CN113311506A - Testing device and testing method for ground penetrating radar - Google Patents
Testing device and testing method for ground penetrating radar Download PDFInfo
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- CN113311506A CN113311506A CN202110753562.3A CN202110753562A CN113311506A CN 113311506 A CN113311506 A CN 113311506A CN 202110753562 A CN202110753562 A CN 202110753562A CN 113311506 A CN113311506 A CN 113311506A
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- G—PHYSICS
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- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
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Abstract
The invention discloses a testing device and a testing method of a ground penetrating radar, and the testing device comprises a base provided with a testing groove body, wherein the testing groove body is internally filled with a simulation device for simulating a pavement structure and internal defect diseases; the simulation device comprises a pavement surface layer, a pavement base layer, a sand filling body for simulating a roadbed and different disease body models arranged in the sand filling body; the simulation device can place different disease body models in the sand filling body according to the test requirements to form different simulation devices; and the pavement surface layer, the pavement base layer and the test groove body are detachably assembled. The device can simultaneously satisfy the test of the ground-coupled radar or the air-coupled radar. The invention realizes modeling of the road thickness test and the hidden disease test of the ground penetrating radar technology, can effectively test the detection capability of the ground penetrating radar on the road surface thickness and the road surface defects, realizes the unification, the convenience, the high efficiency and the standardization of the test process, and is suitable for popularization and application.
Description
Technical Field
The invention relates to the field of road engineering, in particular to a testing device and a testing method of a ground penetrating radar, which can be used for testing the detection capability of the ground penetrating radar on the thickness of a pavement structure layer and the internal defects of a pavement.
Background
The ground penetrating radar is an electromagnetic technology which adopts radio waves to detect the distribution of underground media and scan invisible targets or underground interfaces to determine the internal structural form or position of the ground penetrating radar. The working method and the principle are as follows: the high-frequency electromagnetic wave is transmitted by the transmitting antenna in a broadband pulse form, reflected or transmitted by the target body, and received by the receiving antenna. When the high-frequency electromagnetic wave propagates in the medium, the path, the electromagnetic field intensity and the waveform of the high-frequency electromagnetic wave change along with the electrical properties and the aggregation form of the medium passing through, so that the space position or the structural state of the underground interface or the target body can be determined through the acquisition, processing and analysis of the time-domain waveform.
At present, the ground penetrating radar technology at home and abroad is rapidly developed, equipment manufacturers and equipment models are diversified, and a unified, convenient, efficient and standard testing device and a testing method are lacked aiming at the radar detection of the road thickness and the radar detection of the road defects in road engineering.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a testing device and a testing method of a ground penetrating radar, so that the detection capability of the ground penetrating radar on the thickness of a pavement structure layer and the internal defects of a pavement can be uniformly, conveniently, efficiently and normatively tested.
In order to solve the technical problems, the following technical scheme is adopted:
a testing device of a ground penetrating radar is used for testing the detection capability of the ground penetrating radar on the thickness of a road surface and the detection capability of the ground penetrating radar on the defects of the road surface; the testing device comprises a base provided with a testing groove body, and a simulation device for simulating a pavement structure and internal defect diseases is filled in the testing groove body; the simulation device comprises a pavement surface layer, a pavement base layer, a sand filling body for simulating a roadbed and different disease body models for being placed in the sand filling body; the simulation device can place different disease body models in the sand filling body according to the test requirements to form different simulation devices; and the pavement surface layer, the pavement base layer and the test groove body are detachably assembled.
As a further improvement of the invention, the ground penetrating radar is a ground coupling radar or an air coupling radar; the test tank body is characterized in that a sliding rail is arranged on the upper surface of the base on one side of the test tank body, a moving frame is mounted on the sliding rail, an extending end extending to the upper portion of the test tank body is arranged on the moving frame, and the extending end is used for mounting an air coupling antenna.
Further, one side of the test groove body is in a form of a openable plate, and a base surface of the lower portion of the openable plate is inclined downwards to form a sand unloading sliding surface.
Furthermore, the pavement surface layer is 5-15 cm, the pavement base layer is 18-30 cm, and the sand filling body of the simulated roadbed is 1.5-2.0 m; the base is of a concrete structure.
Further, the disease model comprises a cavity model, a void model, a water-rich model and a loose model.
Further, the testing device also comprises a radar wave speed calibration device.
Further, the radar wave velocity calibration device comprises a pavement surface layer with preset thickness and a steel plate at the bottom for calibration; the device also comprises a calibration steel plate, and the calibration steel plate is used for being placed at the bottom of a sand filling body of the simulation roadbed without the internal damaged body model during calibration.
The invention also provides a test method of the ground penetrating radar, which utilizes the test device of the ground penetrating radar to test the pavement thickness detection capability and the pavement defect detection capability of the ground penetrating radar, and comprises the following steps:
(1) calibrating the wave speed of the radar:
obtaining a first radar calibration wave velocity V1The device is used for testing the detection capability of the pavement thickness;
obtaining a second radar calibration wave velocity V2The device is used for testing the detection capability of the pavement defects;
(2) and (3) testing the thickness of the ground penetrating radar road surface:
detecting a pavement surface layer of a specified sample by using a ground penetrating radar, and calibrating a wave speed V by using a first radar1And the two-way travel time t of the radar measured surface layer1' calculation of the actual measured thickness h of the pavement surface of the sample1’；
h1’＝V1 t1’/2
According to the measured thickness h1Comparing the actual thickness of the specified sample with the actual thickness of the specified sample to judge whether the pavement thickness detection capability is accurate or not;
(3) and (3) testing the defects of the ground penetrating radar road surface:
detecting a disease body model with specified type, burial depth and size by using a ground penetrating radar, and calibrating the wave velocity V by using a second radar2Mine and mineReaching actual measurement two-way travel time t2' calculation of actual measurement buried depth h of disease model2'; determining the type and the plane size of the lesion body according to the corresponding map characteristics of each lesion body in the specification;
h2’＝V2 t2’/2
according to the actual measurement of the buried depth h2' comparing the characteristic map and the plane size with corresponding parameters of an actual disease model, and judging whether the pavement defect detection capability is accurate.
Further, in the step (1):
first radar calibration wave velocity V1The acquisition mode is as follows: selecting a pavement surface layer structure with preset thickness and a steel plate at the bottom for radar wave velocity calibration to obtain a first radar wave velocity V1；
Second radar calibration wave velocity V2The acquisition mode is as follows: additionally laying a steel plate at the bottom of the test tank body, and sequentially laying a sand filling structure, a pavement base layer structure and a pavement surface layer structure of the simulated roadbed without the disease bodies on the steel plate; calibrating the wave velocity of the radar to obtain a second radar wave velocity V2。
By adopting the technical scheme, the invention at least has the following advantages:
1. the ground penetrating radar testing device provided by the invention realizes modeling of road thickness testing and hidden disease testing in the ground penetrating radar technology, can effectively test the detection capability of the ground penetrating radar on the road surface thickness and the road surface defects, and realizes unification, convenience, high efficiency and standardization of the testing process.
2. When the radar wave velocity is calibrated, the radar wave velocity can be calibrated more accurately by adopting a form of adding a steel plate at the bottom.
3. The testing device can be simultaneously suitable for the ground coupling type radar or the air coupling type radar, and a special sliding rail is arranged for the antenna of the air coupling type radar, so that the operation is convenient and efficient.
4. The openable plate is formed on one side of the test groove, the base surface on the lower portion of the openable plate is inclined downwards to form a sand unloading sliding surface, and when the disease model is replaced, sand can directly slide off, so that sand unloading is convenient.
5. The invention adopts the mode of firstly calibrating the wave speed of the radar and then replacing the simulation device according to different test requirements, and the test result is accurate and comprehensive.
Drawings
The foregoing is only an overview of the technical solutions of the present invention, and in order to make the technical solutions of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description.
FIG. 1 is a schematic side view of a testing apparatus for a ground penetrating radar according to an embodiment of the present invention;
FIG. 2 is a schematic top view of the testing apparatus of the ground penetrating radar of FIG. 1;
FIG. 3 is an enlarged partial schematic view of the middle portion of FIG. 2;
FIG. 4 is a schematic front view of the testing device of the ground penetrating radar in FIG. 1;
FIG. 5 is an enlarged partial schematic view of the middle portion of FIG. 4;
FIG. 6 is a schematic diagram of a hole model;
FIG. 7 is a schematic view of a void model;
FIG. 8 is a schematic diagram of a water-rich model;
FIG. 9 is a schematic diagram of a loose body model.
Detailed Description
The invention designs and develops a set of ground penetrating radar testing device which is used for testing the detection capability of the ground penetrating radar on the road surface thickness and the detection capability of the road surface defects. The testing mechanism of the testing device is as follows: the detection performance of the ground penetrating radar is tested by establishing a road site model with hidden diseases, and two simulation environments of radar thickness measurement and radar defect measurement are switched by a specially designed device, so that convenience and high efficiency are realized.
Based on the above testing mechanism, with reference to fig. 1-5, the present embodiment provides a testing apparatus for a ground penetrating radar, which includes a base 1, the base 1 is provided with a testing tank 11, and a simulation apparatus 2 for filling a simulated pavement structure and internal defect diseases in the testing tank 11; the simulation device 2 comprises a pavement surface layer 21, a pavement base layer 22, a sand filling body 23 for simulating a roadbed and different disease body models 24 for being placed in the sand filling body 23; the simulation device 2 can place different disease body models in the sand filling body according to the test requirements to form different simulation devices; and the pavement surface layer 21 and the pavement base layer 22 are detachably assembled with the test groove body 11, wherein the pavement surface layer 21 and the pavement base layer 22 are integrally arranged in a detachable assembly mode.
The device preferably satisfies the test work of ground coupling formula radar and air coupling formula radar antenna performance simultaneously, is provided with slide rail 3 at the base 1 upper surface of test cell body 11 one side, installs on the slide rail 3 and removes frame 4, removes to be provided with on the frame 4 and extends to the extension end 41 of test cell body 11 top, and extension end 41 is used for installing air coupling antenna 5, through the air coupling antenna detection test region.
The test area in the test groove body 11 is required to simulate the actual conditions of the road site as much as possible, a pavement surface layer 21 with the thickness of 5-15 cm and a pavement base layer 22 with the thickness of 18-30 cm are generally arranged, the pavement surface layer 21 and the pavement base layer 22 are detachable in an assembled mode, a sand filling body 23 with the thickness of 1.5-2.0 m is filled in the lower portion to simulate the roadbed, in addition, a cavity model 241 (figure 6), a void model 242 (figure 7), a water-rich body model 243 (figure 8) and a loose body model 244 (figure 9) can be respectively designed according to the test requirements, and the solid models with different types of diseases are buried in the sand filling body 23 according to different depths and different sizes according to the actual requirements. The base 1 should be cast using concrete. Meanwhile, it is preferable that one side surface of the test tank 11 is provided with a openable plate 6, and a surface of the base 1 at a lower portion of the openable plate 6 is inclined downward to form a sand-discharging sliding surface.
The road internal defects are simulated as follows:
hollow model
Filling part of sand to the appointed depth of the model, placing the cavity model at the appointed position (as shown in figure 6), and then pouring the residual sand into the device, so that the cavity model is buried in the sand filling body, the upper surface of the sand filling body is tightly contacted with the interface of the pavement base layer, and no gap can be left.
② void model
Filling part of filled sand to the appointed depth of the model, placing the void model at the appointed position below the pavement base (as shown in figure 7), and then pouring the residual filled sand into the device, so that the void model is buried in the sand filling body, and the upper surface of the filled sand is tightly contacted with the interface of the pavement base and can not leave a gap.
③ Rich water body model
Filling part of sand to the appointed depth of the model, placing the water-rich model filled with water at the appointed position (as shown in figure 8), and then pouring the residual sand into the device, so that the water-rich model is buried in the sand filling body, the upper surface of the sand filling body is tightly contacted with the interface of the pavement base layer, and no gap can be left.
Loosening model
Filling part of sand to the appointed depth of the model, placing the loose body model at the appointed position (as shown in figure 9), and then pouring the residual sand into the device, so that the loose body model is buried in the sand filling body, the upper surface of the sand filling body is tightly contacted with the interface of the pavement base layer, and no gap can be reserved.
The testing device can simulate the actual situation of a road site according to the testing requirement, and further comprises a radar wave speed calibration device for testing accuracy. The radar wave velocity calibration device comprises a pavement surface layer with preset thickness and a steel plate at the bottom for calibration; the device also comprises a calibration steel plate, and the calibration steel plate is used for being placed at the bottom of a sand filling body of the simulation roadbed without the internal damaged body model during calibration.
The test method of the test device comprises the following steps:
(1) calibrating the wave speed of the radar:
a, obtaining a first radar calibration wave velocity V for testing the pavement thickness detection capability1(ii) a Specifically, the method comprises the following steps:
selecting a predetermined thickness h1(bottom layer additionally paved with steel plate) pavement surface layer sample, sampling test is carried out by using radar, and time difference t between direct wave signal and sample bottom layer reflected wave signal is recorded1(t is the distance of two-way travel), the actual propagation path length h of the radar.
Deltax is 1/2 distance between the transmitting end and the receiving end, and if Deltax is approximate to 0 according to actual conditions, the first radar calibrates the wave velocity V1Comprises the following steps:
V1＝2h1/t1
B. obtaining a second radar calibration wave velocity V for testing the detection capability of the road surface defect2(ii) a Specifically, the method comprises the following steps:
selecting a predetermined thickness h2(bottom layer additionally paved with steel plate) roadbed and pavement samples (the steel plate is additionally paved at the bottom of the test tank body, and then the sand filling body, the pavement base layer and the pavement surface layer of the simulation roadbed without the disease body are sequentially paved on the steel plate), a radar is used for sampling test, and the time difference t between the wave peak of the direct wave signal and the reflection wave peak of the sample bottom layer is recorded2(t is the time of the two-way trip). Then the radar wave velocity V2Comprises the following steps:
V2＝2h2/t2
(2) and (3) testing the thickness of the ground penetrating radar road surface:
detecting a pavement surface layer of a specified sample by using a ground penetrating radar, and calibrating a wave speed V by using a first radar1And the two-way travel time t of the radar measured surface layer1' calculation of the actual measured thickness h of the pavement surface of the sample1’；
h1’＝V1 t1’/2
According to the measured thickness h1Comparing the actual thickness of the specified sample with the actual thickness of the specified sample to judge whether the pavement thickness detection capability is accurate or not;
(3) and (3) testing the defects of the ground penetrating radar road surface:
detecting disease body model (such as figures 6-9) with specified type, burial depth and size by using ground penetrating radar, and calibrating wave velocity V by using a second radar2And the actual measurement of the radar with two travel time t2' calculation of actual measurement buried depth h of disease model2'; determining the type and the plane size of the lesion body according to the corresponding map characteristics of each lesion body in the specification;
h2’＝V2 t2’/2
according to the actual measurement of the buried depth h2' feature map, plane sizeAnd comparing the road surface defect detection capability with corresponding parameters of an actual disease model to judge whether the road surface defect detection capability is accurate.
Wherein, according to the technical standard of urban underground disease comprehensive detection and risk assessment (JGJ 437-2018), the map specification is as follows.
TABLE 1 typical disease Radar profile characteristics
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention in any way, and it will be apparent to those skilled in the art that the above description of the present invention can be applied to various modifications, equivalent variations or modifications without departing from the spirit and scope of the present invention.
Claims (9)
1. The device for testing the ground penetrating radar is characterized by being used for testing the detection capability of the ground penetrating radar on the thickness of a road surface and the detection capability of the ground penetrating radar on the defects of the road surface;
the testing device comprises a base provided with a testing groove body, and a simulation device for simulating a pavement structure and internal defect diseases is filled in the testing groove body;
the simulation device comprises a pavement surface layer, a pavement base layer, a sand filling body for simulating a roadbed and different disease body models for being placed in the sand filling body; the simulation device can place different disease body models in the sand filling body according to the test requirements to form different simulation devices; and the pavement surface layer, the pavement base layer and the test groove body are detachably assembled.
2. The device for testing a ground penetrating radar as claimed in claim 1, wherein said ground penetrating radar is a ground coupled radar or a space coupled radar;
the test tank body is characterized in that a sliding rail is arranged on the upper surface of the base on one side of the test tank body, a moving frame is mounted on the sliding rail, an extending end extending to the upper portion of the test tank body is arranged on the moving frame, and the extending end is used for mounting an air coupling antenna.
3. The device for testing a ground penetrating radar as claimed in claim 1, wherein one side of the test tank body is in the form of a openable plate, and a base surface of a lower portion of the openable plate is inclined downward to form a sand-discharging sliding surface.
4. The device for testing the ground penetrating radar as claimed in claim 1, wherein the pavement surface layer is 5-15 cm, the pavement base layer is 18-30 cm, and the sand filling body of the simulated roadbed is 1.5-2.0 m; the base is of a concrete structure.
5. The device for testing the ground penetrating radar as recited in claim 1, wherein the lesion model comprises a void model, a water-rich model and a loose model.
6. The device for testing a ground penetrating radar as claimed in any one of claims 1 to 5, wherein said device further comprises a radar wave velocity calibration device.
7. The device for testing the ground penetrating radar as claimed in claim 6, wherein the radar wave velocity calibration device comprises a pavement surface layer with a preset thickness and a steel plate at the bottom for calibration; the device also comprises a calibration steel plate, and the calibration steel plate is used for being placed at the bottom of a sand filling body of the simulation roadbed without the internal damaged body model during calibration.
8. A method for testing a ground penetrating radar, wherein the ground penetrating radar testing device of any one of claims 1 to 7 is used for testing the road surface thickness detection capability and the road surface defect detection capability of the ground penetrating radar, and the method comprises the following steps:
(1) calibrating the wave speed of the radar:
obtaining a first radar calibrationWave velocity V1The device is used for testing the detection capability of the pavement thickness;
obtaining a second radar calibration wave velocity V2The device is used for testing the detection capability of the pavement defects;
(2) and (3) testing the thickness of the ground penetrating radar road surface:
detecting a pavement surface layer of a specified sample by using a ground penetrating radar, and calibrating a wave speed V by using a first radar1And the two-way travel time t of the radar measured surface layer1' calculation of the actual measured thickness h of the pavement surface of the sample1’；
h1’＝V1 t1’/2
According to the measured thickness h1Comparing the actual thickness of the specified sample with the actual thickness of the specified sample to judge whether the pavement thickness detection capability is accurate or not;
(3) and (3) testing the defects of the ground penetrating radar road surface:
detecting a disease body model with specified type, burial depth and size by using a ground penetrating radar, and calibrating the wave velocity V by using a second radar2And the actual measurement of the radar with two travel time t2' calculation of actual measurement buried depth h of disease model2'; determining the type and the plane size of the lesion body according to the corresponding map characteristics of each lesion body in the specification;
h2’＝V2 t2’/2
according to the actual measurement of the buried depth h2' comparing the characteristic map and the plane size with corresponding parameters of an actual disease model, and judging whether the pavement defect detection capability is accurate.
9. The method for testing a ground penetrating radar according to claim 8, wherein in the step (1):
first radar calibration wave velocity V1The acquisition mode is as follows: selecting a pavement surface layer structure with preset thickness and a steel plate at the bottom for radar wave velocity calibration to obtain a first radar wave velocity V1；
Second radar calibration wave velocity V2The acquisition mode is as follows: additionally laying a steel plate at the bottom of the test tank body, and sequentially laying a sand filling structure, a pavement base structure and a pavement of a simulated roadbed without a disease body on the steel plateA face layer structure; calibrating the wave velocity of the radar to obtain a second radar wave velocity V2。
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| CN202110753562.3A CN113311506A (en) | 2021-07-02 | 2021-07-02 | Testing device and testing method for ground penetrating radar |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115220035A (en) * | 2022-09-20 | 2022-10-21 | 江苏筑升土木工程科技有限公司 | Road void detection system and detection method |
| CN116381821A (en) * | 2023-06-05 | 2023-07-04 | 中国科学院地质与地球物理研究所 | Device and method for indoor verification of detection resolution of ground penetrating radar on complex stratum |
| WO2023123568A1 (en) * | 2021-12-29 | 2023-07-06 | 中路交科科技股份有限公司 | Ground penetrating radar image artificial intelligence recognition method and device |
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2021
- 2021-07-02 CN CN202110753562.3A patent/CN113311506A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023123568A1 (en) * | 2021-12-29 | 2023-07-06 | 中路交科科技股份有限公司 | Ground penetrating radar image artificial intelligence recognition method and device |
| CN115220035A (en) * | 2022-09-20 | 2022-10-21 | 江苏筑升土木工程科技有限公司 | Road void detection system and detection method |
| CN116381821A (en) * | 2023-06-05 | 2023-07-04 | 中国科学院地质与地球物理研究所 | Device and method for indoor verification of detection resolution of ground penetrating radar on complex stratum |
| CN116381821B (en) * | 2023-06-05 | 2023-08-08 | 中国科学院地质与地球物理研究所 | Device and method for indoor verification of detection resolution of ground penetrating radar on complex stratum |
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