中文摘要：

以云南2个矿山生产的粗尾砂和细尾砂为堆坝材料,通过室内小比例渗流堆坝模型试验和现场实测,对粗、细尾砂在堆坝过程中渗流规律进行对比研究。研究结果表明：（1）细粒尾砂堆积坝的浸润线较粗粒尾砂堆积坝高的原因有两方面：①细粒尾矿自身渗透性差;②在堆坝过程中,细粒尾砂在用于防漏作用的土工布上形成了一层较密实的防水层,堵塞了土工布排水小孔,阻碍了尾矿坝排渗效果;（2）粗、细粒尾矿堆积坝的坝前沉积规律基本相同,即同一水平面上为前缘细后部粗,上部粗下部细,但粗粒尾矿堆积坝形成的干滩面坡度较大,为1.0%～2.5%,而细粒尾矿堆积形成的干滩面坡度比较平缓,为0.3%～0.9%;（3）根据尾矿坝的整体排渗效果,提出＂尾矿坝相对渗透率＂的概念,在外部条件基本相同的情况下,细粒尾砂堆积坝的相对渗透系数约为粗尾砂堆积坝的25%;（4）由于细粒尾矿渗透性较差,浸润线偏高,造成尾矿坝坝坡水头压力较大,极易引起坝坡渗透破坏。研究成果对类似尾矿堆坝的研究具有重要的指导意义。

英文摘要：

Taking the materials of the coarse and fine tailings from two tailings pond in Yunnan Province for example,the dam model experiment and field measurement were performed to study the seepage laws of coarse and fine grained tailings dam. The research results show that：（1） The reasons for that the seepage line of fine tailings dam is lower than that of coarse tailings dam are two aspects：① the permeability of fine tailings is lower than that of coarse tailings;② the fine tailings are deposited on the geotechnical fabric and formed a non-watertight layer,and it plugs the geotechnical fabric′s drainage pore and make the effect of water drainage be lower obviously. （2） The sedimentary laws of coarse and fine tailings on the tailings beach were the same,i.e. the fine tailings are at front and the coarse tailings are at back in a same horizontal plane,on the top,there are coarse tailings and at the bottom were fine tailings. But the gradient of coarse tailings beach is steep which is about 1.0%–2.5%,and that of the fine grained tailings beach is only about 0.3%–0.9%. （3） From the whole water penetrability of tailings dam,the relative permeability is put forward. The relative permeability of fine tailings dam is only 25% of coarse tailings dam in same external conditions. （4） Because the water penetrability of fine tailings is lower and the height of seepage line is higher,the head pressure of fine tailings dam is large to make the dam failure. The research results are of significance for similar tailings dam engineering.