EVALUATION OF VOLUMETRIC STRAIN IN LIQUEFIED GROUND AROUND UNDERGROUND STRUCTURE BY USING SHEAR STRAIN HISTORIES

Abstract

 Local subsidence damage on the airport taxiway right over the ground nearby the underground structure occurred at Sendai airport during the 2011 off the Pacific coast of Tohoku Earthquake. Shake table tests of the 1g gravitational field were performed to make clear a mechanism of the subsidence damage. This study focuses on evaluation of volumetric strain of liquefied ground around the underground structure by using shear strain histories obtained by the shake table tests and correlation between experimental results and estimated values of subsidence of ground surface. As a result, local subsidence around underground structure could be evaluated by shear strain histories and subsidence estimated by using the accumulated shear strain was higher estimation accuracy against experimental results than by using the maximum shear strain.