factors (solar radiation, high-temperature environment and wind speed) which affect the safety of the asphalt pavement, namely the coupling process of thermal radiation, thermal conduction and thermal convection, so as to analyze the temperature field of the asphalt pavement. The established multi-field coupling model is compared and verified by combining field measured data, the temperature evolution process of the asphalt mixture pavement structure in the natural meeting environment is further explored, and the research idea and method of the pavement structure temperature evolution rule are expanded.
Claims (4)
1. A method for establishing a temperature coupling model of a mixed asphalt pavement structure is characterized by comprising the following steps: establishing a geometric model of 250mm multiplied by 200mm multiplied by 180mm, then carrying out meshing on the established geometric model and defining the mesh density, wherein the meshing adopts tetrahedral unit meshing, specifically comprises the steps of setting simulation boundary parameters and carrying out meshing on a simulation area, the established geometric model is a multi-physical-field simulation model, the lower part of the multi-physical-field simulation model is a free boundary, the periphery of the multi-physical-field simulation model is a thermal insulation boundary, the upper layer of the multi-physical-field simulation model is a mixed boundary, and the established multi-physical-field simulation model is the mixed asphalt pavement structure temperature coupling model.
2. The method for establishing the temperature coupling model of the mixed asphalt pavement structure according to claim 1, wherein the set simulation boundary parameters are respectively set for thermal radiation, thermal convection, thermal conduction and random uncertain factor parameters.
3. The method for building the temperature coupling model of the mixed asphalt pavement structure according to claim 2, wherein the main influencing factors of the simulation parameters are air temperature and solar radiation.
4. A use method of a mixed asphalt pavement structure temperature coupling model is characterized in that the mixed asphalt pavement structure temperature coupling model is the multi-physical-field simulation model established in claim 3, and the use method is implemented according to the following steps:
step 1, establishing a 250mm multiplied by 200mm multiplied by 180mm geometric model in ANSYS software, wherein the lower part of the geometric model is a free boundary, the periphery of the geometric model is a thermal insulation boundary, the upper layer of the geometric model is a mixed boundary, then carrying out grid division on the established geometric model and defining grid density, and the simulated boundary parameters of thermal radiation, thermal convection, thermal conduction and random uncertain factors are set as parameters corresponding to local summer air temperature and radiation;
step 2, applying thermal irradiation, thermal convection, heat conduction and random uncertain factors to the established temperature coupling model of the mixed asphalt pavement structure, and then simulating the evolution rule of the internal temperature of the asphalt mixture pavement structure along with the change of time under certain boundary conditions;
step 3, respectively selecting positions 20mm and 100mm away from the surface of the asphalt mixture pavement structure as research observation points, performing data acquisition every half hour, and presetting probes at the two depths in ANSYS software to achieve the purpose of observing the temperature change at the depth in real time
Step 4, comparing the evolution law of the internal temperature of the asphalt mixture pavement structure simulated in the step 2 along with the time change and the evolution law of the asphalt mixture pavement structure simulated in the step 3 along with the depth with an actually measured law, and verifying the effectiveness of the evolution laws;
and 5, taking cooling measures on weak parts of the structure in advance according to the evolution law of the internal temperature of the asphalt mixture pavement structure monitored in the step 2 along with the change of time and the evolution law of the asphalt mixture pavement structure simulated in the step 3 along with the change of depth.
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Cited By (3)
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| CN112685902A (en) * | 2020-12-31 | 2021-04-20 | 珠海金山网络游戏科技有限公司 | Construction method and device of diffusion system |
| CN112883453A (en) * | 2020-12-28 | 2021-06-01 | 南京工程学院 | Method for predicting in-place hot recycling heating temperature field of asphalt pavement |
| CN114675691A (en) * | 2022-04-13 | 2022-06-28 | 中铁三局集团第五工程有限公司 | Construction process temperature control method and device for asphalt mixture and storable medium |
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Cited By (4)
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| CN114675691A (en) * | 2022-04-13 | 2022-06-28 | 中铁三局集团第五工程有限公司 | Construction process temperature control method and device for asphalt mixture and storable medium |
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