Identification of soil properties based on accelerometer records and comparison with other methods
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ORIGINAL PAPER
Identification of soil properties based on accelerometer records and comparison with other methods Hadi Mashhadban 1 & Ali Beitollahi 2 & Saman Soleimani Kutanaei 3
Received: 8 May 2015 / Accepted: 30 March 2016 # Saudi Society for Geosciences 2016
Abstract During an earthquake loading, the ground response parameters are significantly affected by the soil thickness, stiffness, type, and geological condition. There are various techniques for the determination of characteristics of soil which can be used for site effect assessment. Previewing past studies indicated that earthquake records provide a very applicable and useful tool to estimating the characteristics of soil. In this study, the system identification method based on particle swarm optimization algorithm was described. Then this technique is utilized to estimate the characteristics of soil profile of the Babol accelerograph station by using ground shaking data recorded during the recent Babol earthquakes of May 28, 2004 and January 11, 2012. Moreover, for determining the accuracy of the present technique, the obtained results were compared with the downhole test, microtremor measurement, and numerical site response modeling. The obtained results reveal that the present system identification method successfully estimated the soil properties.
Keywords System identification . Downhole test . Microtremor measurement . Site modeling
* Saman Soleimani Kutanaei [email protected] 1
Department of Civil Engineering, Saroyeh University, P.O. Box 404, Sari, Iran
2
Department of Engineering Seismology and Risk, Road, Housing and Urban Development Research Center (BHRC), P.O. Box 13145-1696, Tehran, Iran
3
Department of Civil Engineering, Babol University of Technology, P.O. Box 484, Babol, Iran
Introduction One of the most common important problems in geotechnical earthquake engineering is the evaluation of site effect on the characteristics of ground response. The 1985 Michoacan earthquake, 1989 earthquake of Kalamata, 1989 earthquake of Loma Prieta, 1990 earthquake of Rudbar-Manjil, 1999 earthquake of Chi-Chi, 2003 earthquake of Bam, and 2008 earthquake of Wenchuan were the well-known examples of site effects (Mittal et al. 2013; Kutanaei and Choobbasti 2015a). The seismic ground motion in any region is influenced by the soil type in that region. Usually, the younger softer soils amplify ground motion relative to the older, more competent soils or bedrock. Previous studies show that soft sediments result in amplification of earth movement, therefore damage caused by earthquake is more on these layers compared with hard layers; for these deposits, the phenomenon of resonance occurs commonly. The main reason for this phenomenon in soft deposits is entrapment on seismic waves due to the impedance difference between the deposits and the underlying bedrock (Hasancebi and Ulusay 2006; Bayat et al. 2015a, b). The interference between these trapped waves leads to resonance patterns, the amplitude and frequency of which are related to the ge
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