技术报告-尾矿库设计及评估 (英文)(25)

技术报告-尾矿库设计及评估 (英文)

Design and Evaluation of Tailings Dams

and results in less seepage. There are also drawbacks to this design, including the relatively large volumes of

material necessary for construction, and its effect on cost. The increased length of the embankment walls also

may increase the possibility of failure (Robertson 1984, cited in Ritcey 1989). Other disadvantages of the

ring dike system are that the impoundment rises above the surrounding terrain, creating an aesthetic problem

in some locations, and there can be considerable wind erosion of the tailings. In many areas, also, there is no

flat terrain suitable for ring-dike designs.

Although each situation needs to be evaluated on its own merits, the ring dike system has the potential for

better control of seepage than that found in most valley dam locations. If warranted by the characteristics of a

particular tailings, almost total containment and collection of effluent can be achieved using a suitable

combination of low permeability cores, liners, and drainage system. Since seepage control is often a pressing

environmental concern with tailings impoundments, the ring dike system can have an important advantage

over most other layouts.

2.2.3In-Pit Impoundments

This method is much less common than the valley and ring-dike impoundments. It consists of disposing

tailings material into a previously mined pit. The design initially eliminates the need for dike construction.

Since the tailings are protected by pit walls, wind dispersion is minimized. Good drainage can be

incorporated into the design. Many of the failure modes common to tailings embankments (e.g., piping,

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