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Effect of wave-inclusion interactions in the crosshole tomographic imaging of heterogeneous media
Abstract This paper describes a series of physical and numerical experiments designed to evaluate elastic wave-inclusion interactions and the ability of crosshole travel-time tomography to detect anomalies in heterogeneous media. The effects of diffraction-driven time delays on wave propagation detection methodologies are considered using a simple circular Plexiglas plate with a carved slot. Then, the quality of the tomographic inversion for different wavelengths to ray-path lengths and anomaly size ratios are tested using a rectangular Plexiglas plate containing a circular cavity. Guidelines for establishing the proper measurement configuration are developed based on the observed wave-inclusion interactions. Finally, numerical simulations are performed to extend the proposed guidelines for stress-dependent field applications. The simulated results show that crosshole travel-time tomography, with a measurement configuration (e.g., choice of wavelength and ray-path length) considering diffraction phenomena, can detect the size of an anomaly in a stress-dependent heterogeneous medium with a 10% error.
Effect of wave-inclusion interactions in the crosshole tomographic imaging of heterogeneous media
Abstract This paper describes a series of physical and numerical experiments designed to evaluate elastic wave-inclusion interactions and the ability of crosshole travel-time tomography to detect anomalies in heterogeneous media. The effects of diffraction-driven time delays on wave propagation detection methodologies are considered using a simple circular Plexiglas plate with a carved slot. Then, the quality of the tomographic inversion for different wavelengths to ray-path lengths and anomaly size ratios are tested using a rectangular Plexiglas plate containing a circular cavity. Guidelines for establishing the proper measurement configuration are developed based on the observed wave-inclusion interactions. Finally, numerical simulations are performed to extend the proposed guidelines for stress-dependent field applications. The simulated results show that crosshole travel-time tomography, with a measurement configuration (e.g., choice of wavelength and ray-path length) considering diffraction phenomena, can detect the size of an anomaly in a stress-dependent heterogeneous medium with a 10% error.
Effect of wave-inclusion interactions in the crosshole tomographic imaging of heterogeneous media
Kim, Kyu-Sun (Autor:in) / Fratta, Dante (Autor:in)
KSCE Journal of Civil Engineering ; 22 ; 482-493
05.05.2017
12 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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