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投稿时间:2022-06-25 修订日期:2022-07-11
投稿时间:2022-06-25 修订日期:2022-07-11
中文摘要: 尾砂分级综合利用是目前国内鼓励的政策方针,但是综合利用实践过程中如尾砂分级粒径选取不当,将导致排入尾矿库的粗粒尾砂数量减少,细粒尾砂占比增加,而含黏性尾矿增加,使得新形成的堆积坝透水性变差,同时尾矿的平均强度指标、容重指标等均有所下降,最终将造成尾矿堆积坝透固结性能下降,坝体内浸润线抬升,增加了出现渗透变形破坏的可能性,严重时甚至会造成尾矿坝坍滑失稳。同时,由于筑坝尾矿细粒数量增多,导致尾矿沉积滩面坡度变缓,将减少尾矿库的调洪库容,降低尾矿库的排洪安全性。本文提出解决这一难题的关键在于尾砂分级粒径的取值必须以尾矿库的安全(包括尾矿坝的稳定安全和尾矿库的排洪安全)为中心展开一系列的研究论证工作,才能确保尾砂分级粒径取值的科学、合理。主要研究论证内容包括:研究分级后的尾矿物理力学特性变化情况、尾矿沉积滩平均坡度变化情况,并研究由于尾砂粒径改变之后,对尾矿坝沉积分布规律产生的影响。然后基于多种工况条件下重新进行尾矿坝渗流分析计算、尾矿库调洪演算和尾矿坝稳定分析计算,必要时还需要进行尾矿库溃坝试验研究。
Abstract:Classification and comprehensive utilization of tailings is currently a policy encouraged in China. However, improperly-selected particle size of tailings in the classification will result in a decrease in the amount of coarse tailings discharged into the tailings pond and an increase in the proportion of fine tailings during the comprehensive utilization, and the increased viscous tailings will make the water permeability of the newly-formed fill dam worse, thus decreasing the indicators of average strength and volume weight of tailings. Eventually, it will lead to performance degradation in the water permeability and consolidation of the tailings fill dam, thus making the seepage line in the dam elevated and increasing the possibility of seepage deformation and damage, and even cause the collapse and instability of the tailings dam in serious cases. Meanwhile, the slope of deposited tailings beach will become gentle due to the increase in the amount of fine tailings during the damming period, which will reduce the flood control capacity and flood discharge safety of the tailings pond. In this paper, the key to solve this problem is that the value of tailings particle size in the classification must focus on the safety of tailings pond (including the stability and safety of tailings dam and the flood discharge safety of tailings pond) to carry out a series of researches and demonstrations, so as to ensure scientific and reasonable value of tailings particle size in the classification. The main research and demonstration include the changes of physical and mechanical properties of tailings and the average slope change of the deposited tailings beach after classification, and the impact on the deposit distribution of tailings dam after changing the tailings particle size. Afterwards the seepage of tailings dam, flood control of the tailings pond and stability of tailings dam are re-analyzed and re-calculated under various working conditions. The dam break test and study of the tailings pond is also required if necessary.
keywords: tailings classification comprehensive utilization tailings fill dam seepage analysis stability analysis and calculation safety of flood control
文章编号:20220625002 中图分类号: 文献标志码:
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Author Name | Affiliation | |
SHEN Louyan | China Nerin Engineering Co,Ltd. | shenlouyan@nerin.com |
LU Jianjing | China Nerin Engineering Co,Ltd. | lujianjing@nerin.com |
引用文本:
沈楼燕,卢建京.尾砂分级综合利用对尾矿库安全稳定影响的研究[J].矿冶,2023,32(1):.
沈楼燕,卢建京.尾砂分级综合利用对尾矿库安全稳定影响的研究[J].矿冶,2023,32(1):.