高烈地震带内膏体排尾坝体稳定性分析

Stability Analysis of Paste Tailings Dam in High Seismic Region

尾矿坝的稳定是矿山安全生产的重要保障。为了研究在高烈地震带内某上游式膏体排尾尾矿库的稳定性,用Slide软件计算正常及地震工况下湿排和膏体排尾尾矿库的稳定性并进行稳定性分析。结果表明,湿排尾矿库的坝体抗滑稳定最小安全系数随地震烈度的增加降低较快,膏体排尾尾矿库的坝体抗滑稳定最小安全系数随地震烈度的增加降低较慢;湿排和膏体排尾坝体抗滑稳定最小安全系数降低规律基本一致,降低曲线呈"S"型,降低过程可分为降低初始时期、加速时期以及减速时期;不同地震烈度下膏体排尾与湿排坝体抗滑稳定最小安全系数的比值K先增加后降低;湿排尾矿库的稳定性受地震影响较大,膏体排尾尾矿库的稳定性受地震影响较小。因此,在高烈地震带内,采用膏体排尾的尾矿库更稳定。

The stability of tailings dam is an important guarantee for safe production in mine.In order to study the stability of an upstream paste tailings in the high-seismic zone.the slide software was used to calculate the stability and stability analysis of wet tailings and paste tailings dam under normal and seismic conditions.The results show that the minimum safety factor of dam anti-sliding stability of the wet tailings dam decreases rapidly with the increase of seismic intensity.The minimum safety factor of dam anti-sliding stability of the paste tailings dam decreases slowly with the increase of seismic intensity.The decreasing laws of minimum safety factor of the anti-sliding stability of the wet row and the paste tailing dam body is basically the same,and the reduction curve is "S" type.The reduction process can be divided into the reduction of the initial period,the acceleration period,and the deceleration period.The ratio K of the minimum safety factor of the anti-sliding stability of the paste tailings and wet tailings dam under different conditions increases first and then decreases;the stability of the wet tailings dam is greatly affected by the earthquake,and the stability of the paste tailings dam is less affected by the earthquake.Therefore,in the high seismic region,the tailings dam with the paste are more stable.The research results of this paper provide references for tailings disposal in high intensity seismic region.