【摘要】 利用山东地区实测的Ⅱ类场地358个钻孔和Ⅲ类场地140个钻孔的地震动峰值加速度,计算了各个钻孔不同超越概率的土层地震动峰值加速度的放大系数ks,结果表明:(1)同类场地土层放大系数ks值总体符合正态分布,既有相对集中性,也有离散性;(2)随着基岩面输入地震动强度的增大,ks值降低,且Ⅲ类场地ks值降低较Ⅱ类的更为明显;(3)Ⅱ类场地随着基岩输入面埋深的增加,ks值呈增加趋势,约达20m深后基本趋于稳定,而Ⅲ类场地基岩输入面埋深的增加对ks值的影响不甚显著;(4)Ⅱ类场地50年超越概率10%的平均ks值(1.47)略高于《中国地震动参数区划图》使用的全国平均ks值。本文尝试讨论了山东地区Ⅱ、Ⅲ类场地不同强度基岩峰值加速度输入的ks调整值。更多还原

【Abstract】 In this paper,amplification coefficient(ks) of peek ground motion with different exceedance probability in types Ⅱ and Ⅲ sites,Shandong Province was estimated by analyzing the data of seismic response of soil layer from 358 and 140 drills from types Ⅱ and Ⅲ sites separately.From the results,one can conclude that:(1) the scatter plot of ks data shows that it generally obeys normal distribution;(2) ks decreases with the increase of the strength of incident ground motion,a phenomenon more apparent in type Ⅲ sites than in type Ⅱ sites;(3) for type Ⅱ site,with the increase of depth of the top surface of bedrock where ground motion incident,ks would increase gradually to a stable value until it reaches a depth up to approximately 20 meters or larger,while type Ⅲ site ks is normally insensitive to the depth;(4) the average of ks for type Ⅱ site is 1.47,slightly larger than that used in the Seismic Ground Motion Parameter Zonation Map of China(GB18306-2001).The paper also discusses the rectified value of ks for different strength of incident ground motion in type Ⅱ and Ⅲ sites in Shandong Province.更多还原