Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

Abstract

A series of simple impact tests is performed, both on clay and on peat, in order to compare the current wave theory with the obtained data. The waves at the surface are measured with three 3D geophones. With this the wave propagation and the energy dissipation in three directions has been studied both for clay and peat. Since the impact produces a group of waves, only the first arrival time can easily be detected. By transferring the wave information into a 3D energy flow, also the average arrival time and the end-of-wave arrival time can be determined. The results of all tests are very similar, the short wave group splits up in three phases: the first phase consists of compression waves, in the second phase the Rayleigh waves dominate and in the last phase, remarkably, a kind of diagonal Love waves dominate. The second phase starts with a sudden flip of the particle motion due to the arrival of the second wave. In clay 78% of the energy is found in the second phase, while in peat 72% of the energy is found in the third phase.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

Near Field Wave Transformation in Clay and Peat

San Diego, California

A series of simple impact tests is performed, both on clay and on peat, in order to compare the current wave theory with the obtained data. The waves at the surface are measured with three 3D geophones. With this the wave propagation and the energy dissipation in three directions has been studied both for clay and peat. Since the impact produces a group of waves, only the first arrival time can easily be detected. By transferring the wave information into a 3D energy flow, also the average arrival time and the end-of-wave arrival time can be determined. The results of all tests are very similar, the short wave group splits up in three phases: the first phase consists of compression waves, in the second phase the Rayleigh waves dominate and in the last phase, remarkably, a kind of diagonal Love waves dominate. The second phase starts with a sudden flip of the particle motion due to the arrival of the second wave. In clay 78% of the energy is found in the second phase, while in peat 72% of the energy is found in the third phase.