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Application example of 3D ground penetrating radar——Circle inspection of test field of Ministry of Communications
Release time: 2018-06-23

Basic situation of ring road

The ring road of the test field of the Ministry of Communications is runway-shaped, with a design speed of 60 km / h, a starting point of ZK0 + 000 ~ ZK2 + 038.77, a total length of 2039 meters, a subgrade width of 12 meters, and a circle with a radius of 130.5 meters on both sides curve.

The ring road is paved with 38 types of pavement structures, including asphalt pavement and cement pavement, and typical pavement structure types in various areas, such as long-life pavements, typical road structures in China's highways, full-thickness pavement structures, and high-speed typical pavement structures.

Distribution of pavement structure on full-scale ring road

3D GPR Detection

In March and May 2016, the 3D-RADAR three-dimensional ground penetrating radar detection equipment was used to detect the ring road surface structure of the test field of the Ministry of Communications. The 3D-Radar company's radar host: GeoScope MKIV and DX1821 air-coupled antenna array and DXG1820 ground-coupled antenna array.

Vehicle air-coupled antenna array (high-speed acquisition)

Trailer ground-coupled antenna array (low-speed acquisition)

Examples of test results

Collection route displayed on electronic map

1.Sensor

Station number: 0 + 325 --- 0 + 395

Air-coupled antenna longitudinal section

Magnified profile and horizontal slice plots show clear sensor shape

2.Cable

Radar longitudinal section (top) and horizontal slice (bottom) images of the cable at a depth of 40 cm

3. Layer thickness analysis

STR18 structure is 4cm SBS-SMA13 + 8cm A50-AC20 + 12cm A50-AC25 + 12cm AC25 + 12cm A50-AC25 + 4cm SBS-AC10 + 48cm graded gravel + soil base

Radar station number: 0 + 445 --- 0 + 505

Longitudinal section of air-coupled antenna test, each layer is obvious, the depth is 1.2 meters

4.Reinforced mesh inside concrete pavement

The picture shows the radar image of the reinforced mesh inside the concrete (the upper picture is the vertical section and the lower picture is the horizontal slice view), and the depth of the reinforced mesh is about 15cm. (Stand 0 + 129-152)

Station number 0 + 216-237m, radar image of reinforced mesh inside the road

Station number 0 + 237-257m, radar image of reinforced mesh inside the road

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