The use of the S-transform in Prazeres clay site

Volume 8, Issue 2, April 2023     |     PP. 81-98      |     PDF (3392 K)    |     Pub. Date: July 4, 2023
DOI: 10.54647/cebc560120    71 Downloads     77665 Views  

Author(s)

Jorge Machado de Carvalho, CERENA-FEUP, Department of Mining Engineering, Faculty of Engineering, University of Porto, Portugal
Mafalda Lopes Laranjo, PROMETHEUS, Instituto Politécnico de Viana do Castelo, Portugal

Abstract
In the framework of a research project led by the Faculty of Engineering - University of Porto (FEUP), an investigation and characterization campaign was carried out on a profile of the Lisbon Prazeres clay and limestone formation. The campaign comprised the use of in situ P and S-waves seismic cross-hole (CH) tests, using a borehole hammer and a sparker source, as well as mechanical tests such as SPT, PMT and SBPT. In addition, laboratory tests were carried out on undisturbed samples, using bender and ultrasonic transducers prior and during triaxial tests. The fact that two different in situ seismic sources were used allowed a comparative seismic signal analysis in time, frequency and time-frequency domains, using the Short Time Fourier Transform, STFT, and the S-Transform, ST. Following a summarized description of the developed work and obtained direct and indirect results, this paper addresses the analysis and comparison of the referred CH results using the STFT and ST approach.

Keywords
Prazeres Miocene clays, bender and ultrasonic transducers, seismic cross-hole, S-Transform

Cite this paper
Jorge Machado de Carvalho, Mafalda Lopes Laranjo, The use of the S-transform in Prazeres clay site , SCIREA Journal of Civil Engineering and Building Construction . Volume 8, Issue 2, April 2023 | PP. 81-98. 10.54647/cebc560120

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