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Volume 14 Number 6
  • ISSN: 1569-4445
  • E-ISSN: 1873-0604

Abstract

ABSTRACT

Acoustic emission (AE) testing is regarded as an effective non‐destructive technique and is capable of detecting micro‐level defects inside a material. In the field of civil engineering, the acoustic emission technique has been widely applied to the studies of steelwork, concrete, and composite materials. However, the geophysical investigations of the application of acoustic emission, dealing with porous granular media, are comparatively limited. In this study, the acoustic emission testing is implemented in a model pile system to investigate subsoil behaviour subjected to pile penetration. The results reveal that the tendency of acoustic emission settlement and load settlement shows high similarity. In addition, the detected acoustic emission signals are studied in the frequency domain using fast Fourier transformation. Higher frequency acoustic emission signals (>100 kHz) are interpreted to be associated with sand particle crushing, which provides a new insight to evaluate the feature of sand grain crushing. Furthermore, the distinction of acoustic emission characteristics observed among different pile penetration sequences demonstrates the effect of ground density on the subsoil behaviour. The results obtained in this paper are beneficial to further clarify the bearing mechanism of pile foundations and also to provide useful information on the fundamental characteristics of acoustic emission signals originating from stressed granular soils, that can be extended to other acoustic emission‐based field investigations.

© European Association of Geoscientists and Engineers © 2016 European Association of Geoscientists and Engineers
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/content/journals/10.3997/1873-0604.2016038
2016-10-01
2024-04-26

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Behaviour and frequency characteristics of acoustic emissions from sandy ground under model pile penetration
Near Surface Geophysics 14, 515 (2016); https://doi.org/10.3997/1873-0604.2016038
/content/journals/10.3997/1873-0604.2016038
/content/journals/10.3997/1873-0604.2016038
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  • Article Type: Research Article

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