一、江砂耐震的印象在长江江苏段沿江地区浅层经常遇到粉细砂(以下简称江砂),是江苏省水利工程事故的多发地区.笔者对江砂分布区内80多组具有最大和最小孔隙比数据的砂样,以粉土、粉砂为一类,细砂、极细砂为另一类,计算出它们的相对密度(D_r),绘制天然孔隙比(e)与相对密度(D_r)的关系曲线(图2),与《工业与民用建筑地基基础设计规范》(TJ7-74)中的e～D_r曲线相对照,发现在天然孔隙比相同条件下,江砂的D_r明显 First, the impression of Jiangsha earthquake-resistant In the Yangtze River along the Yangtze River in Jiangsu region often encountered fine sand (hereinafter referred to as river sand), Jiangsu Province, water conservancy accidents in multiple areas.The author of the river sand distribution area has more than 80 groups And the minimum porosity ratio data to sand, silt as a class, fine sand, fine sand for the other class, calculate their relative density (D_r), draw the natural porosity ratio (e) and the relative density (D_r) (Fig. 2). Compared with the e ~ D_r curve in the “Code for Design of Foundations for Industrial and Civil Foundations” (TJ7-74), it is found that the D_r of the river sand is significantly higher under the same natural porosity ratio