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Site response assessment and ground conditions at King Saud University Campus, Riyadh City, Saudi Arabia

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Abstract

Site response characteristics have a significant influence on ground motion vibrations. To evaluate the site response effects at King Saud University campus, the horizontal-to-vertical spectral ratio (HVSR) technique has been applied at 45 sites with about 400-m spacing. The recording time was more than 1 h at each site with a sampling rate of 100 Hz. The data were processed and analyzed using Geopsy software to produce measurements of fundamental frequency and minimum site amplification factor. Moreover, shear-wave velocity down to 30-m depth has been acquired at 10 measuring sites in the campus. In addition, geotechnical borehole data were collected from four boreholes within the campus. Generally, in majority of sites the H/V curve for amplitude spectra displayed a clear peak, signifying the presence of a sharp soil–bedrock impedance contrast between alluvial deposits and underlying bedrock. It is indicated that the fundamental frequency ranges between 0.64 and 1.94 Hz. Given the measured resonance frequency of around 1 Hz, buildings located on the alluvium that have 5 stories in height could experience soil-structure resonance, while the amplification factor varies from 1.19 to 11.22 indicating localized zones having high vulnerability index due to the considerable thickness of alluvial deposits. Moreover, shear-wave velocity ranges between 320 m/s and 684 m/s revealing zones of stiff soil to very dense soil/or soft rock which is correlated well with the geotechnical parameters of borehole data. Based on these results, the ground conditions of near-surface sediments in the King Saud University campus indicate weak zones that led to ground subsidence resulting in differential settlements of foundations.

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Acknowledgments

Deep thanks are extended to the reviewers for their beneficial review and valuable comments.

Funding

The authors would like to extend their sincere appreciation to the Deanship of Scientific Research at King Saud University for its funding this research group No. RGP -1436-010.

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Correspondence to Sattam A. Almadani.

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Responsible Editor: Abdullah Al-Amri

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Almadani, S.A., Abdelrahman, K. & Mansour, F.I.b. Site response assessment and ground conditions at King Saud University Campus, Riyadh City, Saudi Arabia. Arab J Geosci 13, 357 (2020). https://doi.org/10.1007/s12517-020-05378-8

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  • DOI: https://doi.org/10.1007/s12517-020-05378-8

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