Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity

Subsurface characterization has always been an interesting issue in Geotechnical and geological engineering, especially when there is a potential risk of subsurface anomalies such as cavities and sinkholes. Due to the low resolution and accuracy of seismic recorded data at higher depths, anomalies i...

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Autores principales:	Hossein Rahnema, Sohrab Mirassi
Formato:	article
Lenguaje:	FA
Publicado:	Iranian Society of Structrual Engineering (ISSE) 2021
Materias:	cavity seismic source load frequency content rayleigh wave p-waves wave field Bridge engineering TG1-470 Building construction TH1-9745
Acceso en línea:	https://doaj.org/article/370b104595074571b4a2fa24174a13a6
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id	oai:doaj.org-article:370b104595074571b4a2fa24174a13a6
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spelling	oai:doaj.org-article:370b104595074571b4a2fa24174a13a62021-11-08T15:54:32ZEffect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity2476-39772538-261610.22065/jsce.2019.176403.1808https://doaj.org/article/370b104595074571b4a2fa24174a13a62021-04-01T00:00:00Zhttps://www.jsce.ir/article_88296_c66872e71650fc164736ae19bb129da6.pdfhttps://doaj.org/toc/2476-3977https://doaj.org/toc/2538-2616Subsurface characterization has always been an interesting issue in Geotechnical and geological engineering, especially when there is a potential risk of subsurface anomalies such as cavities and sinkholes. Due to the low resolution and accuracy of seismic recorded data at higher depths, anomalies identification has become more difficult. In this paper, the effect of various types of seismic source loads such as hammer impact, short-time impact, sinusoidal source and Ricker wavelet with a peak frequency of 100, 50 and 20 Hz is evaluated to identify the subsurface cavities by using the Finite Element Method in Abaqus 6.14 software. In addition, The ability of R and P waves are compared after the filtering the waves to detect cavities at different depths of 2, 6, 10 and 20 m. The results show that the frequency content and peak frequency of source load have a significant effect on the penetration depth and wave field resolution. Furthermore, filtering methods and separating R and P waves could be more helpful to identify the shallow and high depths cavities. Also, Ricker seismic source with a central frequency of 100 Hz, hammer impact and short-time impact indicate suitable results for cavities located at depths of 2, 6 and 10 meters. Whereas, it is difficult to identify the backscattered R waves from the cavity at the depth of 20 meters. However, low-frequency seismic load, such as 20 Hz Ricker source load, provides backscattered R and P waves from the cavity at the depth of 20 m. In general, the acceptable results can be obtained by using a combination of P and R waves and applying seismic load proportional to the depth of identification.Hossein RahnemaSohrab MirassiIranian Society of Structrual Engineering (ISSE)articlecavityseismic source loadfrequency contentrayleigh wavep-waveswave fieldBridge engineeringTG1-470Building constructionTH1-9745FAJournal of Structural and Construction Engineering, Vol 8, Iss 2, Pp 280-300 (2021)
institution	DOAJ
collection	DOAJ
language	FA
topic	cavity seismic source load frequency content rayleigh wave p-waves wave field Bridge engineering TG1-470 Building construction TH1-9745
spellingShingle	cavity seismic source load frequency content rayleigh wave p-waves wave field Bridge engineering TG1-470 Building construction TH1-9745 Hossein Rahnema Sohrab Mirassi Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity
description	Subsurface characterization has always been an interesting issue in Geotechnical and geological engineering, especially when there is a potential risk of subsurface anomalies such as cavities and sinkholes. Due to the low resolution and accuracy of seismic recorded data at higher depths, anomalies identification has become more difficult. In this paper, the effect of various types of seismic source loads such as hammer impact, short-time impact, sinusoidal source and Ricker wavelet with a peak frequency of 100, 50 and 20 Hz is evaluated to identify the subsurface cavities by using the Finite Element Method in Abaqus 6.14 software. In addition, The ability of R and P waves are compared after the filtering the waves to detect cavities at different depths of 2, 6, 10 and 20 m. The results show that the frequency content and peak frequency of source load have a significant effect on the penetration depth and wave field resolution. Furthermore, filtering methods and separating R and P waves could be more helpful to identify the shallow and high depths cavities. Also, Ricker seismic source with a central frequency of 100 Hz, hammer impact and short-time impact indicate suitable results for cavities located at depths of 2, 6 and 10 meters. Whereas, it is difficult to identify the backscattered R waves from the cavity at the depth of 20 meters. However, low-frequency seismic load, such as 20 Hz Ricker source load, provides backscattered R and P waves from the cavity at the depth of 20 m. In general, the acceptable results can be obtained by using a combination of P and R waves and applying seismic load proportional to the depth of identification.
format	article
author	Hossein Rahnema Sohrab Mirassi
author_facet	Hossein Rahnema Sohrab Mirassi
author_sort	Hossein Rahnema
title	Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity
title_short	Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity
title_full	Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity
title_fullStr	Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity
title_full_unstemmed	Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity
title_sort	effect of frequency content of seismic source load on rayleigh and p waves in soil media with cavity
publisher	Iranian Society of Structrual Engineering (ISSE)
publishDate	2021
url	https://doaj.org/article/370b104595074571b4a2fa24174a13a6
work_keys_str_mv	AT hosseinrahnema effectoffrequencycontentofseismicsourceloadonrayleighandpwavesinsoilmediawithcavity AT sohrabmirassi effectoffrequencycontentofseismicsourceloadonrayleighandpwavesinsoilmediawithcavity
_version_	1718441557395243008

Effect of frequency content of seismic source load on Rayleigh and P waves in soil media with cavity

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