Geotechnical and seismic hazard study for a Type F site development

Abstract

This paper presents practical approaches for developing design response spectra in a liquefiable site and for evaluating liquefaction-induced ground settlement and lateral deformation for a site development consisting of four main structures, which are up to 12-story high over a two- to three-level parking structure in Marina Del Ray, CA, USA. The site encompasses approximately 6.5-acre (2.63-hectare) area bounded by two channels and is underlain by typical marine soils including soft clay and liquefiable sand. Extensive field exploration and laboratory testing were performed to investigate site-specific geotechnical conditions. After developing site-specific design ground motion parameters, liquefaction potential, liquefaction-induced settlements and lateral spreading were evaluated using the methodologies of the current state of practice. Several site retrofit measures to mitigate liquefaction-induced ground deformations were discussed and recommendations were made.

Keywords:

• liquefaction
• site response
• settlement
• lateral spreading
• probabilistic seismic hazard analysis

Acknowledgments

The work was performed while the author was employed by Kleinfelder, Inc. Mr Brian Crystal and other Kleinfelder staff are highly appreciated for their assistance in the field and laboratory investigations.