The application of ground penetrating radar for mapping fractures in plutonic rocks within the Whiteshell Research Area, Pinawa, Manitoba, Canada

Stevens, Kevin M.; Lodha, G.S.; Holloway, A.L.; Soonawala, N. M.

doi:10.1016/0926-9851(95)90036-5

Cited by 42 publications

(5 citation statements)

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“…10a, downward arrow), the radar signals on the curve tails gradually diminish (Figs. 6c, 10a, dashed circles) due to a long EM-wave propagating distance causing more attenuation of signals (Stevens et al 1995). However, the signals on the tail of the HTT curve in Fig.…”

Section: Standing Waves In a Fractured Granitic Rock And A Deterioratmentioning

confidence: 87%

Analysis of Standing Waves on GPR Hyperbolic Travel-Time Responses - Case Studies in a Fractured Granitic Rock and a Deteriorating Coastal Structure

Chen¹,

Chow²,

Chen³

2007

Terr. Atmos. Ocean. Sci.

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ABSTRACT1 Institute of Applied Geoscience, National Taiwan Ocean University, Keelung, Taiwan, ROC 2 Institute of Geophysics, National Central University, Chung-Li, Taiwan, ROC * Corresponding author address: Prof. Joseph Jinder Chow, Institute of Applied Geoscience, National Taiwan Ocean University, Keelung, Taiwan, ROC; E-mail: jdchow@mail.ntou.edu.tw doi: 10.3319/ TAO.2007.18.5.879(T) Utilizing Ground Penetrating Radar (GPR), emitted electromagnetic (EM) standing waves can be generated in underground voids. This phenomenon can be employed for the detection of subterranean voids and fractures when one has a proper understanding of relation between the widest inner length in an underground vacant space and half an EM wavelength. In this study, indoor and outdoor small-scale experiments verified the generation of EM standing waves. These responses were then applied in an arched-top cave covered by a single layer of backfill at Gongzihliao, Taiwan. Further studies were carried out at two other sites, including a fracture located in a granite mountain without regolith on the surface at Kinmen, and a deteriorating fishing port in Nanfangao, northeast Taiwan. Applying a band-pass filter with bandwidth narrower than a typical two-octave bandwidth produced the required standing waves with recognizable positions of minimum amplitude. A hyperbolic travel-time (HTT) curve revealing the minimum amplitude, known as standing-wave nodes, indicates the presence of an underground hollow diffractor with the widest inner length in the vacant space being larger than half an EM wavelength. However, a HTT curve without nodal points signifies a hollow object with the widest inner length smaller than half an EM wavelength or an underground solid diffractor. An underground arched-top cave was detected by nodal points in the arc-like curves. When emitting the radar waves toward a wall, the Terr. Atmos. Ocean. Sci., Vol. 18, No. 5, December 2007 880 interval of the nodes was used for estimating the wavelength of receiving GPR signals. Identifying the occurrence of nodal points in HTT or HTTlike curves in radargrams may assist the GPR interpreting work for underground tunnels, drainages, cavities, fractures, or solid objects.

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Section: Standing Waves In a Fractured Granitic Rock And A Deterioratmentioning

confidence: 87%

Analysis of Standing Waves on GPR Hyperbolic Travel-Time Responses - Case Studies in a Fractured Granitic Rock and a Deteriorating Coastal Structure

Chen¹,

Chow²,

Chen³

2007

Terr. Atmos. Ocean. Sci.

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“…However, this is based on the anisotropic physical properties that the fracture set imposes on the rock mass, rather than mapping of individual fractures. GPR has mapped fractures within granites (Stevens et al, 1995) where there is a large reflection coefficient between the water filled fracture and the host rock. Dussauge-Peisser et al (2003) report mapping of fractures in a limestone cliff, although the fractures had been enlarged through dissolution.…”

Section: Investigations Of Chalkmentioning

confidence: 99%

The vehicle load simulation on the pavement structure and adjacent slopes basing on the geocoustic data observation

Koretskyi¹,

Onyshchenko²,

Ostroverkh³

et al. 2020

Dorogimosti

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“…The application of the geophysical method of GPR-Ground Penetrating Radar uses the principle of transmission of high frequency electromagnetic waves and their response to the existence of shallow subsurface geological structures and features [20,21]. This method is applied in hydrogeological and geotechnical studies for mapping fractures and faults [22][23][24][25][26][27][28], caves [29][30][31][32][33][34] and mineral research [35][36][37].…”

Section: Introductionmentioning

confidence: 99%

Mapping the integrity of rock mass with GPR: case study in decommissioning mining

Duz,

Moreira,

Casagrande

et al. 2023

SN Appl. Sci.

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Slopes are built for the purpose of extracting ore, in the case of mining, or access roads in civil works. The excavation of slopes in tropical countries is facilitated by the thick layer of soil formed from the more intense weathering when compared to other countries. However, the residence time of water in the soil is relatively longer and consequently allows the accumulation and percolation of water through rock fractures even in the dry period. These factors induce a greater probability of occurrence of ruptures. Mines in the decommissioning phase must guarantee slope stability conditions even after closure in order to comply with legislation and environmental safety. In this work, the slopes of a decommissioning mine were investigated using geophysical methods (GPR) and structural analysis of the rock mass. The results were presented in the form of radargrams that correlate distance and depth of investigation. Structural data served as the basis for the execution of kinematic analyzes for planar and wedge ruptures. The analysis of the results allowed the correlation between electromagnetic signal attenuation zones, with the presence of water and the occurrence of ruptures. Thus, the GPR results allowed the recognition of structural discontinuities, accumulation zones and water flow.

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The application of ground penetrating radar for mapping fractures in plutonic rocks within the Whiteshell Research Area, Pinawa, Manitoba, Canada

Cited by 42 publications

References 1 publication

Analysis of Standing Waves on GPR Hyperbolic Travel-Time Responses - Case Studies in a Fractured Granitic Rock and a Deteriorating Coastal Structure

Analysis of Standing Waves on GPR Hyperbolic Travel-Time Responses - Case Studies in a Fractured Granitic Rock and a Deteriorating Coastal Structure

The vehicle load simulation on the pavement structure and adjacent slopes basing on the geocoustic data observation

Mapping the integrity of rock mass with GPR: case study in decommissioning mining

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