CN111678829A - Temperature control method of linear road accelerated loading test device based on operation energy consumption - Google Patents
Temperature control method of linear road accelerated loading test device based on operation energy consumption Download PDFInfo
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Abstract
The invention discloses a temperature control method of a linear road accelerated loading test device based on operation energy consumption, which comprises the following steps: preliminarily determining a plurality of temperature control datum points of a test road; analyzing the preliminarily determined temperature fluctuation conditions of different structural layers of the test road under each temperature control reference point to determine the temperature control reference points of each structural layer of the test road; determining the temperature control mode of each structural layer of the test road; determining the energy consumption required by each structural layer of the test road to reach the preset temperature under different temperature control parameter combinations; and analyzing the reliability of the steel structure of the linear road accelerated loading test device in a temperature control stage, and formulating a corresponding temperature control system on the basis of minimum energy consumption. The invention is suitable for the temperature control of the road in the accelerated loading test preparation stage and the road accelerated loading test device, greatly improves the temperature control accuracy, reduces the energy consumption, and has important value and practical significance.
Description
Technical Field
The invention relates to the technical field of traffic engineering, in particular to a temperature control method of a linear road accelerated loading test device based on operation energy consumption.
Background
The pavement performance of asphalt and asphalt mixture is greatly influenced by temperature, the temperature influences the mechanical property of asphalt roads, and the combined action of the temperature and load can cause road diseases. In high temperature seasons in summer, the asphalt pavement mainly generates track diseases, and in low temperature seasons in winter, temperature shrinkage cracks are generated due to sudden temperature drop and repeated temperature reduction. The long-term effect can cause fatigue failure of the asphalt road.
The linear road accelerated loading test device is used for simulating half shaft tests of accelerated loading of roads with different load types, different materials and different structures in special region environments. The test is used for simulating real conditions, a long-term rule can be obtained through a short-term test, and the test is applied to comparison of different road surface types, different load types and different road materials, or verification of road surface response and material condition models. Therefore, the technology of road design, construction, use, maintenance and the like is improved, and a basis is provided for formulating relevant technical specifications.
The linear road accelerated loading test device can simulate the influence of environmental factors such as temperature, rainfall, ultraviolet illumination and underground water on the road surface in a loading space, and can move horizontally between two linear test lanes through the rail, so that alternate loading tests are met. The device has good application prospect, and has extremely important significance in researching dynamic action reaction of pavement materials in an accelerated temperature field environment, estimating and evaluating residual service life after service and verifying pavement structure performance.
However, at present, the set of linear acceleration loading test device has not a complete test system, and the test acceleration can not be systematically realized according to the action mechanism of the temperature field, so that the establishment of the test system of the temperature control system of the linear road acceleration loading device has a very important significance for the road acceleration test and the research on the service performance of the pavement, and in addition, the linear acceleration loading test device can generate a large amount of energy consumption during the operation, and the energy consumption is reduced by designing a corresponding temperature control method, so that the linear acceleration loading test device also has an important environmental protection value and significance.
Disclosure of Invention
The invention provides a temperature control method of a linear road accelerated loading test device based on operation energy consumption, which aims to solve the technical problem that the conventional linear accelerated loading test device has no complete test system and cannot systematically realize test acceleration according to a temperature field action mechanism. Therefore, in the accelerated loading test preparation stage, the road accelerated loading test device and the corresponding test road structure reach the preset temperature field scientifically and normatively, and then the multi-field coupling accelerated loading test of the test road is accurately carried out.
In order to solve the technical problems, the invention provides the following technical scheme:
a temperature control method of a linear road accelerated loading test device based on operation energy consumption is provided, the linear road accelerated loading test device comprises a temperature control system, and the method comprises the following steps:
analyzing the influence rule of the temperature control system on the temperature field of the test road and the air temperature field in the linear road accelerated loading test device, and preliminarily determining a plurality of temperature control reference points of the test road based on the analysis result;
analyzing the preliminarily determined temperature fluctuation conditions of different structural layers of the test road under each temperature control reference point through a temperature rise simulation test, and determining the temperature control reference points of each structural layer of the test road based on the analysis result;
analyzing the influence of different temperature control modes of the temperature control system on each structural layer of the test road through a temperature rise simulation test, and determining the temperature control mode of each structural layer of the test road based on the analysis result;
determining the energy consumption required by each structural layer of the test road to reach the preset temperature under different temperature control parameter combinations;
analyzing the reliability of the steel structure of the linear road accelerated loading test device in a temperature control stage;
and based on the reliability analysis result of the steel structure in the temperature control stage, controlling the temperature of each structural layer of the test road by using the minimum energy consumption as a principle under the condition that the steel structure meets the preset reliability requirement.
Further, the analysis the law of influence of temperature control system to experimental road temperature field and the inside air temperature field of linear road accelerated loading test device includes:
establishing a finite element model of the linear road accelerated loading test device;
and analyzing the influence rule of the temperature control system on the temperature field of the test road and the air temperature field in the accelerated loading test device of the linear road based on the finite element model.
Further, the preliminary determination of a plurality of temperature control reference points of the test road based on the analysis result comprises:
analyzing the influence of different temperature control parameters on the distribution uniformity of the air temperature field according to the influence rule of the temperature control system on the air temperature field in the linear road accelerated loading test device;
determining an effective temperature interval of the test road according to the influence rule of the temperature control system on the temperature field of the test road and the influence of different temperature control parameters on the distribution uniformity of the air temperature field;
and preliminarily determining a plurality of temperature control reference points of the test road based on the effective temperature interval.
Further, the structural layer of the test road comprises a surface layer, a base layer and a soil base layer;
the temperature control reference point for determining each structural layer of the test road comprises the following steps: and determining the temperature control reference point of the surface layer of the test road, the temperature control reference point of the base layer and the temperature control reference point of the soil base layer.
Further, the temperature control mode comprises overground temperature control, underground temperature control and combination of the overground temperature control and the underground temperature control.
Further, the influence of different temperature control modes of the temperature control system on each structural layer of the test road is analyzed through a temperature rise simulation test, and the temperature control modes of each structural layer of the test road are determined based on the analysis result, which comprises the following steps:
the influence of three temperature control modes, namely, ground temperature control, underground temperature control and combination of the ground temperature control and the underground temperature control, on each structural layer of the test road is analyzed through a temperature rise simulation test, and the temperature control mode of each structural layer of the test road is determined according to the temperature rise economy and the overall temperature distribution of each structural layer of the test road.
Further, the temperature control parameters comprise the air outlet speed and the hot air temperature of the temperature control system.
Further, the reliability of the steel structure of the analysis linear road accelerated loading test device in the temperature control stage comprises:
analyzing the influence of the temperature control system on the steel structure temperature field of the linear road accelerated loading test device, and establishing a fluid-solid coupling finite element model based on the analysis result;
solving the temperature stress distribution of the steel structure based on the fluid-solid coupling finite element model;
and analyzing the reliability of the steel structure in the temperature control stage based on the temperature stress distribution.
The technical scheme provided by the invention has the beneficial effects that at least:
the temperature control method of the linear road accelerated loading test device conforms to the actual mechanism principle of a temperature field and a road action, and the safe and reliable performance of the test is ensured by calculating the temperature stress of the steel structure of the device in the temperature rising/reducing stage for reaching the preset temperature; the whole temperature control process is ensured to be carried out scientifically and accurately by selecting temperature control reference points of each layer of the road; the energy consumption of different temperature control schemes is calculated, so that the aim of reducing the energy consumption is fulfilled. The temperature control method is scientific and efficient, and meanwhile, the prediction accuracy of the current accelerated loading test is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic flow chart of a temperature control method of a linear road accelerated loading test device based on operation energy consumption according to an embodiment of the present invention;
FIG. 2 is another schematic flow chart of a temperature control method for a linear road accelerated loading test device based on operating energy consumption according to an embodiment of the present invention;
FIG. 3 is a schematic view of a road surface temperature control system of the linear road acceleration loading unit;
fig. 4 is a schematic diagram of a temperature control system inside a roadbed.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First embodiment
Referring to fig. 1 to 4, the embodiment provides a temperature control method for a linear road accelerated loading test device based on operation energy consumption; the linear road accelerated loading test device comprises a temperature control system, wherein the temperature control system comprises a road surface temperature control system and a roadbed internal temperature control system, as shown in fig. 3 and 4; the pavement temperature control system comprises an air supply outlet 1, an air supply pipeline 2, a circulating fan set 3, a heater 4, an air return pipeline 5, a cascade unit 6, an air return inlet 7, a water tank 8 and a humidifier 9; the temperature control system in the roadbed comprises a buried pipe 10 arranged in the road and an underground temperature control device 11 connected with the buried pipe 10.
Based on the above, the flow of the method of this embodiment is shown in fig. 1 and fig. 2, and mainly includes the following steps:
s101, analyzing the influence rule of a temperature control system on a temperature field of a test road and an air temperature field in a linear road accelerated loading test device, and preliminarily determining a plurality of temperature control reference points of the test road based on the analysis result;
specifically, in this embodiment, the foregoing S101 specifically is: analyzing the influence rules of different temperature control systems on the road structure temperature field and the combination of different temperature control parameters, and preliminarily determining a plurality of temperature control reference points according to different road structures for the influences of the air flow field distribution, the air temperature field distribution, the steel structure temperature field distribution and the road structure temperature field distribution; the implementation process is specifically shown in fig. 2, and includes the following steps:
establishing a finite element model of the linear road accelerated loading test device;
analyzing the influence rule of the temperature control system on the temperature field of the test road and the air temperature field in the accelerated loading test device of the linear road based on a finite element model;
analyzing the influence of different temperature control parameters on the distribution uniformity of the air temperature field according to the influence rule of the temperature control system on the air temperature field in the linear road acceleration loading test device;
determining an effective temperature interval of the test road according to the influence rule of the temperature control system on the temperature field of the test road and the influence of different temperature control parameters on the distribution uniformity of the air temperature field;
and preliminarily determining a plurality of temperature control reference points of the test road based on the effective temperature interval.
S102, analyzing the preliminarily determined temperature fluctuation conditions of different structural layers of the test road under each temperature control reference point, and determining the temperature control reference points of each structural layer of the test road based on the analysis result;
specifically, in the present embodiment, the road structure includes a surface layer, a base layer, and a soil base layer; the step S102 is specifically: the temperature control rules of different road layers of the road structure surface layer, the base layer and the soil base layer are analyzed, the temperature control reference point of each layer is determined, the temperature of the corresponding road structure layer is controlled through the point, and the acceleration test is carried out according to the point.
S103, analyzing the influence of different temperature control modes of the temperature control system on each structural layer of the test road through a temperature rise simulation test, and determining the temperature control mode of each structural layer of the test road based on the analysis result;
specifically, in this embodiment, the temperature control modes include three temperature control modes, namely, above-ground temperature control, underground temperature control, and combination of above-ground temperature control and underground temperature control. The influence of three temperature control modes of ground temperature control, underground temperature control and combination of ground temperature control and underground temperature control on each structural layer of the road is analyzed through a heating simulation test, and the temperature control mode of each structural layer of the road is determined according to heating economy and the overall temperature distribution of each structural layer of the road.
S104, determining energy consumption required by each structural layer of the road to reach a preset temperature under different temperature control parameter combinations;
specifically, in this embodiment, the temperature control parameters include an air outlet speed and a hot air temperature of the temperature control system. In the embodiment, different road structures are used for achieving the preset temperature, energy consumption required by each structural layer to achieve the preset temperature is analyzed, and temperature control parameters of the temperature control system are optimally combined.
S105, analyzing the reliability of the steel structure of the linear road accelerated loading test device in a temperature control stage;
specifically, in this embodiment, as shown in fig. 2, the step S105 specifically includes:
analyzing the influence of a temperature control system on a steel structure temperature field of a linear road acceleration loading test device, and establishing a fluid-solid coupling finite element model based on an analysis result;
solving the temperature stress distribution of the steel structure based on the fluid-solid coupling finite element model;
and analyzing the reliability of the steel structure in the temperature control stage based on the temperature stress distribution of the steel structure.
And S106, controlling the temperature of each structural layer of the test road by using the principle of minimum energy consumption under the condition that the steel structure meets the preset reliability requirement based on the reliability analysis result of the steel structure in the temperature control stage.
Specifically, in this embodiment, the step S106 is specifically: the temperature control method of the linear accelerated loading test device is formulated by summarizing the temperature control rule of the linear accelerated loading test device and combining the reliability of the steel structure of the linear accelerated loading test device and the energy consumption comparison of different temperature control parameter combinations.
In summary, the temperature control method of the linear road accelerated loading test device based on the operation energy consumption of the embodiment selects the temperature control reference point and the temperature control mode according to different road structures, and controls the temperature rise/fall process and the temperature of the corresponding road structure layer according to the point; calculating the energy consumption of the device under different temperature control system parameters when the preset temperature is reached; and establishing a corresponding preset temperature implementation system by using the minimum energy consumption as a principle. The temperature field and the road action actual mechanism are met; the method is suitable for controlling the temperature of the road in the accelerated loading test preparation stage and the road accelerated loading test device, greatly improves the temperature control accuracy, reduces the energy consumption, and has important value and practical significance.
Second embodiment
In this embodiment, a certain test road section is selected, and a practical application example is combined to further describe the temperature control method of the linear road accelerated loading test device based on operation energy consumption, which includes the following steps:
firstly, selecting a temperature control datum point according to the selected asphalt road structure.
It should be noted that the selection principle of the temperature control reference point is as follows: taking a typical structure of an asphalt road of an expressway as an example, taking the depth of 5cm, 11cm, 18cm (surface layer), 28cm, 38cm, 48cm, 58cm, 68cm, 78cm (base layer), 100cm, 150cm and 200cm (soil base layer) of the road structure as a primary temperature control datum point; wherein, the positions of 5cm, 11cm and 18cm are the bottoms of the three-layer surface layer structure; dividing the base layer at positions of 28cm, 38cm, 48cm, 58cm, 68cm and 78cm according to one point per 10 cm; the soil base layer is divided into one point per 50cm at the positions of 100cm, 150cm and 200 cm.
And step two, determining each layer of temperature control reference point through simulation analysis.
The temperature fluctuation conditions under each temperature control reference point are analyzed through a temperature rise simulation test, and each layer of temperature control reference point is determined by combining the convenience of temperature control. Taking a typical structure of an asphalt road of an expressway as an example, simulation analysis is carried out to determine that the surface layer temperature control datum point is at a depth of 11cm, the base layer temperature control datum point is at a depth of 38cm, and the soil base layer temperature control datum point is at a depth of 150 cm.
And step three, according to different road structures, carrying out simulation analysis on the road temperature control modes, and determining the temperature control modes of all layers of the road structures.
Taking a typical structure of an asphalt road of a highway as an example, simulation analysis shows that an overground temperature control mode is suggested for the whole temperature control period of a surface layer and a base layer; for the whole temperature control period of the soil base layer, if the temperature control temperature is less than 35 ℃, the underground temperature control mode is recommended to be adopted for temperature control; if the temperature control temperature is higher than 35 ℃, the temperature control is recommended to be carried out simultaneously by adopting a mode of combining underground temperature control with overground temperature control.
And step four, analyzing the energy consumption of each structural layer under different temperature control parameter combinations when the structural layer reaches the preset temperature, and selecting the temperature control scheme with the minimum energy consumption.
Taking the surface layer reaching 30 ℃ as an example, the surface layer temperature control datum point is selected at the depth of 11cm as known from the step two, the ground temperature control mode is selected for temperature control in the step three, then different temperature control parameter combinations are carried out according to the parameter range of the device temperature control system, energy consumption under different combinations is calculated, and the result is shown in tables 1 and 2, and the parameter set with the minimum required energy consumption is that the wind speed is 9m/s, the hot wind temperature is 31 ℃ and the energy consumption is 332.2 KJ.
TABLE 1 technical parameter table of ground temp. control system
| Technical index | Value range |
| Temperature of the air supply | [-50，60]℃ |
| Wind speed | ≤10m/s |
TABLE 2 analysis of energy consumption of different temperature control combinations of surface layers
| Wind speed (m/s) | Temperature of Hot air (. degree. C.) | Temperature of surface layer (. degree. C.) | Energy consumption (KJ) |
| 8 | 45 | 30.2 | 656.97 |
| 9 | 31 | 30.1 | 332.2 |
| 7 | 53 | 30.5 | 1494.95 |
And fifthly, calculating the temperature stress of the steel structure of the linear road acceleration loading device at the temperature rising/reducing stage when the preset temperature is reached, and ensuring that the device is safely and reliably operated in the temperature control process.
And step six, establishing a temperature control method of the linear accelerated loading test device by combining the steel structure reliability analysis and the energy consumption under different temperature control system parameter combinations.
In summary, in the method of the embodiment, simulation analysis is performed on the road temperature control modes according to different road structures, so as to determine the temperature control modes of each layer of the road structure; analyzing the energy consumption of each structural layer under different temperature control parameter combinations when the structural layer reaches a preset temperature, and selecting a temperature control scheme with the minimum energy consumption; calculating the temperature stress of a steel structure of the linear road acceleration loading device at the temperature rising/reducing stage when the temperature reaches the preset temperature, so as to ensure the safe and reliable operation of the device in the temperature control process; and (3) establishing a temperature control method of the linear accelerated loading test device by combining the steel structure reliability analysis and the energy consumption under different temperature control system parameter combinations. The temperature control accuracy is improved, the energy consumption is reduced, and the road accelerated loading device and the road structure reach the preset temperature of an accelerated loading test scientifically and normatively.
Further, it should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or terminal apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or terminal apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or terminal that comprises the element.
It should be noted that the above describes only a preferred embodiment of the invention and that, although a preferred embodiment of the invention has been described, it will be apparent to those skilled in the art that, once having the benefit of the teachings of the present invention, numerous modifications and adaptations can be made without departing from the principles of the invention and are intended to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Claims (8)
1. A temperature control method of a linear road accelerated loading test device based on operation energy consumption is provided, the linear road accelerated loading test device comprises a temperature control system, and the method is characterized by comprising the following steps:
analyzing the influence rule of the temperature control system on the temperature field of the test road and the air temperature field in the linear road accelerated loading test device, and preliminarily determining a plurality of temperature control reference points of the test road based on the analysis result;
analyzing the preliminarily determined temperature fluctuation conditions of different structural layers of the test road under each temperature control reference point through a temperature rise simulation test, and determining the temperature control reference points of each structural layer of the test road based on the analysis result;
analyzing the influence of different temperature control modes of the temperature control system on each structural layer of the test road through a temperature rise simulation test, and determining the temperature control mode of each structural layer of the test road based on the analysis result;
determining the energy consumption required by each structural layer of the test road to reach the preset temperature under different temperature control parameter combinations;
analyzing the reliability of the steel structure of the linear road accelerated loading test device in a temperature control stage;
and based on the reliability analysis result of the steel structure in the temperature control stage, controlling the temperature of each structural layer of the test road by using the minimum energy consumption as a principle under the condition that the steel structure meets the preset reliability requirement.
2. The method for controlling the temperature of the linear road accelerated loading test device based on the operation energy consumption of claim 1, wherein the analyzing the rule of the temperature control system on the test road temperature field and the air temperature field inside the linear road accelerated loading test device comprises:
establishing a finite element model of the linear road accelerated loading test device;
and analyzing the influence rule of the temperature control system on the temperature field of the test road and the air temperature field in the accelerated loading test device of the linear road based on the finite element model.
3. The method for controlling the temperature of the linear road accelerated loading test device based on the operation energy consumption as claimed in claim 2, wherein the preliminary determination of a plurality of temperature control reference points of the test road based on the analysis result comprises:
analyzing the influence of different temperature control parameters on the distribution uniformity of the air temperature field according to the influence rule of the temperature control system on the air temperature field in the linear road accelerated loading test device;
determining an effective temperature interval of the test road according to the influence rule of the temperature control system on the temperature field of the test road and the influence of different temperature control parameters on the distribution uniformity of the air temperature field;
and preliminarily determining a plurality of temperature control reference points of the test road based on the effective temperature interval.
4. The temperature control method of the linear road accelerated loading test device based on the operation energy consumption as claimed in claim 1, wherein the structural layer of the test road comprises a surface layer, a base layer and a soil base layer;
the temperature control reference point for determining each structural layer of the test road comprises the following steps: and determining the temperature control reference point of the surface layer of the test road, the temperature control reference point of the base layer and the temperature control reference point of the soil base layer.
5. The method for controlling the temperature of the linear road accelerated loading test device based on the operation energy consumption of claim 1, wherein the temperature control mode comprises an above-ground temperature control mode, an underground temperature control mode and a combination of the above-ground temperature control mode and the underground temperature control mode.
6. The temperature control method of the linear road accelerated loading test device based on the operation energy consumption as claimed in claim 5, wherein the influence of different temperature control modes of the temperature control system on each structural layer of the test road is analyzed through a temperature rise simulation test, and the temperature control mode of each structural layer of the test road is determined based on the analysis result, comprising:
the influence of three temperature control modes, namely, ground temperature control, underground temperature control and combination of the ground temperature control and the underground temperature control, on each structural layer of the test road is analyzed through a temperature rise simulation test, and the temperature control mode of each structural layer of the test road is determined according to the temperature rise economy and the overall temperature distribution of each structural layer of the test road.
7. The method for controlling the temperature of the linear road accelerated loading test device based on the operation energy consumption of claim 1, wherein the temperature control parameters comprise the air outlet speed and the hot air temperature of the temperature control system.
8. The method for controlling the temperature of the linear road accelerated loading test device based on the operation energy consumption according to claim 1, wherein the analyzing the reliability of the steel structure of the linear road accelerated loading test device in the temperature control stage comprises:
analyzing the influence of the temperature control system on the steel structure temperature field of the linear road accelerated loading test device, and establishing a fluid-solid coupling finite element model based on the analysis result;
solving the temperature stress distribution of the steel structure based on the fluid-solid coupling finite element model;
and analyzing the reliability of the steel structure in the temperature control stage based on the temperature stress distribution.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112539994A (en) * | 2020-12-21 | 2021-03-23 | 北京科技大学 | Linear road accelerated loading test method and system based on fatigue damage |
| CN113063683A (en) * | 2021-03-10 | 2021-07-02 | 北京科技大学 | Road surface structure service behavior contrast test method based on accelerated loading test |
| WO2023179165A1 (en) * | 2022-03-25 | 2023-09-28 | 山东交通学院 | Annular flow-dividing accelerated loading environmental cabin |
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