武山尾矿坝无纺土工织物滤层化学淤堵问题初探

土工织物作为滤层在尾矿坝排渗设施中已得到广泛应用,但有些尾矿坝遇到了土工织物淤堵问题。本文针对武山铜矿尾矿坝排渗系统中发生的土工织物淤堵问题,通过一系列试验研究对无纺土工织物化学淤堵问题进行了初步探讨。研究结果表明氢氧化铁凝胶在织物纤维上的附着是化学淤堵的主要机理,尾矿中含有充分多的细粒黄铁矿且滤层处于非饱和渗流带或饱和- 非饱和交替变化渗流带是土工织物发生严重化学淤堵的必要条件

A preliminary study on chemical clogging of nonwoven geotextile filter in Wushan tailings fill dam

Nonwoven geotextile as filter is widely used in the drainage installations of tailings fill dams. But clogging problem of geotextile has been found in some cases. In this paper, regarding the clogging problem happened in Wushan copper mine, a preliminary study on chemical clogging of geotextile through a series of laboratory experiment have been performed. The results show that the adherence of ironic hydroxide jel to the fiber of geotextile is the main mechanism of chemical clogging and the essential condition of serious chemical clogging is that the filter is located in unsaturated or cyclic saturated unsaturated seepage zone as well as enough of fine grained pyrite exist in tailings sand.