Simulation experiment device and method for internal void of airport runway

Abstract

The invention relates to a simulation experiment device and method for internal void of an airport runway, and a real airport runway is simulated by filling a runway structure layer in a simulation test box. An air bag system is buried in the runway structure layer, and air bags made of elastic materials are used for simulating internal void of the airport runway. The air bag is controlled to be inflated and deflated through the pressure valve, so that the air bag is adjustable, the void conditions of different shapes, sizes and depths are accurately simulated, and the void conditions are matched with actual airport runway diseases. Static and dynamic loading is carried out on the surface of the runway structure layer, the void effect under the load condition is simulated, the mechanical behavior of the runway under the airplane heavy load effect is helped to be researched, and the diversity and practicability of the experiment are improved. Compared with the prior art, a reliable experimental platform is provided for researching the mechanical influence of void on the runway structure, a scientific basis is provided for early detection, evaluation and repair schemes of actual runway void diseases, and the efficiency and accuracy of runway maintenance work are improved.

Description

Technical Field

[0001] The invention relates to the field of road performance analysis, and in particular to a simulation experiment device and method for the internal de-airing of an airport runway. Background Art

[0002] During the use of airport runways, the soil beneath the pavement often becomes hollow due to factors such as uneven foundation settlement, groundwater flow, and underground cave formation. The hollowing out will lead to a decrease in the bearing capacity of the pavement structure, causing cracks, potholes and other defects, which will seriously affect the safety and service life of the runway.

[0003] The invention patent application with the invention number CN114280283A discloses a visual road hollowing simulation and load-bearing test platform and method, in which a road base structure filled in a model box and ice blocks are set in the road base structure to simulate road hollows. This invention patent focuses on detecting the hollowing situation that already exists inside the road, but cannot simulate the hollowing process inside the road.

[0004] The invention patent application with the invention number CN103048172A discloses a test box for simulating the local uneven deformation of the road soil foundation or base structure. A vertical drawer that can be raised and lowered is provided in the box filled with fine sand. The drawer is raised and lowered to simulate the soil foundation or base phenomena such as the settlement and frost heave of the road surface. This invention patent can only simulate the road hollowing phenomenon caused by the settlement of the bottom of the model, but cannot simulate the hollowing phenomenon in the middle of the roadbed. Summary of the invention

[0005] The purpose of the present invention is to overcome the defects of the above-mentioned prior art and to provide a simulation experimental device and method for the internal air gap of an airport runway which can accurately simulate air gaps of different shapes, sizes and depths.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] According to one aspect of the present invention, there is provided a simulation experiment device for the hollowing out of an airport runway, comprising a simulation test box, a runway structure layer, an airbag system and an information collection system; the runway structure layer is constructed in the simulation test box by layered filling according to the actual runway structure; the airbag system comprises an airbag, an air nozzle, an air hole, an air pipe and an air valve, the airbag is located in the runway structure layer, the air hole is located on the surface of the airbag, the air pipe passes through the air hole and connects the air valve and the inside of the airbag, and the air nozzle is located at the end of the air pipe inside the airbag; the information collection system comprises an endoscope and a pressure gauge, the endoscope is located inside the airbag, and the pressure gauge is connected to the end of the air pipe at the air valve.

[0008] Furthermore, the runway structure layer includes a runway surface layer, a runway base layer and a subgrade arranged in sequence from top to bottom; the runway surface layer is composed of cement concrete or asphalt concrete materials; the runway base layer is composed of sand and gravel, graded crushed stone or cement stabilized materials; the subgrade is a structure with a specific bearing capacity formed by a granular filler through a compaction process.

[0009] Furthermore, the thickness and material composition of the runway surface layer, runway base layer and track foundation within the runway structure layer can be adjusted according to experimental requirements.

[0010] Furthermore, the shape, size, number and placement of the airbag system in the runway structure layer are determined according to the test plan.

[0011] Furthermore, the information collection system also includes a sensor, a data transmission line and an electronic display screen, and the data transmission line connects the sensor and the endoscope to the electronic display screen.

[0012] Furthermore, the sensors include an earth pressure box, a strain gauge and a displacement sensor, the number and position of the sensors are determined according to the test plan, and the earth pressure box, the strain gauge and the displacement sensor are all connected to the data transmission line.

[0013] Furthermore, the airbag is made of elastic material with sealing properties.

[0014] According to another aspect of the present invention, there is provided a simulation experiment method, comprising the following steps:

[0015] Build a model of the airport runway structure;

[0016] Apply static load or dynamic load to the airport runway structure model according to test requirements;

[0017] The real-time mechanical data of the runway structure layer in the model is collected through the information acquisition system, and the response changes of the runway structure are monitored in real time for data recording and subsequent analysis as needed;

[0018] The internal state of the airbag is monitored in real time through the information collection system. If the air pressure inside the airbag changes, the gas is replenished or released through the air valve to ensure that the inflation state of the airbag remains stable.

[0019] Furthermore, the steps for building the airport runway structure model include:

[0020] In the simulation test chamber, the runway structure layer is filled in layers according to the actual runway structure, and the roadbed, runway base layer and runway surface layer are laid;

[0021] Determine the location where information needs to be collected, and bury the information collection system when the runway structure layer is filled to the corresponding location;

[0022] Determine the position where the simulated runway needs to be hollowed out. When the runway structure layer is filled to the corresponding position, compact the completed runway structure layer, place the airbag at the predetermined hollowing position, and start inflating through the air valve; after the air pressure reaches the set value, fix the position of the airbag and lead the air pipe and line upward along the edge of the simulation test box, and connect them to the external monitoring equipment of the information collection system;

[0023] Check the working condition of the assembled airbag system. If it works normally, continue to lay the runway structure layer on top of it and complete the construction of the runway structure model layer by layer.

[0024] Furthermore, the real-time mechanical data of the runway structure layer in the model collected by the information acquisition system includes stress, strain, displacement, etc., and the internal state information of the airbag monitored in real time by the information acquisition system includes video or image data obtained by an endoscope and the internal pressure level data of the airbag obtained by a pressure gauge.

[0025] Compared with the prior art, the present invention has the following advantages:

[0026] 1. The present invention simulates a real airport runway by filling a runway structure layer in a simulation test box. The runway structure layer includes a roadbed, a runway base layer and a runway surface layer filled in sequence from bottom to top. An airbag system is buried in the runway structure layer, and an airbag made of elastic material is used to simulate the internal hollowing of the airport runway. The inflation and deflation of the airbag is controlled by a pressure valve to achieve the adjustability of the airbag, accurately simulating hollowing conditions of different shapes, sizes and depths, ensuring consistency with actual airport runway diseases, and providing a reliable experimental platform for studying the mechanical influence of hollowing on the runway structure. By statically and dynamically loading the surface of the runway structure layer, the hollowing effect under load conditions is simulated, which helps to study the mechanical behavior of the runway under heavy aircraft loads and increases the diversity and practicality of the experiment. This method provides a scientific basis for the early detection, evaluation and repair of actual runway hollowing diseases, and improves the efficiency and accuracy of runway maintenance work.

[0027] 2. The present invention arranges an endoscope in the airbag and a sensor in the runway structure layer. The endoscope combined with the sensor system can monitor the dynamic changes of the void area in real time, such as crack development and roadbed settlement, and provide accurate mechanical data such as displacement, stress and pressure through data transmission lines and electronic display screens, which greatly improves the controllability of the experiment and the reliability of data. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the simulation experimental device for the internal degassing of the airport runway.

[0029] In the figure: 1. Simulation test box; 2. Runway surface layer; 3. Runway base layer; 4. Roadbed; 5. Airbag; 6. Endoscope; 7. Air nozzle; 8. Air hole; 9. Data transmission line; 10. Air pipe; 11. Air valve; 12. Air pressure gauge; 13. Electronic display screen; 14. Sensor. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0031] like Figure 1 As shown, the model test device is based on the model test box 1. The simulation test box 1 is the basic structure of the entire test and is used to accommodate the airport runway structure layer and the airbag system. The size and material of the simulation test box 1 are adjusted according to the test requirements, and the internal space should be sufficient to accommodate the multi-layer components of the runway structure layer to ensure stability under different de-airing conditions.

[0032] The runway structure inside the simulation test box 1 is divided into a subgrade 4, a runway base layer 3 and a runway surface layer 2. The runway surface layer 2 is usually made of cement concrete or asphalt concrete materials, which is used to simulate the deformation and crack development of the pavement under the heavy load of the aircraft. The runway base layer 3 is located below the surface layer, which plays the role of transferring loads and reducing the overall stress of the runway. The runway base layer 3 is usually composed of sand, gravel, graded crushed stone or cement stabilized materials, and is mainly used to enhance the overall stiffness and strength of the runway. The subgrade 4 is the bearing layer of the runway surface layer. The subgrade uses different granular materials, such as crushed stone, sand or other common subgrade fillers, and forms a structure with a specific bearing capacity through a compaction process. The thickness and material type of the runway structure in the simulation test box 1 can be adjusted according to specific test requirements, and various sensors 14 are buried in each layer according to specific needs, including strain gauges, soil pressure cells, displacement sensors, etc.

[0033] In this embodiment, the simulation of the internal hollowing of the airport runway structure is mainly based on the airbag system. The airbag system includes an airbag 5, an air nozzle 7, an air hole 8, an air pipe 10 and an air valve 11. The airbag 5 is located inside the runway structure. The specific position can be adjusted according to demand to simulate the hollowing phenomenon caused by groundwater loss, soil subsidence or cavitation on the actual runway. The airbag 5 is made of an elastic material with good sealing performance to ensure that the hollowing state can be accurately controlled during the test. As a preferred embodiment, a rubber airbag 5 is used. According to different test schemes, the airbag 5 can be set to different shapes and sizes to simulate a single or multiple hollowing areas and test the impact of hollowing on the runway structure at different positions.

[0034] The rubber airbag 5 is connected to the external air valve 11 through the air nozzle 7 and the air pipe 8, and can be inflated or deflated at any time, dynamically adjusting the expansion degree of the rubber airbag 5, accurately controlling the size and shape of the hollow area, and simulating different degrees of hollow diseases. The air pipe 8 is connected to the outside with a barometer 12 to monitor the internal pressure level of the airbag 5 at any time.

[0035] As a preferred embodiment, the material of the air pipe 8 is pressure-resistant and wear-resistant, and can maintain good air tightness under different air pressure conditions. The gas flow and pressure delivered through the air pipe 8 are key parameters for the degassing simulation, and the length and caliber of the air pipe 8 can be customized according to the test requirements to ensure the stability of gas transmission.

[0036] An endoscope 6 is placed inside the rubber airbag 5 and connected to an external electronic display screen 13 via a data transmission line 9 to observe the internal conditions of the rubber airbag 5 and the de-airing area, such as crack development near the contact surface between the roadbed 4 and the airbag 5, soil loss, etc. The video and image data provided by the endoscope 6 can provide an intuitive basis for subsequent de-airing analysis and repair measures.

[0037] In this embodiment, the endoscope 6 and the sensor 14 buried inside the runway are connected to the external electronic display screen 13 via the data transmission line 9, and the experimental data collected by the sensor 14 and the barometer 12 are displayed in real time, including the pressure, displacement, stress, deformation and other information of the runway structure. The electronic display screen 13 intuitively reflects the mechanical response of the runway structure in the empty state.

[0038] As a preferred embodiment, the portions of the data transmission line 9 and the air pipe 10 extending in the runway structure layer are sheathed with PVC pipes to protect the data transmission line 9 and the air pipe 10 from damage.

[0039] 1. Assembly of degassing system

[0040] The present invention uses an airbag system to simulate the degassing phenomenon in the runway structure. During the assembly process of the airbag system, the endoscope 6 and the air nozzle 7 for monitoring are first placed inside the uninflated rubber airbag 5. The endoscope 6 is used to observe the state inside the airbag 5 in real time, such as the expansion condition, the fluidity of the gas, and the contact change between the rubber airbag and the surrounding roadbed. The air nozzle 7 is the key interface for the inflation and deflation of the airbag 5. Gas can be injected into or released into the airbag 5 through the air nozzle 7 to control the inflation and deflation of the airbag 5.

[0041] The data transmission line 9 and the air tube 10 built into the airbag 5 are led out through the air hole 8 and are connected to the electronic display screen 13 and the barometer 12 respectively. The electronic display screen 13 can monitor the internal conditions of the airbag 5 in real time, such as the changes in the internal environment after the airbag 5 is inflated, the formation of air voids and changes in shape, etc. The barometer 12 is used to monitor the changes in the air pressure inside the airbag 5 to ensure that the pressure inside the airbag 5 is always within the set range, so as to avoid failure of the airbag 5 or test deviation due to excessively high or low air pressure.

[0042] An air valve 11 is installed next to the barometer 12 to flexibly control the inflow and outflow of gas. The design of the air valve 11 can replenish or extract gas from the airbag 5 when necessary, adjust the air pressure change in the airbag 5, accurately control the expansion degree of the airbag 5, and then accurately simulate different degrees of degassing.

[0043] 2. Construction of airport runway structure model

[0044] In the simulation test box 1, the actual runway structure is filled in layers. First, the roadbed 4 is laid in the test box, and compacted soil or gravel is usually used as the roadbed material. The runway base layer 3 is laid on the roadbed 4, and the base material can be gravel, asphalt-stabilized crushed stone or cement-stabilized material according to the test requirements. Finally, the runway surface layer 2 is laid on the base layer, and the surface layer is usually made of cement concrete or asphalt concrete.

[0045] When constructing the runway structure model, corresponding sensors 14 are buried at different levels according to the test requirements. These sensors 14 include earth pressure cells, strain gauges, displacement sensors, etc., which can monitor the mechanical response and deformation of each layer in real time. The material thickness and compaction of each layer must be constructed strictly in accordance with the standards of the actual airport runway to ensure that the mechanical behavior of the model is consistent with that of the actual runway.

[0046] After the compaction of the corresponding runway structure layer is completed, the rubber airbag 5 is placed at the predetermined empty position and starts to be inflated through the air valve 11. After the air pressure reaches the set value, the position of the airbag 5 is fixed and the data transmission line 9 and the air pipe 10 are protected by the PVC pipe to prevent them from being damaged during subsequent construction. The data line 9 and the air pipe 10 are led upward along the edge of the simulation test box 1 to facilitate connection with external monitoring equipment.

[0047] After the airbag system is assembled and verified to work properly, the base layer and the surface layer are laid on top of it to complete the construction of the runway structure layer by layer. During the laying process, the state inside the airbag 5 can be monitored in real time through the barometer 12 and the electronic display screen 13, and the pressure inside the airbag 5 can be adjusted in time through the air valve 11 to ensure that the airbag 5 can stably simulate the emptying phenomenon at different stages.

[0048] 3. Formal test

[0049] Once the runway structure model is completed, formal testing can begin.

[0050] Load application: Apply a set load on the surface of the runway surface layer 2. You can choose to apply a static load or a dynamic load according to the test requirements.

[0051] Sensor data acquisition: The sensors 14 embedded in the runway structure collect mechanical data in real time, including stress, strain, displacement, etc. These data are transmitted to the electronic display screen 13 through the data transmission line 9. The experimenter can monitor the response changes of the runway structure in real time through the electronic display screen 13, and record and analyze the data as needed.

[0052] Dynamic monitoring and adjustment: Under the action of load, the experimenter needs to closely monitor the state inside the airbag 5 to ensure that the emptying phenomenon can be continuously simulated. During the test, the barometer 12 displays the air pressure inside the airbag 5 in real time, and the electronic display screen 13 displays the specific changes in the emptying area. If the air pressure inside the airbag 5 changes, the gas can be replenished or released through the gas valve 11 to ensure that the expansion state of the airbag 5 remains stable.

[0053] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A simulation experimental device for the internal de-airing of an airport runway, characterized in that: It comprises a simulation test box (1), a runway structure layer, an airbag system and an information collection system; the runway structure layer is formed by filling in layers according to the actual runway structure in the simulation test box (1); The airbag system comprises an airbag (5), an air nozzle (7), an air hole (8), an air tube (10) and an air valve (11); the airbag (5) is located in the runway structure layer; the air hole (8) is located on the surface of the airbag (5); the air tube (10) passes through the air hole (8) and connects the air valve (11) and the inside of the airbag (5); the air nozzle (7) is located at the end of the air tube (10) inside the airbag (5); The information collection system comprises an endoscope (6) and a pressure gauge (12), wherein the endoscope (6) is located inside the airbag (5), and the pressure gauge (12) is connected to the end of the trachea (10) at the air valve (11).

2. The simulation experimental device for the internal de-airing of an airport runway according to claim 1, characterized in that: The runway structure layer comprises a runway surface layer (2), a runway base layer (3) and a roadbed (4) arranged in sequence from top to bottom; the runway surface layer (2) is composed of cement concrete or asphalt concrete material; the runway base layer (3) is composed of sandstone, graded crushed stone or cement stabilized material; the roadbed (4) is a structure with a specific load-bearing capacity formed by a granular filler through a compaction process.

3. The simulation experimental device for the internal de-airing of an airport runway according to claim 2, characterized in that: The thickness and material composition of the runway surface layer (2), the runway base layer (3) and the track foundation (4) in the runway structure layer can be adjusted according to experimental requirements.

4. The simulation experimental device for the internal de-airing of an airport runway according to claim 1, characterized in that: The shape, size, number and placement position of the airbag system in the runway structure layer are determined according to the test plan.

5. The simulation experiment device for the internal de-airing of an airport runway according to claim 1, characterized in that: The information collection system further comprises a sensor (14), a data transmission line (9) and an electronic display screen (13), wherein the data transmission line (9) connects the sensor (14) and the endoscope (6) with the electronic display screen (13).

6. The simulation experiment device for the internal de-airing of an airport runway according to claim 5, characterized in that: The sensors (14) include an earth pressure box, a strain gauge and a displacement sensor. The number and position of the sensors (14) are determined according to a test plan. The earth pressure box, the strain gauge and the displacement sensor are all connected to a data transmission line (9).

7. The simulation experiment device for the internal de-airing of an airport runway according to claim 1, characterized in that: The airbag (5) is made of elastic material with sealing properties.

8. A simulation experiment method of a simulation experiment device for the hollowing out of an airport runway as claimed in any one of claims 1 to 7, characterized in that: The following steps are involved: Build a model of the airport runway structure; Apply static load or dynamic load to the airport runway structure model according to test requirements; The real-time mechanical data of the runway structure layer in the model is collected through the information acquisition system, and the response changes of the runway structure are monitored in real time for data recording and subsequent analysis as needed; The internal state of the airbag (5) is monitored in real time through the information acquisition system. If the air pressure in the airbag (5) changes, the gas is replenished or released through the air valve (11) to ensure that the expansion state of the airbag (5) remains stable.

9. The method according to claim 8, characterized in that The steps of building the airport runway structure model include: In a simulation test box (1), a runway structure layer is layered and filled according to the actual runway structure, and a roadbed (4), a runway base layer (3) and a runway surface layer (2) are laid; Determine the location where information needs to be collected, and bury the information collection system when the runway structure layer is filled to the corresponding location; Determine the position where the simulated runway needs to be hollowed out, and when the runway structure layer is filled to the corresponding position, compact the completed runway structure layer, place the air bag (5) at the predetermined hollowing position, and start to inflate through the air valve (11); after the air pressure reaches the set value, fix the position of the air bag (5) and lead the air pipe (10) and the line upward along the edge of the simulation test box (1), and connect them to the external monitoring equipment of the information collection system; Check the working condition of the assembled airbag system. If it works normally, continue to lay the runway structure layer on top of it and complete the construction of the runway structure model layer by layer.

10. The method according to claim 8, characterized in that The real-time mechanical data of the runway structure layer in the model collected by the information acquisition system includes stress, strain, and displacement, and the internal state information of the airbag (5) monitored in real time by the information acquisition system includes video or image data obtained by an endoscope (6) and internal pressure level data of the airbag (5) obtained by a barometer (12).

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