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《Journal of Earthquake Engineering and Engineering Vibration》 2013-01
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Classification of subsoil softening and preliminary analysis of its correlation with ground motion characteristics

CHEN Longwei1,YUAN Xiaoming1,LI Yurun2(1.Institute of Engineering Mechanics,China Earthquake Administration,Harbin 150080,China;2.School of Civil Engineering, Hebei University of Technology,Tianjin 300401,China)  
Based on the shear strain attenuation under seismic loading,the subsoil softening extent is classified in a comprehensive view.Meanwhile,the correlation between soil softening classification and ground motion characteristics was preliminarily studied by using a theoretical model.The analytical results show that subsoil softening can be classified into low softening,medium softening,high softening and flow failure(liquefaction);high-frequency components predominantly exist in ground motions when the soil is low and medium softening;long-period components,by contrast,in ground motions are considerably dominating when soil is high softening or flow failure(liquefaction);comparing to non-softening,PGA changes little with respect to low softening subsoil,but increases with increasing extent of soil softening till high softening;PGA under liquefaction is unpredictable;comparing to non-softening,long-period amplification and high-frequency de-amplification effects both exists in ground motion,nevertheless their proportional relationship depends on the products of soil softening class and input seismic ground motions;long-period amplification effect is comparable to high-frequency de-amplification effect in medium softening soil but greater than high-frequency de-amplification effect in high softening soil;liquefaction can remarkably amplify long-period motion;comparing to non-softening,the influence of soil softening on the proportional relationship of long-period amplification effect and high-frequency de-amplification effect is consistent with that on PGA amplification effect.
【Fund】: 中国地震局工程力学研究所基本科研业务费专项(2011B07);; 国家自然科学基金青年基金项目(51008110);; 国家自然科学基金(51278472)
【CateGory Index】: TU435;P315.9
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