Applications of a GIS-based geotechnical tool to assess spatial earthquake hazards in an urban area
Applications of a GIS-based geotechnical tool to assess spatial earthquake hazards in an urban area
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应用基于 GIS 的岩土工程工具评估城市地区的空间地震灾害
DOI：
10.1007/s12665-011-1180-z
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发表时间：
2012
影响因子：
2.8
通讯作者：
Chang
中科院分区：
文献类型：
--
作者：
Chang
在空间地理信息系统（GIS）框架下，以韩国庆州为例，构建了一个岩土工程信息系统（GTIS），以可靠地预测岩土工程信息并准确估计场地效应。该系统是基于收集和执行的现场调查数据以及获得的地理知识数据建立的。利用站点周期（TG）和30 m深度的平均横波速度（VS30）构建了地震区划图，并将这些图作为区域策略提出，以减轻研究区域的地震风险。特别是，tg分布图显示了2 - 5层建筑在0.2 - 0.5 s的周期内对地震动共振的敏感性和相应的地震易损性。还根据vs30值进行了场地分类的地震区划，以确定研究区内任何场地和行政亚单元的抗震设计和抗震性能评价的场地放大系数。此外，基于二维和三维空间有限元模型，利用GTIS预测的岩土次表层之间的空间界面坐标，在时域上对庆州地下和地表不规则性进行地震反应分析，研究了场地效应。这项实际研究证实，基于空间gis的岩土工程信息可以成为确定如何最好地减轻地震灾害的非常有用的资源，特别是在城市地区。
A geotechnical information system (GTIS) was constructed within a spatial geographic information system (GIS) framework to reliably predict geotechnical information and accurately estimate site effects at Gyeongju, an urban area in South Korea. The system was built based on both collected and performed site investigation data in addition to acquired geo-knowledge data. Seismic zoning maps were constructed using the site period (TG) and mean shear wave velocity to a depth of 30 m (VS30), and these maps were presented as a regional strategy to mitigate earthquake-induced risks in the study area. In particular, theTGdistribution map indicated the susceptibility to ground motion resonance in periods ranging from 0.2 to 0.5 s and the corresponding seismic vulnerability of buildings with two to five stories. Seismic zonation of site classification according toVS30 values was also performed to determine the site amplification coefficients for seismic design and seismic performance evaluation at any site and administrative subunit in the study area. In addition, we investigated the site effects according to subsurface and surface ground irregularities at Gyeongju by seismic response analyses in time domains based on both two- and three-dimensional spatial finite element models, which were generated using spatial interface coordinates between geotechnical subsurface layers predicted by the GTIS. This practical study verified that spatial GIS-based geotechnical information can be a very useful resource in determining how to best mitigate seismic hazards, particularly in urban areas.