Studies on the reasonable liquefaction-prediction method of the 2011 Great East Japan Earthquake
Studies on the reasonable liquefaction-prediction method of the 2011 Great East Japan Earthquake
复制标题
2011年东日本大地震合理液化预测方法研究
DOI：
10.3208/jgs.9.169
复制
发表时间：
2014
期刊：
影响因子：
--
通讯作者：
T. Aoyagi
中科院分区：
文献类型：
--
作者：
K. Ishikawa;S. Yasuda;T. Aoyagi
通过反复扭剪试验，研究了长时间震动对液化发生的影响。对取自浦安市和丰浦砂的粉质砂进行了松散、中密和密实三种密度下的试验。对试件施加了两种类型的剪切波，i）20个周期的正弦波和ii）2011年东日本大地震在浦安K-NET的主震和余震期间记录的地震波。试验结果表明，长地震波对液化强度的影响大于日本道路协会的设计标准。此外，根据JRA标准的校正系数CW随着液化强度的增加而增加。根据试验结果，对东日本大地震中发生液化的高州小学的液化安全系数F L进行了估算。估算的F L值表明，地震液化再生砂的最大地表加速度并不大。
The authors conduct cyclic torsional shear tests to evaluate the effect of the long shaking on the occurrence of liquefaction. Silty sand taken from the boiled sand Urayasu City and Toyoura sand were tested under three densities, loose, medium dense and dense. Two types of shear wave were applied to specimen, i) sine wave of 20 cycles and ii) the seismic wave recorded during main shock and after shock of the 2011 Great East Japan Earthquake at Urayasu K-NET. Test results, showed that the influence of the long seismic wave on liquefaction strength was greater than the design standards shown to Japan Road Association. Moreover correction factor C W according to the JRA standard increased with liquefaction strength. Based on the test results, safety factor against liquefaction F L at Takasu Elementary School where liquefaction occurred during the Great East Japan Earthquake was estimated. The estimated F L showed that reclaimed sand liquefied by the earthquake thought the maximum surface acceleration was not large.