尾矿库坝外排土压坡对其稳定性影响的数值分析

Numerical analysis of the effect of dump slope on the tailings dam's stability

为了解决排土场征地困难及降低生产成本,矿山企业拟在运行尾矿库坝外大量排土压坡。为此,为探讨坝外排土压坡对尾矿库安全性的影响,本文采用数值方法研究了排土压坡前后尾矿坝的浸润线、孔隙水压力及抗滑稳定性的变化规律。结果表明:排土体底层是否具有良好的排水性能和排土体自身是否具有较高的抗滑稳定性,是排土压坡是否可行的关键。尾矿库坝外排土压坡运用得当,不仅可以提高尾矿坝的安全稳定性,而且还能解决矿山采矿剥离产生大量废弃岩土的堆存问题,这一做法可供类似矿山企业参考。

In order to solve the difficulty in using land for waste dump and reduce the production cost , the mining enterprise is going to dump a large number of waste soils outside the tailings dam .Therefore ,in order to discuss the effect of dump slop on the safety of the tailings reservoir ,the numerical method is adopted to study the change law of the seepage line ,pore water pressure and anti-sliding stability before and after the dump slope .The results show that the key of the dump slope feasibility is the dump bottom layer＇s drainage performance and the dump soil＇s sliding resistance .The appropriate dump slop work can not only improves the tailings dam＇s stability ,but also solves the waste dump problem in mining work ,which can offer some references to the similar mining enterprise .