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2011年新西兰Mw6.3地震液化及岩土震害述评

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Keywords: 新西兰地震,场地液化,地震灾害,Christchurch地震

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Abstract:

2010-2011年间新西兰南岛Christchurch地区发生了一系列破坏性地震,造成了Christchurch地区大面积的砂土液化,其中以2011年2月22日ChristchurchMw6.3地震场地液化和侧移最为严重,导致了约15000栋居民住宅、1000栋商业用房及桥梁、堤坝、地下生命线设施的严重破坏。该次地震是有液化调查历史以来的大地震中第一个以液化为震害主因的一次地震,且场地出现了大量的10~20m深层土液化。场地液化引起的建筑物破坏,主要包括建筑物震陷及不均匀震陷。液化侧移主要发生在近河流区域,分为分布式和滑移块式。新西兰地震中场地液化对建筑物的破坏突显了规范中抗液化设计及抗液化措施研究的不足,对于可液化场地设计反应谱及建筑物抗震技术的研究亟需进行深入探讨。

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