酸性环境下尾矿坝长期运行稳定性评估

The Long-term Stability Assessment of Tailing Dam under Acidic Environment

尾矿坝属于百年工程,在使用过程中需要考虑到长期在酸性环境下坝体的损坏,以及若干年后坝体的稳定性是否能够满足工程要求。为避免尾矿坝的建设和使用中因在酸性条件下所产生的长期效应带来的坝体失稳事故的发生,从酸性污染物的迁移、酸性环境下岩土体物理力学性质的变化和坝体稳定性分析三个方面分析了某尾矿坝在酸性环境下稳定性的变化规律,并对酸性环境下该尾矿坝长期稳定性进行了评估。结果表明:酸性环境对岩土体强度有较大影响,100年后坝体长期稳定性系数将降低近30%。因此,在此类尾矿坝的长期稳定性研究中应充分考虑酸性环境的影响。

Tailings dams are century projects.During the process of use,it needs to be considered whether the stability of dam can meet the requirements with the long-term dam damage under acid environment after several years.This paper aims at avoiding dam failure accidents due to the long-term effect in construction and utilization of tailing dams.The paper analyzes the long-term stability change discipline of a dam in the acidic environment from three aspects,including migration of acidic pollutants,changes of physical and mechanical properties of rock and soil in the acidic environment and calculation of dam stability.The study results show that acid environment has a great influence on the strength of rock and soil.After one hundred years,the long-term stability coefficient of the dam reduces nearly thirty percent.Therefore,in the study of this kind of long-term stability of tailing dams,the influence of the acid environment should be fully considered.