Liquefaction-Induced Compaction and Settlement of Sand During Earthquakes
Liquefaction-Induced Compaction and Settlement of Sand During Earthquakes
复制标题
地震期间液化引起的沙子压实和沉降
DOI：
10.3208/sandf1972.28.65
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发表时间：
1988
影响因子：
3.7
通讯作者：
K. Ishihara
中科院分区：
文献类型：
--
作者：
H. Nagase;K. Ishihara
利用近期几次大地震中获得的十几个不规则的运动时程，对饱和松散、中密和致密的富士河砂样进行了单向和多向加载条件下的两组简单剪切试验。在不排水的情况下施加不规则荷载，使产生的孔压消散，并测量体积应变。由此确定的再固结体应变量被认为代表了地震液化后原地沉积的砂土的沉降特征。试验结果表明，在非规则加载过程中产生的最大剪应变的大小与再固结过程中的体积应变唯一相关。试验结果还表明，对于相对密度为47%、73%和93%的砂样，如果砂土在非规则加载过程中发生较大变形，其再固结过程中的后续体积应变可能分别高达4.0%、2.5%和1.2%左右。
ABSTRACT 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 4.0%, 2.5% and 1.2% for the sand sample prepared with relative densities of 47%, 73% and 93%, respectively.