Cold region engineering model test system

Abstract

The embodiment of the invention provides a cold region engineering model test system, which relates to the technical field of roadbed test and comprises a simulation box, a refrigeration unit, an illumination radiation unit, a wind speed simulation unit, a rainfall simulation unit, a data acquisition unit and an image acquisition unit. The simulation box is used for positioning a to-be-tested roadbed; the refrigeration unit, the illumination radiation unit, the wind speed simulation unit, the rainfall simulation unit, the data acquisition unit and the image acquisition unit are all mounted in the simulation box; the refrigeration unit is used for adjusting the temperature in the simulation box; the rainfall simulation unit is used for adjusting the humidity in the simulation box; and the data acquisition unit is used for acquiring environmental parameters in the simulation box and the state of the to-be-tested roadbed. By simulating various environments, the environment where the test roadbed is located is closer to the real service condition, the accuracy and reliability of the test result can be improved, and theoretical guidance and technical support can be provided for engineering construction in the cold region.

Description

Technical Field

[0001] The invention relates to the technical field of roadbed testing, and in particular to a cold region engineering model testing system. Background Art

[0002] At present, with the continuous deepening of economic construction, cold region engineering construction will face unprecedented rapid development, and a large number of major cold region projects have been completed, are under construction or are being planned. Due to the particularity of the natural environment in which they are located, cold region projects have far more engineering diseases than other projects, so the model test before the actual implementation of the project is particularly important. The freeze-thaw phenomenon is an invisible killer that threatens the stability, safety and durability of geotechnical engineering in cold regions. The primary and secondary disasters caused by it will cause huge economic losses. Effectively preventing the occurrence of diseases and promptly eliminating the impact of diseases on the use function of highways is a topic with practical application and research. The slope is an indispensable part of the overall structure of the highway. There are more protection measures for the stability of slopes in non-frozen areas than in frozen soil, so actively carrying out research on related technologies in seasonally frozen areas plays a particularly important role in maintaining the stability of slopes.

[0003] The inventors found in their research that the existing cold region roadbed test has at least the following disadvantages:

[0004] The prior art does not have a complete environmental simulation test system, and has problems such as poor accuracy of test results. Summary of the invention

[0005] The purpose of the present invention includes, for example, providing a cold region engineering model test system, which can simulate a variety of environments, so that the environment of the test roadbed is closer to the actual service conditions, can improve the accuracy and reliability of the test results, and can provide theoretical guidance and technical support for cold region engineering construction.

[0006] The embodiments of the present invention can be implemented as follows:

[0007] In a first aspect, the present invention provides a cold region engineering model test system, comprising:

[0008] A simulation box, a refrigeration unit, a light radiation unit, a wind speed simulation unit, a rainfall simulation unit, a data acquisition unit and an image acquisition unit; the simulation box is used to locate the roadbed to be tested; the refrigeration unit, the light radiation unit, the wind speed simulation unit, the rainfall simulation unit, the data acquisition unit and the image acquisition unit are all installed in the simulation box; the refrigeration unit is used to adjust the temperature in the simulation box; the rainfall simulation unit is used to adjust the humidity in the simulation box; the data acquisition unit is used to obtain the environmental parameters in the simulation box and the state of the roadbed to be tested.

[0009] In an optional embodiment, a positioning frame is provided in the simulation box, and the refrigeration unit, the light radiation unit, the wind speed simulation unit and the rainfall simulation unit are all installed on the positioning frame.

[0010] Based on the above solution, the refrigeration unit, light radiation unit, wind speed simulation unit and rainfall simulation unit are positioned by a positioning frame, and the position of each unit is accurate and reliable; multiple units are integrated together, and the cooperation between them is closer, and the simulated environment is closer to the actual working conditions.

[0011] In an optional embodiment, the positioning frame includes a first frame and a second frame, the first frame is connected to the second frame, the first frame is arranged on one side of the second frame, the refrigeration unit and the wind speed simulation unit are both installed on the first frame; the light radiation unit and the rainfall simulation unit are both installed on the second frame.

[0012] Based on the above solution, by distributing the multiple units on the first frame and the second frame and rationally designing the position of each unit, the multiple units will not interfere with each other, which is convenient for installation and more closely matched.

[0013] In an optional embodiment, the second frame includes a support member and a top plate, one end of the support member is fixed to the bottom of the simulation box, and the other end is connected to the top plate, and the light radiation unit and the rainfall simulation unit are both installed on the top plate.

[0014] Based on the above scheme, the top plate is supported by supporting members, and sufficient space is formed under the top plate to facilitate positioning of the roadbed to be tested under the top plate. The light radiation unit and rainfall simulation unit located on the top plate can provide better light and rainfall for the roadbed to be tested, thereby better simulating the light and rainy environment.

[0015] In an optional embodiment, the positioning frame further includes an air regulating grille, the air regulating grille is connected to the second frame, and the air regulating grille is located at an air outlet side of the wind speed simulation unit.

[0016] Based on the above scheme, the wind blown out by the wind speed simulation unit passes through the air regulating grille and then blows toward the roadbed to be tested. The wind acting on the roadbed to be tested is softer, and the wind blowing toward the roadbed to be tested covers a wide area. The wind is not easy to concentrate on a local position of the roadbed to be tested, and is not easy to cause damage to the roadbed to be tested. At the same time, the grid size or density of the air regulating grille can be locally adjusted as needed, thereby changing the stress conditions at different positions of the roadbed to be tested, and simulating a closer real working condition.

[0017] In an optional embodiment, the refrigeration unit includes a temperature-controlled base plate, which is installed at the bottom of the simulation box, and the temperature-controlled base plate is used to support the roadbed to be tested.

[0018] Based on the above solution, the temperature-controlled base plate can adjust the temperature of the bottom of the roadbed to be tested, which is more in line with the actual working conditions during the service of the roadbed.

[0019] In an optional embodiment, the wind speed simulation unit includes a refrigeration fan and a variable frequency fan, the refrigeration fan and the variable frequency fan are both installed on the first frame, and the variable frequency fan is located above the refrigeration fan.

[0020] Based on the above scheme, the basic wind speed of the refrigeration fan and the variable frequency fan are superimposed to simulate the wind conditions of the roadbed to be tested, and the simulation effect is good.

[0021] In an optional embodiment, the rainfall simulation unit includes a plurality of rainfall nozzles, and the plurality of rainfall nozzles are all mounted on the second frame.

[0022] Based on the above solution, through the coordination of multiple rainfall sprinklers, rainfall of different sizes and directions can be simulated.

[0023] In an optional embodiment, an annular drainage groove is provided in the simulation box, and the annular drainage groove encloses a positioning area for positioning the roadbed to be tested.

[0024] Based on the above scheme, the water generated during the test can be discharged from the annular drainage ditch and is not easy to accumulate in the simulation box. The roadbed to be tested is not easy to be soaked in rainwater and is not easy to affect the test results of the roadbed to be tested.

[0025] In an optional embodiment, an air duct for circulating air is provided in the simulation box.

[0026] Based on the above scheme, through the design of the air duct, the wind in the simulation box can circulate along the set path. When the wind speed simulation unit is operating, it is not easily affected by the air in the simulation box, which makes it easy to control the wind force and direction.

[0027] The beneficial effects of the embodiments of the present invention include, for example:

[0028] In summary, the cold region engineering model test system provided in this embodiment includes a simulation box, a refrigeration unit, a light radiation unit, a wind speed simulation unit, a rainfall simulation unit, a data acquisition unit and an image acquisition unit. The simulation box is used to locate the roadbed to be tested. The refrigeration unit, the light radiation unit, the wind speed simulation unit, the rainfall simulation unit, the data acquisition unit and the image acquisition unit are all installed in the simulation box. The refrigeration unit is used to adjust the temperature in the simulation box; the rainfall simulation unit is used to adjust the humidity in the simulation box. The data acquisition unit is used to obtain the environmental parameters in the simulation box and the state of the roadbed to be tested. Through the cooperation of multiple units, different environments can be simulated in the simulation box, so that the environment of the roadbed to be tested is closer to the actual working conditions, and the test results are highly accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A schematic diagram of a cold region engineering model test system according to an embodiment of the present application;

[0031] Figure 2 This is a control flow chart of the cold region engineering model test system according to an embodiment of the present application.

[0032] icon:

[0033] 001-roadbed to be tested; 100-simulation box; 101-air duct; 110-annular drainage trough; 200-refrigeration unit; 210-temperature control base plate; 300-light radiation unit; 310-lamp tube; 400-wind speed simulation unit; 410-refrigeration fan; 420-frequency conversion fan; 500-rainfall simulation unit; 510-rainfall nozzle; 600-data acquisition unit; 700-image acquisition unit; 800-intelligent control unit; 900-first frame; 910-second frame; 930-air adjustment grille. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0037] In the description of the present invention, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, they are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the product of the invention is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0039] It should be noted that, in the absence of conflict, the features in the embodiments of the present invention may be combined with each other.

[0040] The freeze-thaw phenomenon is an invisible killer that threatens the stability, safety and durability of geotechnical engineering in cold regions. The primary and secondary disasters caused by it will cause huge economic losses. Effectively preventing the occurrence of diseases and promptly eliminating the impact of diseases on the use function of highways is a topic with practical application and research. In the prior art, there is no complete system designed for the freeze-thaw test of roadbeds, and independent tests can only be performed in a single environment. The single environment is very different from the actual working conditions during the service of the roadbed, and the accuracy of the test results is poor.

[0041] In view of this, the designer provides a cold region engineering model test system that can simulate a variety of environments. During the test, the environment in which the roadbed 001 to be tested is closer to its actual working conditions during service, thereby improving the accuracy of the test results.

[0042] Please refer to Figure 1 and Figure 2 This embodiment provides a cold region engineering model test system, including a simulation box 100, a refrigeration unit 200, a light radiation unit 300, a wind speed simulation unit 400, a rainfall simulation unit 500, a data acquisition unit 600 and an image acquisition unit 700. The simulation box 100 is used to locate the roadbed to be tested 001; the refrigeration unit 200, the light radiation unit 300, the wind speed simulation unit 400, the rainfall simulation unit 500, the data acquisition unit 600 and the image acquisition unit 700 are all installed in the simulation box 100; the refrigeration unit 200 is used to adjust the temperature in the simulation box 100; the rainfall simulation unit 500 is used to adjust the humidity in the simulation box 100; the data acquisition unit 600 is used to obtain the environmental parameters in the simulation box 100 and the state of the roadbed to be tested 001.

[0043] As mentioned above, the cold region engineering model test system provided by this embodiment simulates the temperature environment in the simulation box 100 through the refrigeration unit 200, simulates the light environment in the simulation box 100 through the light radiation unit 300, simulates the wind environment in the simulation box 100 through the wind speed simulation unit 400, and simulates the rainy environment in the simulation box 100 through the rainfall simulation unit 500. The data acquisition unit 600 can monitor the parameters of the roadbed 001 to be tested in the test process in real time, which is conducive to automatic data collection and storage. The image acquisition unit 700 can not only play the role of recording the test process, but also play the role of monitoring the operation status of the entire test system. In this way, the cooperation of multiple units makes the test environment of the roadbed 001 to be tested closer to the actual working conditions, and the test results are highly accurate.

[0044] It should be noted that the cold region engineering model test system can also be configured with an intelligent control unit 800, which can be a PLC controller. The intelligent control unit 800 is simultaneously communicated with the refrigeration unit 200, the light radiation unit 300, the wind speed simulation unit 400, the rainfall simulation unit 500, the data acquisition unit 600 and the image acquisition unit 700, and can perform automated integrated control of all units, thereby improving control accuracy and timeliness, and providing a more realistic simulation environment.

[0045] The following embodiments illustrate the details of the cold region engineering model test system provided in this application by way of examples.

[0046] Please refer to Figure 1 and Figure 2 In this embodiment, optionally, a positioning frame is provided in the simulation box 100, and the positioning frame includes a first frame 900 and a second frame 910. The first frame 900 is connected to the second frame 910, and the first frame 900 is arranged on one side of the second frame 910. The refrigeration unit 200 and the wind speed simulation unit 400 are both installed on the first frame 900; the light radiation unit 300 and the rainfall simulation unit 500 are both installed on the second frame 910.

[0047] Optionally, the second frame 910 includes a support member and a top plate, one end of the support member is fixed to the bottom of the simulation box 100, and the other end is connected to the top plate, and the light radiation unit 300 and the rainfall simulation unit 500 are both installed on the top plate. The top plate is supported by the support member, and sufficient space is formed under the top plate, so that the roadbed to be tested 001 is positioned under the top plate. The light radiation unit 300 and the rainfall simulation unit 500 located on the top plate can provide better light and rainfall for the roadbed to be tested 001, thereby better simulating the light and rainy environment.

[0048] Please refer to Figure 1 and Figure 2In other embodiments, the positioning frame may further include an air-adjusting grille 930, which is connected to the second frame 910 and is located at the wind outlet side of the wind speed simulation unit 400. The wind blown out by the wind speed simulation unit 400 passes through the air-adjusting grille 930 and then blows toward the roadbed to be tested 001. The wind acting on the roadbed to be tested 001 is softer, and the wind blowing toward the roadbed to be tested 001 covers a wide area, so the wind is not easy to concentrate on a local position of the roadbed to be tested 001, and is not easy to cause damage to the roadbed to be tested 001. At the same time, the mesh size and mesh density of the air-adjusting grille 930 can be locally adjusted as needed, thereby changing the wind conditions at different positions of the roadbed to be tested 001, and the simulation effect is closer to the actual working condition.

[0049] In this embodiment, optionally, the refrigeration unit 200 includes a compression refrigeration unit, a condenser, an evaporator, a defrost system, refrigeration pipes and insulation measures and valves.

[0050] Optionally, the compression refrigeration unit, condenser, evaporator, refrigeration pipeline and valve components need to be adapted to each other and form a refrigeration closed loop.

[0051] In some embodiments, optionally, the compression refrigeration unit can be a semi-enclosed piston compressor, equipped with a check valve, a crankcase heater, an oil pressure difference protector and a mechanical oil balancer, equipped with a welded and painted unit base and bracket, and optionally equipped with a ball valve and a check valve for the exhaust pipeline, equipped with a removable and cleanable high-efficiency oil separator, an oil storage tank and an oil line filter, equipped with a liquid storage tank with a liquid level display and a low liquid level alarm, equipped with a replaceable suction filter, and equipped with a pressure controller. The pipelines of the unit can all be connected with copper pipes. Its control circuit is equipped with a main air switch, and each compressor has an independent air switch, which can manually realize the switching between full load and partial load. Its phase loss protector has low voltage, overvoltage, phase sequence and phase loss protection functions, and is equipped with an electronic controller to balance the compressor operation time and accurately control the start and stop of the compressor. The centralized controller can also be replaced according to demand, which can realize the conversion between electronic automatic control and mechanical control. Even if the electronic control system fails, the system can still maintain normal operation.

[0052] Optionally, the condenser adopts an evaporative condenser, and the evaporative cooling circulating liquid pump adopts an external form. It uses liquid and air as cooling media to condense the high-temperature gaseous refrigerant in the coil into liquid. The condenser is equipped with a liquid distribution system, a condensing coil group, a packing heat exchange layer, a deliquidator, etc.; the outside is equipped with a circulating liquid pump, an electronic liquid descaling device, and an axial flow fan on the top of the coil side. Under the action of the axial flow fan, the inside of the condensation chamber is in a negative pressure state. During operation, the condensed liquid passes through the liquid distribution system and is evenly and completely covered on the surface of the coil under the action of strong wind force. The high-temperature gaseous refrigerant enters from the top of the coil, and the condensed liquid refrigerant flows out from the bottom of the coil.

[0053] Optionally, refrigeration pipelines use seamless steel pipes for conveying fluids; refrigerant pipelines use seamless steel pipes; pipeline welding uses argon arc welding for base and arc welding for cover, and pipeline welds should be inspected by radiography.

[0054] Optionally, the thermal insulation measures adopt flame retardant rubber and plastic thermal insulation materials, and the thickness is based on refrigeration standards.

[0055] Optionally, the defrost system adopts a water defrosting method.

[0056] It should be noted that all valves, instruments and automatic control components of the refrigeration unit 200 are made of Freon-specific products.

[0057] Optionally, the refrigeration unit 200 uses a pulsed electronic expansion valve, and the adaptive superheat can be calculated by measuring the evaporator outlet temperature and pressure values, thereby accurately controlling the opening of the electronic expansion valve.

[0058] Optionally, the refrigeration unit 200 further includes a temperature-controlled base plate. The temperature-controlled base plate 210 is installed at the bottom of the simulation box 100 . The temperature-controlled base plate 210 is used to support the roadbed 001 to be tested.

[0059] In this embodiment, the light radiation unit 300 optionally includes a plurality of lamp tubes 310. The electronic dimming (potentiometer) of the artificial sun simulation emitter of the light radiation unit 300 can manually control the dimming of each lamp tube 310 individually or automatically control the dimming of the entire lamp tube 310. The dual functions of manual switch and microcomputer control can switch each group of light sources.

[0060] Optionally, the spectrum of the lamp tube 310 of the light radiation unit 300 complies with AM 1.5 level.

[0061] Optionally, the light radiation unit 300 is provided with a microcomputer communication interface, which can realize simultaneous monitoring by a microcomputer.

[0062] Optionally, the light radiation unit 300 should be provided with a high voltage device and a leakage protector to ensure working safety.

[0063] In this embodiment, optionally, the wind speed simulation unit 400 includes a cooling fan 410 and a variable frequency fan 420, both of which are installed on the first frame 900, and the variable frequency fan 420 is located above the cooling fan 410. By superimposing the basic wind speed of the cooling fan 410 and the variable frequency fan 420, the wind condition of the roadbed 001 to be tested is closer to the actual working condition.

[0064] It should be noted that an air duct 101 for air circulation is formed in the simulation box 100. Through the design of the air duct 101, the wind in the simulation box 100 can circulate along the set path. When the wind speed simulation unit 400 is operating, it is not easily affected by the air in the simulation box 100, which facilitates the regulation of wind force and wind direction.

[0065] In this embodiment, optionally, the rainfall simulation unit 500 includes a plurality of rainfall nozzles 510, and the plurality of rainfall nozzles 510 are all installed on the top plate of the second frame 910. The plurality of nozzles cooperate to achieve the effect of simulating artificial rainfall and realize all industrial control functions. The rainfall simulation unit 500 can realize programmable control of effective rainfall area, rainfall intensity, and raindrop size.

[0066] In addition, the rainfall simulation unit 500 has two modes: manual and automatic. When a problem occurs with the microcomputer, the rainfall system can be controlled in manual mode.

[0067] It should be noted that the specifications of multiple sprinkler heads can be different, thus forming artificial automatic simulated rainfall with continuously adjustable rainfall intensity from small to large, raindrop shape, and rainfall uniformity similar to natural rainfall. The measurement and control components of each pipeline are connected with a flexible joint to facilitate maintenance.

[0068] Optionally, the rainfall simulation unit 500 uses a feedback control algorithm to repeatedly and infinitely approach the set rainfall intensity value during the entire rainfall period, so that a real, accurate and stable rainfall process can be automatically obtained.

[0069] Optionally, an annular drainage groove 110 is provided in the simulation box 100, and the annular drainage groove 110 forms a positioning area for positioning the roadbed to be tested 001. Water generated during the test can be discharged from the annular drainage groove 110, and is not easy to accumulate in the simulation box 100, and the roadbed to be tested 001 is not easy to be soaked in rainwater, and is not easy to affect the test results of the roadbed to be tested 001.

[0070] When controlling rainfall, by adjusting the working states of the rainfall nozzles 510 at different positions, regional rainfall can be achieved on the roadbed 001 to be tested.

[0071] In this embodiment, optionally, the data acquisition unit 600 includes sensors such as temperature, heat flow, moisture, soil water potential, pressure, deformation, salinity, wind speed, radiation, etc., which can collect various parameters during the test.

[0072] In this embodiment, optionally, the image acquisition unit 700 includes multiple sets of imaging equipment and display devices. The image acquisition unit 700 not only plays a role in recording the test process, but also plays a role in monitoring the operation status of the entire test system.

[0073] In this embodiment, the intelligent control unit 800 optionally includes a touch screen, and the touch screen can display parameters such as temperature, suction pressure, exhaust pressure, injection temperature, energy level, motor current, operating time and real-time time of the cold region engineering model test system. In addition, the intelligent control unit 800 has automatic defrosting, automatic protection, alarm and memory functions, automatic load increase and decrease adjustment functions according to load, and manual debugging, local automatic, remote automatic and other control modes, which can fully automatically control the test process.

[0074] It should be understood that the cold region engineering model test system is equipped with dual monitoring functions of on-site microcomputer and handheld mobile. The handheld monitor can detect the working status of the simulator, measure the working environment: ambient temperature, humidity, wind speed, radiation, atmospheric pressure and other meteorological elements and other indicators, and can log on to the Internet.

[0075] In summary, the cold region engineering model test system provided in this embodiment can simulate various environments in the simulation box 100 through the cooperation of the refrigeration unit 200, the light radiation unit 300, the wind speed simulation unit 400, the rainfall simulation unit 500, the data acquisition unit 600 and the image acquisition unit 700, so as to provide an environment close to the actual working conditions for the roadbed to be tested 001 during the test process. The test results of the roadbed to be tested 001 are more accurate and reliable, which can provide theoretical guidance and technical support for cold region engineering construction.

[0076] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A cold region engineering model test system, characterized in that: include: A simulation box (100), a refrigeration unit (200), a light radiation unit (300), a wind speed simulation unit (400), a rainfall simulation unit (500), a data acquisition unit (600) and an image acquisition unit (700); the simulation box (100) is used to locate a roadbed to be tested (001); the refrigeration unit (200), the light radiation unit (300), the wind speed simulation unit (400), the rainfall simulation unit (500), the data acquisition unit (600) and the image acquisition unit (700) are all installed in the simulation box (100); the refrigeration unit (200) is used to adjust the temperature in the simulation box (100); the rainfall simulation unit (500) is used to adjust the humidity in the simulation box (100); and the data acquisition unit (600) is used to obtain environmental parameters in the simulation box (100) and the state of the roadbed to be tested (001).

2. The cold region engineering model test system according to claim 1 is characterized in that: A positioning frame is provided in the simulation box (100), and the refrigeration unit (200), the light radiation unit (300), the wind speed simulation unit (400) and the rainfall simulation unit (500) are all installed on the positioning frame.

3. The cold region engineering model test system according to claim 2 is characterized in that: The positioning frame comprises a first frame (900) and a second frame (910), the first frame (900) is connected to the second frame (910), the first frame (900) is arranged on one side of the second frame (910), the refrigeration unit (200) and the wind speed simulation unit (400) are both installed on the first frame (900); the light radiation unit (300) and the rainfall simulation unit (500) are both installed on the second frame (910).

4. The cold region engineering model test system according to claim 3 is characterized by: The second frame (910) comprises a support member and a top plate, one end of the support member is fixed to the bottom of the simulation box (100), and the other end is connected to the top plate, and the light radiation unit (300) and the rainfall simulation unit (500) are both installed on the top plate.

5. The cold region engineering model test system according to claim 3 is characterized by: The positioning frame further comprises an air adjustment grille (930), the air adjustment grille (930) being connected to the second frame body (910), and the air adjustment grille (930) being located at the air outlet side of the wind speed simulation unit (400).

6. The cold region engineering model test system according to claim 3 is characterized by: The refrigeration unit (200) comprises a temperature control base plate (210), the temperature control base plate (210) is installed at the bottom of the simulation box (100), and the temperature control base plate (210) is used to support the roadbed (001) to be tested.

7. The cold region engineering model test system according to claim 3 is characterized by: The wind speed simulation unit (400) comprises a refrigeration fan (410) and a variable frequency fan (420); the refrigeration fan (410) and the variable frequency fan (420) are both installed on the first frame (900); and the variable frequency fan (420) is located above the refrigeration fan (410).

8. The cold region engineering model test system according to claim 3 is characterized by: The rainfall simulation unit (500) comprises a plurality of rainfall nozzles (510), and the plurality of rainfall nozzles (510) are all installed on the second frame (910).

9. The cold region engineering model test system according to claim 1 is characterized by: An annular drainage groove (110) is arranged in the simulation box (100), and the annular drainage groove (110) encloses a positioning area for positioning the roadbed (001) to be tested.

10. The cold region engineering model test system according to claim 1, characterized in that: The simulation box (100) is provided with an air duct (101) for circulating air.

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