LIQUEFACTION-INDUCED COMPACTION AND SETTLEMENT OF SAND DURING EARTHQUAKES

概要

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By employing a dozen of irregular time histories of motions obtained during the recent major earthquakes, two series of simple shear tests, one in uni-directional and the other in multi-directional loading conditions, were carried out on saturated loose, medium dense and dense samples of Fuji river sand. Following the undrained application of irregular loads, the generated pore water pressures were made to dissipate and the volumetric strains measured. The amount of reconsolidation volumetric strains thus determined is regarded as representing the settlement characteristics of sand which takes place in-situ deposits following the liquefaction during earthquakes. The test results indicated that the magnitude of maximum shear strain induced during the irregular loading is uniquely correlated with the volumetric strains during the reconsolidation. The test results also indicated that if the sand is deformed largely during the irregular load application, the subsequent volumetric strains during the reconsolidation could amount to as much as about 4.O%, 2.5% and 1.2% for the sand sample prepared with relative densities of 47%, 73% and 93%, respectively.
社団法人地盤工学会の論文
1988-03-15