Scale test device of ground penetrating radar for road detection and test method thereof

Abstract

The invention belongs to the technical field of road detection, and particularly relates to a reduced scale test device and method for ground penetrating radar for road detection, and the device comprises a reduced scale model box, the top end of the reduced scale model box is open, the reduced scale model box is filled with soil, and the bottom of the reduced scale model box is provided with walking wheels; the simulation and layering assembly is arranged in the soil filled in the reduced scale model box, and the simulation and layering assembly is used for simulating road diseases and layering the soil in the reduced scale model box; the reflected wave suppression assembly is arranged on the inner wall of the reduced scale model box, and the reflected wave suppression assembly is used for absorbing detection waves emitted by the ground penetrating radar; and the auxiliary assembly is arranged on the outer side of the reduced scale model box. According to the invention, roads under different working conditions can be simulated indoors so as to be detected by the ground penetrating radar. A large amount of data of the ground penetrating radar can be obtained with low test cost, and a reliable way is provided for construction of a hidden disease recognition training set and calibration of the water content recognition relation.

Description

Technical Field

[0001] The present invention belongs to the technical field of road detection, and in particular relates to a scaled test device and a test method of a ground penetrating radar for road detection. Background Art

[0002] Ground-penetrating radar (GPR) technology for roads can rapidly and non-destructively detect hidden road defects and the moisture content of roadbed soil. Combined with machine learning algorithms, it can also automatically identify defects. However, using GPR to train an automatic identification model for hidden road defects requires a large amount of measured data. In actual road inspections, hidden defects are sparsely distributed. Furthermore, obtaining accurate information about hidden defects requires core drilling and sampling, which is costly in terms of both labor and material resources.

[0003] On the other hand, when using ground-penetrating radar to detect the moisture content of the roadbed, it is necessary to establish a correlation between the dielectric constant of the soil and the radar wave signal. If relevant test sections are set up in the actual project for calibration, there will be problems such as uncontrollable soil moisture content, high test costs, and insufficient data volume.

[0004] Therefore, it is necessary to design a scaled test device and test method for ground penetrating radar for road detection to solve the above problems. Summary of the Invention

[0005] The present invention aims to provide a scaled-down test device and method for ground-penetrating radar (GPR) road inspection. This device simulates different road conditions indoors for GPR inspection. This device can acquire a large amount of GPR data at a low test cost, providing a reliable approach for constructing training sets for latent disease identification and calibrating moisture content recognition relationships.

[0006] To achieve the above-mentioned object, the present invention provides the following solution: a scaled test device for a ground-penetrating radar for road detection, comprising:

[0007] The scale model box has an open top, is filled with soil, and has running wheels at the bottom;

[0008] A simulation and stratification component is provided in the soil filled in the scale model box, and is used to simulate road damage and stratify the soil in the scale model box;

[0009] a reflected wave suppression component, disposed on the inner wall of the scale model box, and configured to absorb detection waves emitted by the ground penetrating radar;

[0010] The auxiliary component is arranged on the outside of the scale model box.

[0011] In a scaled test device for a ground-penetrating radar for road inspection according to the present invention, the simulation and stratification component includes a disease setting box and a stratified reflection baffle. The disease setting box is used to simulate road diseases, and the stratified reflection baffle is used to stratify the soil in the scaled model box.

[0012] According to the scaled test device of the ground penetrating radar for road detection of the present invention, the road diseases simulated by the disease setting box include hole hidden diseases, water-rich hidden diseases, and loose hidden diseases.

[0013] In the scaled test device of a ground penetrating radar for road detection according to the present invention, the reflected wave suppression component includes an electromagnetic wave absorbing layer, and the electromagnetic wave absorbing layer is arranged on the inner bottom wall and the inner side wall of the scaled model box.

[0014] A scaled test device for a ground-penetrating radar for road detection based on the present invention, the scaled model box includes a base plate, the base plate is rectangular, and the top ends of the two short sides and one long side of the base plate are respectively fixedly connected to fixed baffles, the three fixed baffles are vertically arranged, and the ends of any two adjacent fixed baffles are fixedly connected, and the top end of the other long side of the base plate is detachably connected to a detachable baffle, and the end of the detachable baffle is detachably connected to the end of the fixed baffle fixed to the top end of the short side of the base plate.

[0015] In the scaled test device of the ground penetrating radar for road detection according to the present invention, the detachable baffle is detachably connected to the end of the fixed baffle via a latch.

[0016] According to the scaled test device of a ground penetrating radar for road detection of the present invention, the auxiliary component includes a movable step and a movable slope, and the movable step and the movable slope are symmetrically arranged at the two ends of the outer side of the scaled model box, the movable step is close to one short side of the base plate, and the movable slope is close to the other short side of the base plate.

[0017] In the scaled test device of the ground penetrating radar for road detection according to the present invention, the wall material of the disease setting box is acrylic.

[0018] In the scaled-down test device of the ground-penetrating radar for road detection according to the present invention, the traveling wheels are provided with brake devices.

[0019] A test method for a scaled test device of a ground penetrating radar for road detection comprises the following steps:

[0020] Assemble the scale model box, install the reflected wave suppression component on the inner wall of the assembled scale model box, and then move the scale model box to the test position;

[0021] Fill the scale model box with soil to the location of the damage and / or layering and tamp it down;

[0022] Place the simulation and layering components at the diseased and / or layered locations;

[0023] Continue filling the soil and tamping it;

[0024] Scanning using ground-penetrating radar;

[0025] Collect and process ground penetrating radar scan data.

[0026] Compared with the prior art, the present invention has the following advantages and technical effects:

[0027] The test device of the present invention can solve the problems of uncontrollable working conditions and high test costs in the detection of hidden road diseases and roadbed moisture content. It can realize the rapid and controllable accumulation of radar spectrum data under multiple working conditions, thereby forming a huge ground-penetrating radar detection database, providing rich training resources for the calibration of ground-penetrating radar detection of roadbed moisture content and the training of machine learning models for ground-penetrating radar detection of hidden road diseases, and has extremely strong practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive efforts.

[0029] Figure 1 It is an overall schematic diagram of the present invention;

[0030] Figure 2 Schematic diagram of the disease setting box of the present invention;

[0031] Figure 3 This is a schematic diagram of a layered reflective baffle according to the present invention;

[0032] Figure 4 This is a schematic diagram of the process of detecting hidden road hazards according to the present invention;

[0033] Figure 5 This is a schematic diagram of the process of detecting the moisture content of the roadbed according to the present invention.

[0034] Among them, 1. fixed baffle; 2. removable baffle; 3. latch; 4. movable step; 5. movable slope; 6. electromagnetic wave absorbing layer; 7. box wall. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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 making creative efforts are within the scope of protection of the present invention.

[0036] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Reference Figures 1 to 5 As shown, the present invention provides a scaled test device for a ground penetrating radar for road detection, comprising:

[0038] The scale model box has an open top, is filled with soil, and has walking wheels at the bottom;

[0039] The simulation and stratification component is arranged in the soil filled in the scale model box, and is used to simulate road diseases and stratify the soil in the scale model box;

[0040] A reflection wave suppression component is arranged on the inner wall of the scale model box, and is used to absorb detection waves emitted by the ground penetrating radar;

[0041] The auxiliary component is arranged on the outside of the scale model box.

[0042] Furthermore, the simulation and stratification components include a disease setting box and a stratified reflection baffle. The disease setting box is used to simulate road diseases, and the stratified reflection baffle is used to stratify the soil in the scaled model box.

[0043] The layered reflective baffles are iron sheets, with an area equal to the interior surface area of ​​the scaled model box, ensuring complete coverage of the soil layer when inserted. This allows for flexible adjustment of the thickness of the subgrade soil layer under test, simulating a variety of actual working conditions and adapting to moisture content testing at different fill heights.

[0044] Furthermore, the road diseases simulated by the disease setting box include hidden diseases of holes, hidden diseases of water-rich areas, and hidden diseases of looseness.

[0045] Furthermore, the reflected wave suppression component includes an electromagnetic wave absorbing layer 6, which is provided on the inner bottom wall and the inner side wall of the scale model box.

[0046] The electromagnetic wave absorbing layer 6 can eliminate the reflection of the ground penetrating radar wave on the box wall, thereby generating noise that affects the collection of radar signals.

[0047] Furthermore, the scale model box includes a bottom plate, which is rectangular. The top ends of the two short sides and one long side of the bottom plate are respectively fixedly connected with fixed baffles 1. The three fixed baffles 1 are vertically arranged, and the ends of any two adjacent fixed baffles 1 are fixedly connected. The top end of the other long side of the bottom plate is detachably connected with a removable baffle 2, and the end of the removable baffle 2 is detachably connected to the end of the fixed baffle 1 fixed on the top end of the short side of the bottom plate.

[0048] The fixed baffle 1 is used to provide lateral restraint for the road material. The fixed baffle 1, which is welded perpendicularly to the short side of the bottom plate, is marked with a scale line indicating the distance from the top of the scale model box.

[0049] Furthermore, the detachable baffle 2 is detachably connected to the end of the fixed baffle 1 via the latch 3 .

[0050] The removable baffle 2 has two purposes: first, it facilitates the cleaning of materials in the scale model box after the test; second, it makes it more convenient to replace the diseased structure in the scale model box and adjust the layer thickness of the soil roadbed during the test.

[0051] Furthermore, the auxiliary components include a movable step 4 and a movable slope 5, which are symmetrically arranged at both ends of the outer side of the scale model box, the movable step 4 is close to one short side of the bottom plate, and the movable slope 5 is close to the other short side of the bottom plate.

[0052] The height of the movable step 4 is consistent with that of the scale model box, and the material is iron, stainless steel or other load-bearing materials. Its purpose is to provide support for the test personnel when operating on the scale model box.

[0053] The height of the movable slope 5 is consistent with the height of the scale model box, and the material is consistent with the movable step 4. Its purpose is to allow some test equipment to be easily moved up and down to the top of the scale model box for test personnel to operate.

[0054] Furthermore, the box wall 7 of the disease setting box is made of acrylic.

[0055] Furthermore, the traveling wheel is provided with a brake device.

[0056] The baseplate, located at the bottom of the scale model box, supports the vertical load of the road material. The running wheels facilitate transportation of the scale model box. The running wheels have brakes to prevent the scale model box from slipping during experiments.

[0057] A test method for a scaled test device of a ground penetrating radar for road detection comprises the following steps:

[0058] Assemble the scale model box, install the reflected wave suppression component on the inner wall of the assembled scale model box, and then move the scale model box to the test position;

[0059] Fill the scale model box with soil to the location of the damage and / or layering and tamp it down;

[0060] Place the simulation and layering components at the diseased and / or layered locations;

[0061] Continue filling the soil and tamping it;

[0062] Scanning using ground-penetrating radar;

[0063] Collect and process ground penetrating radar scan data.

[0064] Example 1: Scaled test of detecting hidden road cavity defects using ground penetrating radar.

[0065] Fix the running wheels at the bottom of the scale model box, connect the removable baffle 2 to the two surrounding fixed baffles 1 with the latch 3, and stick the electromagnetic wave absorbing layer 6 on the inner wall of the scale model box;

[0066] Fill the soil to the expected location of the simulated cavity damage according to the roadbed material of the actual project, and use a small tamping machine to compact it;

[0067] A disease setting box is placed on the compacted roadbed without adding any filler to simulate the roadbed void situation under real working conditions;

[0068] Continue backfilling the soil to the top of the scale model box. Personnel and equipment go up to the top via the movable steps 4 and the movable ramp 5 to compact the backfill soil.

[0069] The ground penetrating radar is transported to the top of the scale model box via the movable ramp 5 for scanning and detection;

[0070] Acquire and process ground penetrating radar data.

[0071] Example 2: Scaled test of ground penetrating radar to detect hidden water-rich road damage.

[0072] Fix the running wheels at the bottom of the scale model box, connect the removable baffle 2 to the two surrounding fixed baffles 1 with the latch 3, and stick the electromagnetic wave absorbing layer 6 on the inner wall of the scale model box;

[0073] Fill the soil to the expected location of the simulated water-rich disease according to the roadbed material of the actual project, and use a small tamping machine to compact it;

[0074] A disease setting box is placed on the compacted roadbed, and a water-soil mixture is added to the box as filler to simulate the water-rich roadbed under real working conditions;

[0075] Continue backfilling the soil to the top of the scale model box. Personnel and equipment go up to the top via the movable steps 4 and the movable ramp 5 to compact the backfill soil.

[0076] The ground penetrating radar is transported to the top of the scale model box via the movable ramp 5 for scanning and detection;

[0077] Acquire and process ground penetrating radar data.

[0078] Example 3: Scaled test of detecting loose and hidden road defects using ground penetrating radar.

[0079] Fix the running wheels at the bottom of the scale model box, connect the removable baffle 2 to the two surrounding fixed baffles 1 with the latch 3, and stick the electromagnetic wave absorbing layer 6 on the inner wall of the scale model box;

[0080] Fill the roadbed material according to the actual project to the expected location where loose diseases are expected to occur, and use a small tamping machine to compact it;

[0081] A disease setting box is placed on the compacted roadbed, and loose soil is added into the box as filler to simulate the looseness of the roadbed under real working conditions;

[0082] Continue backfilling the soil to the top of the scale model box. Personnel and equipment go up to the top via the movable steps 4 and the movable ramp 5 to compact the backfill soil.

[0083] The ground penetrating radar is transported to the top of the scale model box via the movable ramp 5 for scanning and detection;

[0084] Acquire and process ground penetrating radar data.

[0085] Example 4: Scaled test of detecting the moisture content of roadbed using ground penetrating radar.

[0086] Fix the running wheels at the bottom of the scale model box, connect the removable baffle 2 to the two surrounding fixed baffles 1 with the latch 3, and stick the electromagnetic wave absorbing layer 6 on the inner wall of the scale model box;

[0087] Fill and tamp the soil according to the actual roadbed material of the project. The moisture content of the fill soil is pre-set according to the test design. Stop when the reading on the scale line of the fill top surface reaches the test set value;

[0088] Laying layered reflective baffles on top of the fill;

[0089] Continue backfilling the soil to the top of the scale model box. Personnel and equipment go up to the top via the movable steps 4 and the movable ramp 5 to compact the backfill soil.

[0090] The ground penetrating radar is transported to the top of the scale model box via the movable ramp 5 for scanning and detection;

[0091] Collect and process ground penetrating radar data;

[0092] Take more than three soil samples from the upper part of the layered reflective baffle and determine the moisture content using the drying method.

[0093] In the description of the present invention, it should be understood that the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention, rather than indicating or implying 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.

[0094] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection of the present invention.

Claims

1. A scaled test device for a ground penetrating radar for road detection, characterized in that: include: The scale model box has an open top, is filled with soil, and has running wheels at the bottom; A simulation and stratification component is provided in the soil filled in the scale model box, and is used to simulate road damage and stratify the soil in the scale model box; a reflected wave suppression component, disposed on the inner wall of the scale model box, and configured to absorb detection waves emitted by the ground penetrating radar; The auxiliary component is arranged on the outside of the scale model box.

2. A scaled test device for a ground penetrating radar for road detection according to claim 1, characterized in that: The simulation and stratification component includes a disease setting box and a stratified reflection baffle. The disease setting box is used to simulate road diseases, and the stratified reflection baffle is used to stratify the soil in the scaled model box.

3. A scaled test device for a ground penetrating radar for road detection according to claim 2, characterized in that: The road diseases simulated by the disease setting box include hole hidden diseases, water-rich hidden diseases, and loose hidden diseases.

4. The scaled test device for a ground penetrating radar for road detection according to claim 1, characterized in that: The reflected wave suppression component comprises an electromagnetic wave absorbing layer (6), and the electromagnetic wave absorbing layer (6) is arranged on the inner bottom wall and the inner side wall of the scale model box.

5. The scaled test device for a ground penetrating radar for road detection according to claim 1, characterized in that: The scale model box comprises a bottom plate, which is rectangular. The top ends of two short sides and one long side of the bottom plate are respectively fixedly connected to fixed baffles (1). The three fixed baffles (1) are vertically arranged, and the ends of any two adjacent fixed baffles (1) are fixedly connected. The top end of the other long side of the bottom plate is detachably connected to a detachable baffle (2), and the end of the detachable baffle (2) is detachably connected to the end of the fixed baffle (1) fixed to the top end of the short side of the bottom plate.

6. A scaled test device for a ground penetrating radar for road detection according to claim 5, characterized in that: The detachable baffle (2) is detachably connected to the end of the fixed baffle (1) via a latch (3).

7. The scaled test device for a ground penetrating radar for road detection according to claim 5, characterized in that: The auxiliary component comprises a movable step (4) and a movable slope (5), wherein the movable step (4) and the movable slope (5) are symmetrically arranged at two ends of the outer side of the scale model box, the movable step (4) is close to one short side of the bottom plate, and the movable slope (5) is close to the other short side of the bottom plate.

8. The scaled test device for a ground penetrating radar for road detection according to claim 2, characterized in that: The box wall (7) of the disease setting box is made of acrylic.

9. The scaled test device for a ground penetrating radar for road detection according to claim 1, characterized in that: The traveling wheel is provided with a brake device.

10. A test method for a scaled test device of a ground penetrating radar for road detection according to any one of claims 1 to 9, characterized in that: The following steps are involved: Assemble the scale model box, install the reflected wave suppression component on the inner wall of the assembled scale model box, and then move the scale model box to the test position; Fill the scale model box with soil to the location of the damage and / or layering and tamp it down; Place the simulation and layering components at the diseased and / or layered locations; Continue filling the soil and tamping it; Scanning using ground-penetrating radar; Collect and process ground penetrating radar scan data.

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