Lateral spreading of ports in the 2014 Cephalonia, Greece, earthquakes
Lateral spreading of ports in the 2014 Cephalonia, Greece, earthquakes
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2014 年希腊凯法利尼亚岛地震中港口横向扩展
DOI：
10.1016/j.soildyn.2019.105874
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发表时间：
2020
影响因子：
4
通讯作者：
Platis, A.
中科院分区：
文献类型：
--
作者：
Athanasopoulos, G.A.;Kechagias, G.C.;Zekkos, D.;Batilas, A.;Karatzia, X.;Lyrantzaki, F.;Platis, A.
介绍了 2014 年双重地震（Mw6.1 和 6）中希腊凯法利尼亚岛两个填海港口区横向扩散的案例历史。通过地面测量直接测量了两个港区沿垂直于码头墙的 24 条横断面的横向地面位移。在整个港口都观察到砾石大小的填充物液化，并且在地震动较高的利科苏里港更为明显。最大累积水平地面位移范围为 3cm 至 152cm，具体取决于样线位置和自由面高度，而横向地面移动的内陆范围为 10m 至 90m。与利科苏里港相比，阿尔戈斯托利港码头墙的横向移动较小。还提供了两个港区的强烈地震记录以及相关的地震构造数据，以及通过整合来自勘探钻孔、试验坑、现场地质和目击者对该地区填海历史的描述而编制的可用岩土工程数据。得出了以相似的码头壁高度和现场条件为特征的横断面组的平均累积横向位移，并使用自由场条件的经验关系与横向扩展预测进行比较。研究发现，与基于自由场条件假设的经验预测相比，重力型码头墙后面的横向扩散幅度明显较低。横向地面运动的减少取决于码头墙的高度，对于 6m 或更高的墙高，甚至可能会降低一个数量级。这项研究的结果有助于评估港口区域的码头壁运动，特别是当码头壁后面发生液化时。
A case history is presented of lateral spreading in two reclaimed port areas of the Cephalonia island, Greece, in the 2014 earthquake doublet (Mw6.1 & 6). Lateral ground displacements along 24 transects perpendicular to the quay walls in the two port areas were directly measured by ground surveys. Liquefaction of gravel-size fills was observed throughout the ports and was more pronounced in Lixouri port where ground motions were higher. The maximum cumulative horizontal ground displacements ranged from 3 cm to 152 cm, depending on the transect location and height of free face, whereas the inland extent of lateral ground movement ranged from 10 m to 90 m. Lateral movement of the quay walls in Argostoli Port was lower compared to Lixouri Port. Strong motion recordings in the two port areas as well as pertinent seismotectonic data are also presented along with the available geotechnical data compiled by integrating information from exploratory borings, trial pits, site geology and eye-witness accounts of the reclamation history of the areas. Average cumulative lateral displacements for groups of transects, characterized by similar height of quay wall and field conditions were derived and compared to lateral spreading predictions using an empirical relationship for free field conditions. It was found that the magnitude of lateral spreading behind the gravity-type quay walls was significantly lower compared to empirical predictions based on the assumption of free field conditions. The reduction of lateral ground movement depends on the height of quay wall and may even be an order of magnitude lower for wall heights of 6 m or greater. The findings of this study contribute in assessing quay wall movement in port areas especially when liquefaction has occurred behind the wall.
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