Interaction of caisson foundations with a seismically rupturing normal fault: centrifuge testing versus numerical simulation

Dramatic failures have occurred in recent earthquakes as a result of the interplay of surface structures with outcropping fault ruptures, highlighting the need to account for fault-induced loading in seismic design. Current research into the mechanisms of fault rupture–foundation–structure interaction has revealed a potentially favourable role of caissons in comparison with other foundation types. This paper explores the mechanisms of normal fault rupture interaction with rigid caisson foundations, with an integrated approach using both experiments and analysis. A series of centrifuge model tests were first conducted to study the response of a square (in plan) caisson foundation of dimensions 5 m × 5 m × 10 m, founded on a 15 m thick layer of dry dense sand. A non-linear three-dimensional numerical simulation of the problem was then developed, and adequately validated against centrifuge test results. Depending on its position relative to the fault, the caisson interacts with the fault rupture, sometimes m...

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