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One of the mechanisms that contribute to settlements is due to soil lost as ejecta. To estimate ejecta-related settlement, one needs to estimate the volume of soils that will be expelled on the ground surface during a liquefaction event. This is an extremely challenging task as ejecta-related settlements is related to complex effects of temporal and spatial development of liquefaction, dissipation of excess pore water pressures through water flow, and development of cracks, fissures and cavities in the ground that create easy pathways for soil ejecta to reach the ground surface. The 2010-2011 Canterbury earthquake sequence provided a comprehensive database of well-documented liquefaction case histories from Christchurch with detailed observations and associated geotechnical testing. This study utilizes this database to develop a procedure for estimating settlement due to ejecta.
Collaborators:
Professor Misko Cubrinovski, University of Canterbury
Dr Nikolaos Ntritsos, Postdoctoral Research Fellow, University of Canterbury
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