SHAKE TABLE TEST ON LIQUEFIED GROUND AROUND UNDERGROUND STRUCTURE FOR STRAIN HISTORY AND SUBSIDENCE OF GROUNDSURFACE

Abstract

 Local subsidence damage on the airport taxiway right over the ground nearby the underground structure occurred during the 2011 off the Pacific coast of Tohoku Earthquake. Shake table test of a large model in 1g gravitational field was conducted to make clear a mechanism of this subsidence damage. This study focuses on relationship between strain history and subsidence of ground surface in the liquefied ground. As result, the maximum strain and accumulated strain of deviator shear strain around underground structure increased in comparison to other places where far away from the underground structure. Then when subsidence of ground surface increased, distribution of subsidence corresponded to distribution of the maximum strain and accumulated strain in the ground.