Liquefaction in the Kanto region during the 2011 off the pacific coast of Tohoku earthquake
Liquefaction in the Kanto region during the 2011 off the pacific coast of Tohoku earthquake
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2011年东北太平洋沿岸地震期间关东地区的液化
DOI：
10.1016/j.sandf.2014.06.016
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发表时间：
2014
影响因子：
3.7
通讯作者：
Toshihiko Hayashida
中科院分区：
文献类型：
--
作者：
I. Towhata;S. Maruyama;K. Kasuda;J. Koseki;K. Wakamatsu;H. Kiku;T. Kiyota;S. Yasuda;Yuichi Taguchi;Shogo Aoyama;Toshihiko Hayashida
本文是对2011年日本东北部太平洋沿岸地震时关东地区发生的液化事件的总结，不包括在其他地方讨论的东京湾地区的事件。大多数液化发生在废弃的河道和以前的湖泊中，这些湖泊最近被可液化的土壤填满。值得注意的是，私人住宅用地和河堤受到破坏，这些土地和河堤没有得到很好的处理，以防止液化风险。许多遗址在1923年或1987年的地震后经历了反复的液化，如果它们在那个时候存在的话。与最近的易液化土壤相反，由于所谓的“老化”效应，更老的砂几乎不液化。本研究分析了东京地区的情况下，定量评估老化的时间发展，以便在更古老的土壤液化风险可能会合理评估。在附录中，对航片法在液化场地快速探测中的可靠性作了评述。
The present text is a summary of liquefaction events that occurred in the Kanto Region during the 2011 off the Pacific coast of Tohoku Earthquake, excluding those events in the Tokyo Bay area that are discussed elsewhere. Most liquefaction occurred in the abandoned river channels and former lakes that had been recently filled with liquefiable soils. Noteworthy was the damage to private housing lands and river dikes that had not been well treated against liquefaction risk. Many sites experienced repeated liquefaction after former earthquakes in 1923 or 1987, if they existed in those times. In contrast to the recent liquefaction-prone soils, more-aged sands scarcely liquefied because of what is called the “ageing” effect. The present study analyzed cases in Tokyo area to quantitatively assess the temporal development of ageing so that liquefaction risk in more aged soils might be reasonably assessed. In the appendix, remarks are made of the reliability of air-photo survey in quick detection of liquefaction sites.