文章摘要

文章信息/Info

Title:: Study on Amplification Effect of Peak Ground Acceleration Based on Different Sites in Shandong Province

Author(s):: YAN Jingru; ZHANG Yushan; HAO Minghui; (China Earthquake Disaster Prevention Center,Beijing 100029,China)

Keywords:: site effect; site classification; PGA; amplification coefficient

摘要:: 搜集整理“场地勘察钻孔数据库及分析平台系统”中山东省278个土层结构数据相对完整的钻孔剖面,采用一维等效线性化地震反应分析方法,计算II类和III类场地在5种实际基岩地震动作用下的场地反应,分析场地地震动峰值放大系数随场地类别、等效剪切波速、输入地震动强度的变化特征。结果表明:①场地土对输入地震动具有放大作用,这种放大作用随着地震动输入强度的增大在II,III类场地呈现不同的趋势; ②对比所有场地不同地震强度的PGA平均值及拟合曲线发现,II类场地PGA多数情况高于III类场地; ③分析所有场地土层PGA随v_se变化情况,发现在D,E强震作用下,PGA在v_se>350 m/s变化趋势平缓,因此提出II类场地更为细致的划分方法,并给出各类场地地震动参数变化的经验关系式及其系数值。

Abstract:: By collecting and sorting the 278 borehole profiles with comparatively complete soil structure data in Shandong province from the In-site Investigation Borehole Database and Analysis Platform System,this article calculates the site response of class-II and class-III sites under the effect of 5 different kinds of actual rock earthquake by applying linear equivalent response analysis method on one-dimensional soil layer,analyzing how the peak ground amplification coefficient changes according to the different sites,shear wave velocity and input earthquake intensity. The results show that:① the soil in the site would amplify the input earthquake,and the effect acts differently in class-II and class-III site as the input earthquake intensified; ② by comparing the average PGA and fitting curve of different earthquake intensity in all sites,it can be concluded that the PGA in class-II is higher than that of class-III in most conditions; ③ by analyzing the change of PGA with V_se in all sites,it can be concluded that when V_se>350 m/s,the trend of the PGA is even under the strong earthquake effect of D and E. So,this article proposes a more thorough classification method for class-II site and gives the changes of the earthquake parameters in all kinds and the coefficient values.