Post-mortem analysis of the embankment failure at Makinohara of Tomei Expressway induced by Surugawan Earthquake (Aug. 2009)

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Comparing the laboratory test data with the in-situ dry density and moisture content, it was concluded that constant volume shear strength of the fill which did not fail during the Surugawan earthquake (Aug. 2009) was about 1,200kPa while the strength of the fill which failed during the earthquake was estimated to be about 120kPa based on the back-calculation. The possible mechanism of this reduction of the shear strength of the fill material, at Makigahara, Tomei Expressway, caused by a long-term infiltration of the water was quantitatively clarified by the overall observation at the site together with a series of laboratory tests on the fill material.