陕西潼关金矿区泥石流潜势度评价

Potentiality degree assessment of slag mudslide geo-hazard on the gold mine area in Tongguan,Shaanxi Province

陕西潼关金矿区位于小秦岭北坡,区内发生的泥石流灾害,其物源90%是采矿弃渣。本文选择采矿弃渣量、纵坡降比、渣堆补给长度与沟长比、沟岸山坡坡度、河流弯曲程度、河流堵塞情况、渣堆稳定性、流域面积、历史上有无泥石流灾害发生等9个泥石流发生的因子,在给定因子权重排序的基础上,采用因子权值与因子赋值相乘后相加的方法,求得18条沟谷泥石流潜势度指数及其排序。在降雨量相同的条件下,潜势度指数可似比风险度指数。

The Tongguan gold mine situates at north foothill of Xiaoqinling, and mining dregs account for 90 percent of material origin of the mudslide. Nine factors, including amount of mining dregs, longitudinal gradient ratio, ratio of supply length of dregs pile to the ditch length, gradient of hillslope, amount of curved reach, conditions of blocked stream, stability of mining dregs, watershed area and the mudslide frequency in history, are selected as the indexes on mudslide potentiality and their orders of eighteen valleys are counted by statistics method. It is concluded that the indexes on mudslide potentiality equals to that of the risk upon condition that equal rainfall in seven valleys.