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Seepage-induced acoustic emission in granular soils / Meng-Hsi Hung in Journal of geotechnical and geoenvironmental engineering, Vol. 135 N° 4 (Avril 2009) 

Public ISBD [article]  in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 4 (Avril 2009) . - pp. 566–572 Titre : Seepage-induced acoustic emission in granular soils Type de document : texte imprimé Auteurs : Meng-Hsi Hung, Auteur ; Gerald C. Lauchle, Auteur ; Mian C. Wang, Auteur Année de publication : 2009 Article en page(s) : pp. 566–572 Note générale : Geotechnical and geoenvironmental engineering Langues : Anglais (eng) Mots-clés : Acoustic  emission  Seepage  Granular  materials  Soils  Monitoring Résumé : This technical paper presents the results of a study on detecting excessive seepage in granular soils by monitoring the seepage-induced acoustic emission (AE). The laboratory experiments and data analyses were performed using specially designed data acquisition instruments and computer-based data analysis devices. The monitored data were analyzed using three methods, namely, amplitude, time, and frequency domain analyses. The analysis results showed that the seepage-induced AE in the test soils were broadband Gaussian signals which were zero mean, normally distributed, and leptokurtic. All of the measured autospectral density functions showed that the most prominent AE activities occurred within a frequency range of about 0.8–10kHz . Based on acoustic similarity laws and a graphical fitting method, the test results were subjected to dimensional analysis. The results of this analysis provided a relationship between a nondimensional sound pressure level and a nondimensional frequency, in which AE intensity, seepage velocity, soil, and permeant properties were interrelated. This relationship provided a fundamental basis for detecting excessive seepage using the monitored seepage-induced AE intensity. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A4%2856 [...] [article] Seepage-induced acoustic emission in granular soils [texte imprimé] / Meng-Hsi Hung, Auteur ; Gerald C. Lauchle, Auteur ; Mian C. Wang, Auteur . - 2009 . - pp. 566–572. Geotechnical and geoenvironmental engineering Langues : Anglais (eng) in Journal of geotechnical and geoenvironmental engineering > Vol. 135 N° 4 (Avril 2009) . - pp. 566–572 Mots-clés : Acoustic  emission  Seepage  Granular  materials  Soils  Monitoring Résumé : This technical paper presents the results of a study on detecting excessive seepage in granular soils by monitoring the seepage-induced acoustic emission (AE). The laboratory experiments and data analyses were performed using specially designed data acquisition instruments and computer-based data analysis devices. The monitored data were analyzed using three methods, namely, amplitude, time, and frequency domain analyses. The analysis results showed that the seepage-induced AE in the test soils were broadband Gaussian signals which were zero mean, normally distributed, and leptokurtic. All of the measured autospectral density functions showed that the most prominent AE activities occurred within a frequency range of about 0.8–10kHz . Based on acoustic similarity laws and a graphical fitting method, the test results were subjected to dimensional analysis. The results of this analysis provided a relationship between a nondimensional sound pressure level and a nondimensional frequency, in which AE intensity, seepage velocity, soil, and permeant properties were interrelated. This relationship provided a fundamental basis for detecting excessive seepage using the monitored seepage-induced AE intensity. En ligne : http://ascelibrary.org/doi/abs/10.1061/%28ASCE%291090-0241%282009%29135%3A4%2856 [...]