Abstract
This chapter discusses the features of the scattering of plane P-waves on gas-filled fractures located along with the motion of the incident wave front. This problem has practical significance in the areas of nondestructive testing and seismic exploration, primarily in the area of railway nondestructive testing. This type of fractures falls into the blind zone. In this chapter, such types of reflected waves are considered that can be registered, and, thus, the blind zone of the recording equipment can be avoided. Analytical expressions for reflected waves amplitudes and scattering angles are obtained. To obtain these expressions, the Wave Logica approach was used. This approach combines the advantages of the analytical study of wave fields and study of the computational solution of the elastic wave equation. Comparison of the analytical expressions with visualized wave fields (wave patterns) at the stage of derivation of these analytical expressions greatly facilitates the study that allows to avoid mistakes and also demonstrates the accuracy of the applied computational method. In this chapter, the grid-characteristic numerical method was used for the numerical solution of the elastic wave equation.
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The reported study was funded by RFBR according to the research Project No. 18-31-20063.
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Favorskaya, A.V. (2020). Elastic Wave Scattering on a Gas-Filled Fracture Perpendicular to Plane P-Wave Front. In: Jain, L., Favorskaya, M., Nikitin, I., Reviznikov, D. (eds) Advances in Theory and Practice of Computational Mechanics. Smart Innovation, Systems and Technologies, vol 173. Springer, Singapore. https://doi.org/10.1007/978-981-15-2600-8_16
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