GPR surveys in enclosed underground sewer pipe space

Noshahri, Hengameh; Meijde, M. van der; Scholtenhuis, Léon Luc olde

doi:10.1016/j.tust.2022.104689

Cited by 10 publications

(7 citation statements)

References 15 publications

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“…This creates conditions for using GPR technology to detect the changes in the stratum caused pile construction and the differences in the changes in the strata media between different underground locations. Difference in the electromagnetic properties of underground media can cause changes in the GPR response, specifically manifested in changes in the waveform, amplitude, frequency, phase and related attributes of the GPR signals 40 , 42 , 49 , 50 , 54 , 55 . However, the propagation and response of electromagnetic wave fields under the condition of pile groups are very complex, and it is not easy to fully reveal the propagation laws of electromagnetic waves under such condition.…”

Section: Discussionmentioning

confidence: 99%

Quality evaluation of ground improvement by deep cement mixing piles via ground-penetrating radar

Li²,

Duan

et al. 2023

Nat Commun

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Deep cement mixing piles are a key technology for treating settlement distress of soft soil subgrade. However, it is very challenging to accurately evaluate the quality of pile construction due to the limitations of pile material, large number of piles and small pile spacing. Here, we propose the idea of transforming defect detection of piles into quality evaluation of ground improvement. Geological models of pile group reinforced subgrade are constructed and their ground-penetrating radar response characteristics are revealed. We have also developed ground-penetrating radar attribute analysis technology and established ground-penetrating radar technical system for evaluating the quality of ground improvement. We further prove that the ground-penetrating radar results integrating single-channel waveform, multi-channel section and attributes can effectively detect the defects and stratum structure after ground improvement. Our research results provide a rapid, efficient and economic technical solution for the quality evaluation of ground improvement in soft soil subgrade reinforcement engineering.

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Section: Discussionmentioning

confidence: 99%

Quality evaluation of ground improvement by deep cement mixing piles via ground-penetrating radar

Li²,

Duan

et al. 2023

Nat Commun

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“…In recent years, many scholars have conducted extensive research on ground penetrating radar (GPR) technology, a non-destructive, high-resolution electromagnetic (EM) technique that was primarily designed to investigate the subsurface detection of buried utility infra-structure, including pipes [8]. For example, detecting leaks in drainage pipes [9], cavity defects in the shallow subsurface [10], the enclosed underground sewerage pipe spaces [11], and early cracking of cement concrete pavements [12,13]. Techniques for detecting structural deterioration of water mains can determine their current condition, including their structural health, impact on water quality, and hydraulic capacity [4,14].…”

Section: Introductionmentioning

confidence: 99%

Design and Implementation of Three-Channel Drainage Pipeline Ground Penetrating Radar Device

Yang

Yan

2023

Sensors

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In order to solve the current problems that conventional video inspection can only detect, as an internal pipeline defect and drainage pipeline radar inspection device detects in a single direction and at radar frequency in water pipeline defect detection, a three-channel drainage pipeline ground penetrating radar (GPR) inspection device was designed and developed, the assembly and commissioning of the device prototype were completed, and an actual engineering test application was carried out. Focusing on the problem that the detection direction and depth of the single-channel detection device are limited, a three-channel drainage pipeline GPR inspection device is designed to realize the synchronous detection of the inside of the pipeline, the pipeline body, and the external environment of the pipeline, improving the detection depth and efficiency. According to the design scheme of the three-channel drainage pipeline GPR inspection device, the assembly of the device prototype was completed. The device contains three radar channels, the top of the main frequency of the antenna is 1.4 GHz, the two sides are 750 MHz, the video camera has a pixel count of 4 million, and the positioning accuracy is less than 1 mm, the waterproof grade is IP68, the detection accuracy of pipe deformation (slope) is 0.1°, the detection depth outside the pipe is 1.2 m, and the detection accuracy of corrosion thickness is 15 mm. In a practical application of the device, the Jianguomenqiao sewage pipeline in Beijing, China, was tested, resulting in the discovery of 87 defects, including 39 loose soil areas at the bottom of the pipe exterior, 40 void areas, and 8 cavities.

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“…Figure 5.1a shows sandy soil with a longitudinal cross-section of a sewer pipe and a void. To collect data, a GPR unit moves in a longitudinal direction with the concrete wall of the pipe [128]. The transmitter antenna (Tx) of the GPR unit emits electromagnetic (EM) waves through the concrete and sand.…”

Section: Gpr's Working Principlementioning

confidence: 99%

“…If voids are not identified and maintained timely, they can eventually grow into sinkholes. Appearance of sinkholes disturbs urban (underground and ground level) services and poses challenges to asset owners, managers, and residents [8,145].…”

Section: Introductionmentioning

confidence: 99%

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Dramatic voids and how to find them: In-pipe condition assessment of sewer pipes

Noshahri

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GPR surveys in enclosed underground sewer pipe space

Cited by 10 publications

References 15 publications

Quality evaluation of ground improvement by deep cement mixing piles via ground-penetrating radar

Quality evaluation of ground improvement by deep cement mixing piles via ground-penetrating radar

Design and Implementation of Three-Channel Drainage Pipeline Ground Penetrating Radar Device

Dramatic voids and how to find them: In-pipe condition assessment of sewer pipes

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