2011年日本东北地区太平洋近海地震地基液化灾害综述
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摘要
2011年3月11日,日本太平洋东海岸发生Mw9.0级大地震,并引发巨大海啸,导致了日本东北和关东地区大面积的地基液化震害。通过现场震害调查和最新资料分析,首先较为系统地介绍了日本地震受灾区的液化宏观现象和典型震害特征。其次,研究了余震再液化和地震-海啸耦合灾害的破坏机制和特征,指出余震再液化受地震力大小、应力历史及超孔隙水压力消散程度的影响,并将地震和海啸耦合破坏过程分为3个阶段:震后液化阶段、间歇期恢复阶段、海啸流滑破坏阶段;最后,对此次强震中有关抗液化地基处理方法的有效性进行了分析与探讨,以期为今后的地基抗液化设计提供参考与借鉴。
On March 11th,2011,an earthquake with magnitude of Mw 9.0 occurred off the Pacific Coast of Tohoku,and triggered widespread liquefaction in Tohoku and Kanto regions of Japan.Based on the field investigation and data analysis,the characteristics of liquefaction,liquefaction-induced damages,different failure mechanisms,characteristics of re-liquefaction in the aftershocks and seismic tsunami hazards are presented.The study also shows that re-liquefaction resistance is greatly affected by the intensity of earthquakes,stress history and dissipation of excess pore-water pressure.The damage process due to the seismic tsunami hazards is divided into three stages,the post-earthquake liquefaction stage,the recovery stage of soil strength and the flow-sliding failure stage.Finally,the effectiveness of ground improvement methods(sand compaction pile and sand drain method) in this massive earthquake is summarized for liquefaction mitigation in the future.
引文
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