摘要
2013年4月20日芦山地震中天权县思经乡出现了地震烈度VIII度异常区。基于地脉动测试技术,本文研究了思经乡异常区的出现与场地条件间的关系。首先调查了思经乡的地形、地貌和地质条件等场地特征,发现思经乡第四季土层覆盖较薄,下层为颗粒较大的砾石和鹅卵石等,是良好的民用双层建筑建设场地。然后,通过地脉动测试技术,分别测试了思经乡部分场地和民居的特征频率,发现思经乡场地特征频率与现有民用两层建筑特征频率相近。这种情况对建筑物抗震性能的发挥极为不利,可被初步认定为思经乡异常区产生的主要原因。
The Sijing town is an abnormality intensity area( VIII) in Lushan earthquake on April 4th,2013.Based on the micro-tremor testing technique,the relationship between the abnormality intensity area and the site conditions is studied. First,the site conditions of the Sijing town are investigated,and we find that the sites are perfect for the constructions of the duplex apartments. Then,by using the micro-tremor testing technique,the predominant frequencies of the buildings and sites around the hope primary school are given,respectively. We find that the predominant frequencies of the duplex apartments are similar to those of the sites. This condition does not benefit the architectural security,and we believe that this is the main reason,which cause the occurrence of the high-intensity abnormality area.
出处
《地震工程与工程振动》
CSCD
北大核心
2014年第S1期232-237,共6页
Earthquake Engineering and Engineering Dynamics
基金
中国地震局工程力学研究所基本科研业务专项(2013B04)
国家自然科学基金项目(51308512)
关键词
芦山地震
异常区
地质环境
地脉动
单点谱比法
Lushan earthquake
abnormality area
geological environment
micro-tremor
spectral ratio method
