地震学报Issue(5)：865-874,10.DOI:10.11939/jass.2015.05.014
地形效应影响下地震动参数与斜坡稳定性的相关性研究
On the correIation of ground motion parameters with sIope stabiIity incorporating topographic effects
摘要
Abstract
Topography has complex effects on ground motions.In assessing seismic landslide stability,the proper ground motion parameters are needed considering the topographic effects on slope stability.Based on the strong ground motion accelerations of the main shock of Wenchuan MS 8.0 earthquake recorded by the Zigong topographic array,we analyzed the variation of peak ground acceleration (PGA ), Arias intensity and 95% significant duration against the terrain’s height,and discussed the correlation betweem the stability of slope during an earthquake and PAG/Arias intensity,with the topographic effect being taken into consideration.The following results are concluded.① The amplification effect of topography on PGA and Arias intensity are both obvious.The amplification effect becomes generally stronger with the height of the terrain increasing,and the amplification effect is more obvious on horizontal ground motions than on the vertical component.For the horizontal ground motions,the amplification factors are between 1.1 and 1.8 for PGAs and between 1.2 and 3.3 for Arias intensity;the amplification coefficient are in the range from 1.1 to 1.3 and 1.2 to 1.7 for the vertical PGAs and Arias intensity, respectively.The discrepant amplification effect on PAG and Arias intensity shows the influence of topographic effects on strong motion is quite complex.② The topography can also amplify the duration of strong ground motions,but there is slight difference in the amplification effect among records from different heights and for different components,with the amplification factors all being about 1.3.③ Both Arias intensity and PGA can reflect the effects of topogra-phy on ground motions,and have strong correlations with the stability of slope. Compared with PGA,Arias intensity contains more information of the ground motions,and has a better capacity to capture the effects of topography on ground motions and on the potential seismic landslides hazard.关键词
自贡台阵/地形效应/Newmark/位移模型/峰值加速度/阿里亚斯烈度/持时Key words
Zigong topographic array/topographic effect/Newmark displace-ment model/PGA/Arias intensity/duration/slope stability/correlation analysis分类
天文与地球科学引用本文复制引用
刘甲美,高孟潭,陈鲲..地形效应影响下地震动参数与斜坡稳定性的相关性研究[J].地震学报,2015,(5):865-874,10.基金项目
国家公益性地震行业专项（201408014）和中央级公益性科研院所基本科研业务专项（DQJB13B03）共同资助． （）
