武汉主城区液化潜能分区研究

摘要

Based on SPT-N data of seismic safety evaluation controlled drillings and the results of seismic ground motion parameter zonation in the urban area of Wuhan,the possibility of liquefaction of soil layers in rare earthquakes is determined by the method of code.The liquefaction index and the sites coordinates are used to draw the map of liquefaction potential in the urban area of Wuhan.The map initially predicts the possible liquefaction areas and severity levels,and also shows that the right bank of the Yangtze river contains both greater distribution area and stronger liquefaction potential than the left bank.Comparison analysis on the liquefaction data of four historical earthquakes illustrates that the possible liquefied sites in Wuhan urban area are characterized by shallow groundwater table,wide distribution and large buried depth of liquefied soil layers.%搜集并整理武汉主城区地震安全性评价控制性钻孔SPT-N资料,配合武汉市地震动参数小区划成果,采用规范法对各场地土层在罕遇地震作用下液化可能性进行判别.以液化指数作为分区指标并结合各场地坐标,绘制武汉主城区液化潜能分区图.分区图初步预测了罕遇地震发生以后,可能发生液化的区域及其严重性,且表明无论是分布面积还是液化潜能,长江右岸均大于长江左岸.通过与4次历史大震液化资料的对比分析,武汉主城区可能液化场地具有地下水位埋深浅、液化土层分布范围广、埋藏深度大的特点.