Study on the Ground Motion Parameter Microzonation for Cities in the Flat—Taking Gaoyou City as an Example

我国平原地区幅员辽阔、城市林立，人口密集、经济发达，防震减灾工作尤为重要。高邮市位于长江下游的苏北平原，以高邮市城区为例，研究这类场地的地震动效应特征，对影响地震动参数小区划成果的几个主要因素进行总结与探讨。考虑多方因素进行钻孔布设；增加地震动概率水平；利用统计分析理论，补充数据，建立土层力学模型；利用地表峰值加速度放大倍数等，研究如何减轻等效线性化方法低估高频地震动的缺陷。 China’s flat areas are vast, and as a largely urbanized, densely populated, economically developed country, the job of earthquake prevention and disaster reduction is especially important. Gaoyou lies in north Jiangsu plain which located in the lower reaches of Yangtze river. Taking Gaoyou city as an example, this paper studies the characteristics of ground motion, and summarizes and discusses several main factors influencing ground motion parameter microzonation. Borehole layout after considering many factors, increasing the level of ground motion probability, using statistical analysis theory, supplementing data, building soil mechanics model, using surface peak acceleration to magnify times, to study on how to alleviate the defect of equivalence method on underestimating high frequency ground motion.