Effect of Fill Material Density under Structures on Ground Motion Characteristics Due to Earthquake
Due to limited areas and excessive cost of land for projects, backfilling process has become necessary. Also, backfilling will be done to overcome the un-leveling depths or raising levels of site construction, especially near the sea region. Therefore, backfilling soil materials used under the foundation of structures should be investigated regarding its effect on ground motion characteristics, especially at regions subjected to earthquakes. In this research, 60-meter thickness of sandy fill material was used above a fixed 240-meter of natural clayey soil underlying by rock formation to predict the modified ground motion characteristics effect at the foundation level. Comparison between the effect of using three different situations of fill material compaction on the recorded earthquake is studied, i.e. peak ground acceleration, time history, and spectra acceleration values. The three different densities of the compacted fill material used in the study were very loose, medium dense and very dense sand deposits, respectively. Shake computer program was used to perform this study. Strong earthquake records, with Peak Ground Acceleration (PGA) of 0.35 g, were used in the analysis. It was found that, higher compaction of fill material thickness has a significant effect on eliminating the earthquake ground motion properties at surface layer of fill material, near foundation level. It is recommended to consider the fill material characteristics in the design of foundations subjected to seismic motions. Future studies should be analyzed for different fill and natural soil deposits for different seismic conditions.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1132313Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 449
 Dobry, R., and Vucetic, M., “Dynamic properties and seismic response of soft clay deposits,” Proceeding, International Symposium on Geotechnical Engineering of Soft Soils, Mexico City, Vol. 2, 2001, pp.51-87.
 Macky, T. A., “Earthquake effect on response of soil deposit,” Housing and Building Research Center, Egyptian Society for Soil Mechanics and Foundation Engng., 1992, Vol.7.
 Sandford, T. C. et al., “Soil-structure interaction of buried structures,” University of Maine, A2K04: Committee on Subsurface Soil Structure Interaction, 2004.
 Charles, K. and Pong, L. J., “Structural response amplification due to soft soil effect,” Department of civil Engng, University of Toronto, 2005.
 Soliman, K. Z., Farid, A. T., “Effect of clay deposit on ground motion characteristics and structure behavior,” HBRC journal, Egypt, Vol. 2, January 2006, pp. 96-105.
 School of Civil & Environmental Engng., “Ground motion amplification of soils in the Upper Mississippi embayment,” Georgia Institute of Technology, Press Web Site at http://www.ce.gatech.edu/, 2005.
 Zadoyan, P., “Site amplification effect at the Giumri industrial site, ”Nuclear and Radiation Safety Centre, civil Engineering, Ph.D. Dissertation, Press Web Site at http://www.aaspe.am/, 2000.
 Idriss, I. M., and Sun, G. I., “SHAKE91: A Computer program for conducting equivalent linear seismic response analyses of horizontally layered soil deposit,” University of California, Davis, California, 1992, pp13-18.
 Nawy, E. G., “SEISMOSIGNAL: A Computer program for earthquake characteristics,” Version 3.1.0, Press Web Site at http://www.seismosoft.com/, 2005.
 ProShake, User Manual “PROSHAKE: Ground response analysis program,” Version 1.1. EduPro Civil Systems, Inc., Redmond, Washington, 1996.
 Schnabel, P. B. and et al., “SHAKE: A Computer program for earthquake response analysis of horizontally layered sites,” University of California, EERC, Berkeley, California, 1972.
 Saxena, S. K., Avramidis, A. S., and Reddy, K. R., “Dynamic moduli and damping ratios for cemented sands at low strains,” Canadian Geotechnical Journal, 1988, Vol. 25.
 Seed, H. B. and Idriss, I. M., “Soil moduli and damping factors for dynamic response analysis,” University of California, EERC 70-10, Berkeley, California, 1970.
 Sun, J. I., Golesorchi, R., and Seed, B. H., “Dynamic moduli and damping ratios for cohesive soils,” University of California, Berkeley, EERC-88/15, 1988.