Field experimental cells to evaluate the hydrogeological behaviour of oxygen barriers made of silty materials
Field experimental cells to evaluate the hydrogeological behaviour of oxygen barriers made of silty materials
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DOI：
10.1139/t06-120
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发表时间：
2007-03-01
影响因子：
3.6
通讯作者：
Chapuis, Robert P.
中科院分区：
文献类型：
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作者：
Bussiere, Bruno;Aubertin, Michel;Chapuis, Robert P.
一个原位研究开始，以评估效率的淤泥作为保湿材料的覆盖物与毛细屏障效应（CCBEs），旨在控制生产的酸性矿山排水（AMD）。这项调查包括建设四个实验细胞覆盖不同的分层覆盖配置。每个CCBE都装有仪器，以监测其水文地质行为。保湿（粉质）材料的饱和度（S-r）通常保持在85%以上，而粉质上下两个砂层的S-r通常低于30%-50%（高效CCBE的典型水文地质行为）。在四个CCBE的不同层的吸力测量与所观察到的S-r测量在四年的监测一致。在保湿材料中测得的吸力低于其各自的空气进入值（AEV），而吸力大大超过了毛细管破裂层中的砂的AEV。氧通量计算证实，在四个CCBE中的每一个中，通过CCBE的通量在实验的整个持续时间内保持较低，因此限制了AMD的产生。这项研究也证实了粉质材料的能力，作为水分保持在CCBE。
An in situ study was initiated to evaluate the efficiency of silts as moisture-retaining material in covers with capillary barrier effects (CCBEs) that aim at controlling the production of acid mine drainage (AMD). This investigation included the construction of four experimental cells covered by different layered cover configurations. Each CCBE was instrumented to monitor its hydrogeological behaviour. The degree of saturation (S-r) in the moisture-retaining (silty) materials was usually maintained above 85%, while S-r in the two sand layers placed above and below the silts was generally lower than 30%-50% (typical hydrogeological behaviour of efficient CCBEs). Suction measurements in the different layers of the four CCBEs were consistent with the observed S-r measurements during the four years of monitoring. The suctions measured in the moisture-retaining materials were lower than their respective air-entry values (AEV), while suctions largely exceeded the AEV of the sand in the capillary break layers. The oxygen flux calculations confirm that in each of the four CCBEs the flux through the CCBEs remained low for the entire duration of the experiment, hence limiting the generation of AMD. This study also confirmed the ability of silty materials to act as moisture retaining in a CCBE.