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首页> 外文期刊>Canadian Geotechnical Journal >Field experimental cells to assess hydrogeological behaviour of store-and-release covers made with phosphate mine waste
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Field experimental cells to assess hydrogeological behaviour of store-and-release covers made with phosphate mine waste

机译：现场实验池，用于评估磷酸盐矿山废弃物的储放盖的水文地质行为

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摘要

A field investigation was conducted to evaluate the effectiveness of store-and-release (SR) covers made with different phosphate mine wastes in reducing water infiltration (system inclination and surface runoff were neglected) and controlling acid rock drainage (ARD) generation. Four instrumented experimental cells were constructed with different SR layer configurations (two thicknesses and three materials) placed over a capillary break layer. To assess the hydrogeological behaviour of these cover systems, volumetric water content, matric suction, and meteorological monitoring time trends were studied for a period of 1.5 years under actual and extreme conditions typical of an arid climate. Under natural climatic conditions, all net infiltration was released to the atmosphere by the physical process of evaporation (regardless of SR layer thickness and type). Although high surface matric suction (>3000 kPa) decreased the evaporation rate (or release capacity) during the drying period, field tests showed that the studied scenarios limited deep water infiltration even under extreme rainfall events. The release capacity of the SR layer was slightly lower for cover systems made with the finer-grained mine waste (phosphate limestone tailings). This study showed that, for a one-dimensional (1D) condition, the tested phosphate mine wastes have the appropriate hydrogeological properties to be used as components of SR covers under conditions at the Kettara mine site, located near Marrakech, Morocco.
机译：进行了现场调查，以评估用不同磷酸盐矿山废物制成的储放盖（SR）在减少水渗透（忽略系统倾角和地表径流）和控制酸性岩石排水（ARD）产生方面的有效性。用毛细管断裂层上的不同SR层配置（两种厚度和三种材料）构建四个仪器化的实验池。为了评估这些覆盖系统的水文地质行为，研究了在干旱气候的典型和极端条件下1.5年内的体积水含量，基质吸力和气象监测时间趋势。在自然气候条件下，所有净渗透都是通过物理蒸发过程释放到大气中的（与SR层的厚度和类型无关）。尽管较高的表面基质吸力（> 3000 kPa）会降低干燥期间的蒸发速率（或释放能力），但现场测试表明，即使在极端降雨事件下，所研究的情景也限制了深水的渗透。对于由细粒矿山废料（磷酸盐石灰石尾矿）制成的覆盖系统，SR层的释放能力略低。这项研究表明，对于一维（1D）条件，在摩洛哥马拉喀什附近的Kettara矿场条件下，所测试的磷酸盐矿废物具有适当的水文地质特性，可以用作SR覆盖层的组成部分。

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