Integrated GPR and ERT data interpretation for bedrock identification at Cléricy, Québec, Canada

Diallo, Mamadou Cherif; Cheng, Li Zhen; Rosa, Éric; Gunther, Christiaan; Chouteau, Michel

doi:10.1016/j.enggeo.2018.09.011

Cited by 31 publications

(20 citation statements)

References 32 publications

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“…These geological features could affect the stability of the road. Moreover, the data accuracy in the data interpretation depends on the precision in GPR wave velocity estimation [224], being a complex task in heterogeneous media. The studies presented in [224] propose the 450 MHz ground-coupled antenna as the most appropriate system, because it offers higher resolution than antennas between 100 MHz to 200 MHz central frequency.…”

Section: Soil Subgrade Assessment and The Detection Of Bedrockmentioning

confidence: 99%

“…Moreover, the data accuracy in the data interpretation depends on the precision in GPR wave velocity estimation [224], being a complex task in heterogeneous media. The studies presented in [224] propose the 450 MHz ground-coupled antenna as the most appropriate system, because it offers higher resolution than antennas between 100 MHz to 200 MHz central frequency. This result is a consequence of the GPR wave attenuation, allowing for the detection of discontinuities until a maximum depth of 5 m in all cases, based on the observation of different textures in the B-scans.…”

Section: Soil Subgrade Assessment and The Detection Of Bedrockmentioning

confidence: 99%

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A Review of GPR Application on Transport Infrastructures: Troubleshooting and Best Practices

2021

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The non-destructive testing and diagnosis of transport infrastructures is essential because of the need to protect these facilities for mobility, and for economic and social development. The effective and timely assessment of structural health conditions becomes crucial in order to assure the safety of the transportation system and time saver protocols, as well as to reduce excessive repair and maintenance costs. Ground penetrating radar (GPR) is one of the most recommended non-destructive methods for routine subsurface inspections. This paper focuses on the on-site use of GPR applied to transport infrastructures, namely pavements, railways, retaining walls, bridges and tunnels. The methodologies, advantages and disadvantages, along with up-to-date research results on GPR in infrastructure inspection are presented herein. Hence, through the review of the published literature, the potential of using GPR is demonstrated, while the main limitations of the method are discussed and some practical recommendations are made.

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Section: Soil Subgrade Assessment and The Detection Of Bedrockmentioning

confidence: 99%

Section: Soil Subgrade Assessment and The Detection Of Bedrockmentioning

confidence: 99%

A Review of GPR Application on Transport Infrastructures: Troubleshooting and Best Practices

2021

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“…The joint use of GPR and ERT can be effective for an enhanced characterization of geological features in karst (Elawadi et al, 2006;El-Qady et al, 2005). The combination of GPR and ERT surveys has been used to identify bedrock (Diallo et al, 2019), and gypsum deposits in urban areas (Gołębiowski & Jarosińska, 2019), and geological structure of karst unsaturated zone (Carrière et al, 2013), and to assess the risk of subsidence of a sinkhole collapse (Gómez-Ortiz & Martín-Crespo, 2012). Most of these studies show that the GPR method has advantages in the imaging of vertical and inclined fractures near the surface, and that the ERT method has advantages in delineating horizontal structures.…”

Section: Core Ideasmentioning

confidence: 99%

“…The most important physical properties of the materials for GPR and resistivity data interpretation are the relative dielectric permittivity (or dielectric constant) and the electrical resistivity, respectively (Diallo et al, 2019). Table 1 shows examples of these properties for some common materials from the investigation of the other sites.…”

Section: Physical Properties Of Materialsmentioning

confidence: 99%

Evaluating the joint use of GPR and ERT on mapping shallow subsurface features of karst critical zone in southwest China

Tao

Chen

Cheng

et al. 2021

Vadose Zone Journal

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The soils and underlying weathered carbonate rock in karstic regions play an important role in the infiltration, storage, and retention of water and nutrients. Because of significant heterogeneity of the karst, the use of individual geophysical techniques is often not sufficient for unambiguous assessment of the irregular distributions of soils and underlying fractures. In this study, ground penetrating radar (GPR) and electrical resistivity tomography (ERT) are jointly used with additional observations to delineate the shallow subsurface structure in two exposed profiles. The results show that ERT is effective for detecting the soil-rock interfaces, even for irregular terrain and fracture structures, such as a funnel-shaped doline, as the soils and rocks show a large resistivity contrast. Although ERT may be able to sense the presence of extensive fracturing, it cannot detect individual small aperture fractures. Joint use of different frequencies of the GPR antenna (e.g., 100 and 500 MHz in this study) allowed the detection of most fractures at different depths in the study sites. However, forward modeling of typical weathered rock features illustrates that the GPR data cannot resolve any reflection signals of the vertical fractures, so the features of vertically enlarged fractures filled by soils cannot be seen from the GPR images.Moreover, large uncertainties of resistivity at the interface between soils or fractures and bedrock limit the identification of an irregularly distributed subsurface structure. Despite the limitations of individual techniques, the combination of ERT and GPR enhances the delineation of the soil-bedrock interface and identification of the fracture network, which can allow an enhanced geological interpretation of shallow subsurface features in the karst areas. INTRODUCTIONKarst is an important landscape, which covers about 15% of the world's land area or about 2.2 million km 2 (Yuan & Cai, 1988). Twenty-five percent of the global population fully

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“…[34][35][36]. Therefore, GPR is widely used in geotechnical engineering, environmental protection, archeological site detection, geological research, underground pipeline detection, detection of urban public facilities, and military detection [37][38][39][40][41][42][43][44][45][46]. Based on this, GPR has more advantages in continuous long-distance highway engineering detection.…”

Section: Introductionmentioning

confidence: 99%

Damage Properties of the Block-Stone Embankment in the Qinghai–Tibet Highway Using Ground-Penetrating Radar Imagery

Chen

et al. 2022

Remote Sensing

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The block-stone embankment is a special type of embankment widely used to protect the stability of the underlying warm and ice-rich permafrost. Under the influence of multiple factors, certain damages will still occur in the block-stone embankment after a period of operation, which may weaken or destroy its cooling function, introducing more serious damages to the Qinghai–Tibet Highway (QTH). Ground-penetrating radar (GPR), a nondestructive testing technique, was adopted to investigate the damage properties of the damaged block-stone embankment. GPR imagery, together with the other data and methods (structural characteristics, field survey data, GPR parameters, etc.), indicated four categories of damage: (i) loosening of the upper sand-gravel layer; (ii) loosening of the block-stone layer; (iii) settlement of the block-stone layer; and (iv) dense filling of the block-stones layer. The first two conditions were widely distributed, whereas the settlement and dense filling of the block-stone layer were less so, and the other combined damages also occurred frequently. The close correlation between the different damages indicated a causal relationship. A preliminary discussion of these observations about the influences on the formation of the damage of the block-stone embankment is included. The findings provide some points of reference for the future construction and maintenance of block-stone embankments in permafrost regions.

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Integrated GPR and ERT data interpretation for bedrock identification at Cléricy, Québec, Canada

Cited by 31 publications

References 32 publications

A Review of GPR Application on Transport Infrastructures: Troubleshooting and Best Practices

A Review of GPR Application on Transport Infrastructures: Troubleshooting and Best Practices

Evaluating the joint use of GPR and ERT on mapping shallow subsurface features of karst critical zone in southwest China

Damage Properties of the Block-Stone Embankment in the Qinghai–Tibet Highway Using Ground-Penetrating Radar Imagery

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