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根据江苏省连云港市对开发规划的紧迫要求,1985年进行了航空遥感和航空综合地球物理调查、地面电测深面积测量、微地震台网监视和井下土体横波速度测定。本文根据以上取得的实际资料并收集了历史地震资料,对连云港市地区地质构造稳定性进行评价。根据综合遥感和物探资料,将连云港约2000km2市区划分为四种地基类型,指出五个洪积层分区为工程宜地区,广泛分布的淤泥层区弱抗剪并有较大沉降率,淤泥层区当中的古河道和沙层区则有易沙土液化的潜在危险。对经济开发区按场地基水平加速度谱进行场地基和地震烈度小区划,指出I和II类地区具有优良工程地质条伯。本文还采用统计方法预测50年和100年五级地震发生概率。
According to the urgent requirements for development planning in Lianyungang City, Jiangsu Province, airborne remote sensing and integrated geophysical surveys conducted in 1985, surface electrical sounding area surveys, monitoring of microseismic networks, and determination of shear wave velocities of downhole soil were carried out. Based on the above actual data and historical seismic data collected, this paper evaluates the stability of geological structure in Lianyungang. According to the comprehensive remote sensing and geophysical data, about 2000km2 urban area of Lianyungang is divided into four kinds of foundation types. It is pointed out that the five alluvium layers are the engineering suitable areas, and the widely distributed silt layer is weakly sheared and has large sedimentation rate. The ancient river courses and sand zones in the area are potentially dangerous for liquefaction of sandy soil. Based on the horizontal acceleration spectrum of site foundation, the economic development zone is divided into small site and seismic intensity. It is pointed out that Class I and II regions have excellent engineering geological conditions. This paper also uses statistical methods to predict the occurrence probability of earthquakes of magnitude five in 50 years and 100 years.