Characteristics of seismic responses at liquefied and non-liquefied sites with same site conditions

作     者：Jianjing ZHANG Changwei YANG 

作者机构：The Institute of Geological ＆ Nuclear Science Lower Hutt 5040 New Zealand School of Civil Engineering Southwest Jiaotong University Chengdu 610031 China 

出 版 物：《Journal of Modern Transportation》 (现代交通学报（英文版）)

年 卷 期：2011年第19卷第2期

页      面：134-142页

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 08[工学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 070801[理学-固体地球物理学] 0708[理学-地球物理学] 081402[工学-结构工程] 081304[工学-建筑技术科学] 0802[工学-机械工程] 0813[工学-建筑学] 0814[工学-土木工程] 0801[工学-力学（可授工学、理学学位）] 0823[工学-交通运输工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China (No. 41030742) Technology Research of Railway Ministry (No. 2009G010-C) 

主　　题：seismic responses liquefied and non-liquefied excessive pore-water pressure 

摘      要：To understand the characteristics of seismic response at liquefied sites, a liquefiable site and a non-liquefiable site were selected, separated by about 500 m and having the same site conditions as Class D in the National Earthquake Hazards Reduction Program （NEHRP）. A suite of earthquake records on rock sites are selected and scaled to the spectrum of the Joyner, Boore, and Fumal （JBF） attenuation model for a magnitude 7.5 earthquake at a distance of 50 km. The scaled records were then used to excite the two sites. The effect of pore-water pressure was investigated using the effective stress analysis method, and nonlinear soil behavior was modeled by a soil bounding surface model. Comparisons for spectra, peak ground acceleration （PGA）, peak ground displacement （PGD） and permanent displacement were performed. Results show that the mean ground response spectrum at the non-liquefied site is close to the estimated ground response spectrum from the JBF model, but the mean ground response spectrum at the liquefied site is much lower than the estimated ground response spectrum from the JBF model for periods of up to 1.3 s. The mean PGA at the non-liquefied site is about 1.6-1.7 times as large as that at the liquefied site, but the mean peak ground displacement （PGD） at the non-liquefied site has a slight difference with that at the liquefied site. The mean permanent displacements at the liquefied site are larger than those at the non-liquefied site, particularly at the liquefied layer.