Wave Propagation in Heterogeneous Media.
Abstract
The propagation of stress wave due to a point type excitation in the form of a sinusoidal pulse in an infinite medium with inclusions having different properties is studied. The solution is carried out using the boundary element method in the frequency domain with a Discrete Fourier transform. The inclusion-medium interfaces are discretized using a constant element which assumes a uniform stress and displacement field over the element. Studies were conducted primarily with a two-dimensional plane strain model but some were also performed in the three-dimensional case, focusing on the attenuation characteristics and the velocity of the wave in terms of the arrival time for both the free field and the case with inclusions. Results are presented in the form of a dimensionless displacement and arrival times at the target under consideration. With a point excitation, as used in this study, the free field attenuation follows the geometrical damping law for both the two and the three-dimensional cases, except at distances in the neighborhood of one wavelength or closer, where a more complex pattern of waves is developed. Originator-supplied keywords: Wave propagation, Effect of Inclusions, Soil dynamics, Propagation velocities, Attenuation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1984
- Accession Number
- ADA150800
Entities
People
- C. Suddhiprakarn
Organizations
- University of Texas at Austin