山东省场地类别分布及地震动峰值加速度区划调整

摘要

In this study,the site type data of 5220 construction sites in Shandong Province were collected,and the regional distribution of site types were analyzed by using the concept of distribution area,and site type zonation was conducted.Then,based on the seismic peak ground acceleration zonation and the adjustment coefficient of site type Ⅲ in Seismic Ground Motion Parameters Zonation Map of China,the seismic peak ground acceleration zonation of site type Ⅲ distribution region was adjusted,and seismic peak ground acceleration zonation of Shandong Province considering regional distribution of site types was obtained.The understanding of the spatial distribution of earthquake risk in Shandong Province was also enhanced.The results show that,site type distribution of Shandong Province presents a strong correlation with geomorphic zoning,in which site type Ⅰ-Ⅱ area contains central and southern mountain region (except for the plain area among mountains at its southwest) and eastern hilly area of Shandong Province,and site type Ⅲ area contains west plain area and the plain area among mountains at southwest of central and southern mountain region.In terms of the total area site type Ⅰ-Ⅱ region approximately accounts for 59.5％ of Shandong's land area and is 1.47 times of the area of site type Ⅲ region.After adjustment of the seismic peak ground acceleration zonation map,area ratio of fortification Ⅶl degree and above increases from 79％ to 90％,and seismic peak ground acceleration of 10 cities increases too.%首先,本文搜集了山东省5220个建设工程场地的资料,引入“分布区”的概念,统计分析了山东省场地类别的区域分布并进行了分区.然后,根据《中国地震动参数区划图(GB18306-2015)》中的山东省地震动峰值加速度区划以及Ⅲ类场地调整系数,对山东省Ⅲ类场地分布区的地震动峰值加速度区划进行了调整,得到了考虑场地类别分区的山东省地震动峰值加速度区划图,增进了对山东省地震灾害风险空间分布的认识.结果表明,山东省场地类别分布与地貌分区有很强的相关性,Ⅰ-Ⅱ类场地分布区包括鲁中南山地丘陵区(西南部的山间平原地带除外)以及鲁东丘陵区,Ⅲ类场地分布区包括鲁西北-鲁西南平原区和鲁中南山地丘陵区西南部山间平原地带.Ⅰ-Ⅱ类场地分布区约占全省陆地面积的59.5％,Ⅰ-Ⅱ类场地分布区与Ⅲ类场地分布区的面积比例约为1.47.地震动峰值加速度区划图经过调整后,Ⅶ度及以上设防区域占全省陆地面积的比例由79％提高到90％,10个地级市的峰值加速度有提高.