Application of BGPR Logging: Two Case Studies

Yang, Chia‐Ning; Wang, Tzu-Bin; Liu, Hsing-Chang

doi:10.1061/(asce)gt.1943-5606.0000266

Cited by 2 publications

(1 citation statement)

References 15 publications

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“…As a non-destructive investigation method, ground-penetrating radar (GPR) is regarded as a powerful complement to traditional drilling-based methods [8], especially for shallow earth and rock stratigraphic interfaces [9][10][11][12]. The GPR technique has been successfully used in inspecting caverns under roadway pavements, locating pipes underground, and reinforcing bars in piles [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Identification of Complex Slope Subsurface Strata Using Ground-Penetrating Radar

Wang,

Zhang,

et al. 2024

Remote Sensing

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Identification of slope subsurface strata for natural soil slopes is essential to assess the stability of potential landslides. The highly variable strata in a slope are hard to characterize by traditional boreholes at limited locations. Ground-penetrating radar (GPR) is a non-destructive method that is capable of capturing continuous subsurface information. However, the accuracy of subsurface identification using GPRs is still an open issue. This work systematically investigates the capability of the GPR technique to identify different strata via both laboratory experiments and on-site examination. Six large-scale models were constructed with various stratigraphic interfaces (i.e., sand–rock, clay–rock, clay–sand, interbedded clay, water table, and V–shaped sand–rock). The continuous interfaces of the strata in these models were obtained using a GPR, and the depths at different points of the interfaces were interpreted. The interpreted depths along the interface were compared with the measured values to quantify the interpretation accuracy. Results show that the depths of interfaces should be interpreted with the relative permittivity, back-calculated using on-site borehole information instead of empirical values. The relative errors of the depth of horizontal interfaces of different strata range within ±5%. The relative and absolute errors of the V–shaped sand–rock interface depths are in the ranges of [−9.9%, 10.5%] and [−107, 119] mm, respectively. Finally, the GPR technique was used in the field to identify the strata of a slope from Tanglang Mountain in China. The continuous profile of the subsurface strata was successfully identified with a relative error within ±5%.

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Section: Introductionmentioning

confidence: 99%

Identification of Complex Slope Subsurface Strata Using Ground-Penetrating Radar

Wang,

Zhang,

et al. 2024

Remote Sensing

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Dual polarized triple band hybrid MIMO cylindrical dielectric resonator antenna for LTE2500/WLAN/WiMAX applications

Sharma

Das

Gangwar

2016

Int J RF and Microwave Comp Aid Eng

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In this communication, triple band hybrid multi-input-multi-output (MIMO) cylindrical dielectric resonator antenna (CDRA) with high isolation is examined. The proposed MIMO antenna includes two symmetric folded microstrip line feeding structures along with CDRA at two different ends of substrate. Two inverted L-shaped strips on the ground plane are used to enhance the isolation (S 12 < 215 dB) as well as to generates 2.7 GHz frequency band. Metallic strip on the ground plane act as an electromagnetic reflector and also enhance the isolation between two antennas (S 12 < 220 dB). Archetype of proposed MIMO antenna design has been fabricated and tested to validate the simulated results. The proposed antenna operates at three different frequency bands 2.24-2.38 GHz, 2.5-3.26 GHz, and 4.88-7.0 GHz (S 11 < 26 dB) with the fractional bandwidth 6.06%, 26.4%, and 35.7%, respectively. Folded microstrip lines generate k 4 path delay between the electric field lines and originate circular polarization characteristics in the frequency range 5.55-5.75 GHz with the fractional bandwidth of 3.55%. In order to satisfy the different performance requirement of MIMO antenna such as envelop correlation coefficient, mean effective gain, effective diversity gain, peak gain are also examined. The proposed antenna is found suitable for LTE2500, WLAN, and WiMAX applications. V C 2016 Wiley Periodicals, Inc. Int J RF and Microwave CAE 26:763-772, 2016.

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Application of BGPR Logging: Two Case Studies

Cited by 2 publications

References 15 publications

Identification of Complex Slope Subsurface Strata Using Ground-Penetrating Radar

Identification of Complex Slope Subsurface Strata Using Ground-Penetrating Radar

Dual polarized triple band hybrid MIMO cylindrical dielectric resonator antenna for LTE2500/WLAN/WiMAX applications

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