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上游式尾矿坝的沉积规律 总被引:5,自引:0,他引:5
上游式尾矿坝的设计建造和安全管理中常用到一些基本参数。如初期坝高度、堆积坝外坡比、沉积滩长度、尾矿颗粒沿滩面的分布规律等。目前常用的断面概化方法是勘察和筑坝实验方法,都有一定的局限性。本文研究了分散排矿条件下常见尾矿的冲填沉积规律,推荐了一个上游式尾矿坝计算断面的概化方法。 相似文献
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以尹庄尾矿库为工程背景,通过现场沉积滩面及钻孔取样进行室内筛分试验、渗透试验,获得了上游式尾矿颗粒在库内沉积规律,建立了尾矿库概化地质模型,并通过三轴试验得到了概化模型中不同地层尾矿的应力应变关系;以测定的饱和含水量、残余含水量及饱和渗透系数及各尾矿颗粒级配曲线为基础,利用Fredlund-Xing模型获得了土-水特征曲线及渗流模型;以有效应力理论为依据,建立上游式尾矿库流-固耦合数学模型,对该库的应力场与渗流场进行分析,获得了坝体的应力场及孔隙压力的分布规律。研究成果可为尾矿库的设计、施工和安全生产提供技术支撑。 相似文献
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介绍了静力触探在上游式尾矿坝勘察中的应用,准确、连续地反映堆积尾矿的承载力特性等,非常适合尾矿沉积的不均匀性特征,为尾矿堆积坝的后续生产与稳定性分析提供可靠的依据。 相似文献
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《现代矿业》2020,(8)
针对上游式湿排尾矿库入库尾矿粒度偏细、浓度偏高、不易分选的特点,为实现尾矿的安全堆存,采用分级分区放矿,将粗细尾矿分级后,粗颗粒尾矿优先在坝前放矿,细颗粒尾矿在上游库内排放。通过在南京梅山山景尾矿库实施旋流器分级分区放矿筑坝试验,将入库尾矿经FX-250型水力旋流器在0.1 MPa压力下进行分级,将沉砂质量浓度稀释至35%以下排放在坝前,取样检测表明,坝前20 m范围内+0.075 mm尾矿占比在90%左右,坝前40 m范围粗颗粒含量明显增加。通过在粗尾矿沉积的坝前区构筑池填法子埂,使粗尾矿集中在坝前最小干滩长度范围内沉积形成安全超高区;将溢流汇集后经管道输送至上游库内排放。试验结果表明,上游式尾矿分级分区排放工艺能够很好地解决细粒高浓度尾矿采用坝前水力冲积放矿存在的防洪不足及坝体稳定性不高的问题。该尾矿堆存工艺在南京梅山山景尾矿库成功应用,既解决了尾矿库前期运行存在的潜在安全隐患,又节省了运行成本。 相似文献
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本文提供了尾矿坝材料(尾矿砂、尾矿泥)的地下剪切波速度的原位孔内测定结果,研究了这些筑坝材料的剪切波速度随深度和沉积距离的变化规律.这一规律,可为中国通常使用的上游筑坝的尾矿坝进行地震反应分析及坝体稳定性计算提供有用的数据.文中列举了我国最高尾矿坝动力稳定分析的计算结果. 相似文献
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针对上游式湿排尾矿库入库尾矿粒度偏细、浓度偏高、不易分选的特点,为实现尾矿的安全堆存,采用分级分区放矿,将粗细尾矿分级后,粗颗粒尾矿优先在坝前放矿,细颗粒尾矿在上游库内排放。通过在南京梅山山景尾矿库实施旋流器分级分区放矿筑坝试验,将入库尾矿经FX 250型水力旋流器在0.1 MPa压力下进行分级,将沉砂质量浓度稀释至35%以下排放在坝前,取样检测表明,坝前20 m范围内+0.075 mm尾矿占比在90%左右,坝前40 m范围粗颗粒含量明显增加。通过在粗尾矿沉积的坝前区构筑池填法子埂,使粗尾矿集中在坝前最小干滩长度范围内沉积形成安全超高区;将溢流汇集后经管道输送至上游库内排放。试验结果表明,上游式尾矿分级分区排放工艺能够很好地解决细粒高浓度尾矿采用坝前水力冲积放矿存在的防洪不足及坝体稳定性不高的问题。该尾矿堆存工艺在南京梅山山景尾矿库成功应用,既解决了尾矿库前期运行存在的潜在安全隐患,又节省了运行成本。 相似文献
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针对高寒地区高浓度尾矿库上游法筑坝过程中遇到的水力筑坝时间短、全尾脱水固结时间长且滩面软弱承载力低的状况,以分级上游法和池填法为基础,提出了分级上游池填法筑坝工艺,并依托某尾矿库开展了现场筑坝试验研究,对旋流分级筑坝系统的设计方案与调试方法进行了系统阐述,同时也详细介绍了现场筑坝试验流程及分级上游池填法的应用效果。现场试验结果表明,对于浓度60%以上且+200目颗粒为20%~30%的原尾矿,经旋流分级筑坝系统分选后,底流尾矿在满足+200目颗粒不低于65%的条件下产率可达30%以上;充填围埝池的底流尾矿能够在较短的时间内脱水固结并形成强度,底流沉砂滩面后期沉降速率稳定。分级上游池填法能够满足高寒地区高浓度尾矿库快速安全筑坝的需求。 相似文献
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为了查明重金属污染物在某尾矿库坝体中迁移情况并做出影响性预测,采用数值实验对该重金属尾矿库进行模拟计算,概化尾矿库坝体条件,建立地下水流动模型与地下水污染物(以尾矿浸出液中铜离子为例)迁移模型,利用TOUGH2软件模拟计算得出各个时刻铜离子污染物在坝体中的分布状态。模拟计算结果表明,铜离子污染物在地下水流场中运移以扇形向周围扩散,铜离子污染物在坝体中的运动规律符合地下水流场特征;随着时间的推移,运移范围在坝体内逐渐扩大;随着运移距离的增大,污染物浓度逐渐减小;在2 750 d时,铜离子出露于坝体进入自然环境,并产生影响。结果为尾矿库周边环境污染防治措施提供了依据。 相似文献
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Stability analysis of a copper tailings dam via laboratory model tests: A Chinese case study 总被引:1,自引:0,他引:1
Guangzhi Yin Guangzhi Li Zuoan Wei Ling Wan Guohong Shui Xiaofei Jing 《Minerals Engineering》2011,24(2):122-130
The upstream method is a popular method for raising tailings dams. Currently in China there are more than 12,000 tailings impoundments and almost 95% of them use the upstream method for the construction of the dam. Statistical data has shown that the tailings impoundment is one of the main sources of risk in the mining industry. Failures of tailings impoundments have resulted in the loss of many lives, considerable property damage, and irreversible pollution in downstream areas. Therefore, the safety of tailings management facilities has been of increasing concern to governments and local communities. The management of a conventional tailings storage facility requires the maintenance of a high level of structural stability. Therefore, according to the relevant mine Acts, the mine operators are required to conduct stability analyses for all types of tailings facilities, whether they are new, active, or decommissioned. For the stability analysis of tailings dams, the accurate profile of the tailings dam is very important. The profiles are easily obtained for both active and decommissioned tailings facilities because their data can be collected through field investigations. However, collecting basic data from newly constructed tailings facilities is difficult. In this paper, a laboratory physical model test has been performed. The construction process for new tailings impoundment has been physically simulated in the laboratory, where the tailings particle composition and distribution below a beach, the change of phreatic surface of the dam, and the engineering properties of the tailings of the dam profiles have been measured. A new tailings facility, Yangtianqin tailings impoundment, owned by Tongchang copper mine of Yuxi Mine Co., was used as a case study to illustrate the physical modeling of the tailings dam. In the model test, the geometrical model of pond area was constructed according to the scale factor, λL, of 1:200 (model:prototype), and the tailings discharge system was also established, the tailings slurry then being discharged based on the design data. Finally, on the basis of the model test results on profiles, the stability analysis of the tailings dam at different heights was conducted under different conditions. The model test results and stability analysis show that the height of the tailings dam should be less than that originally planned. The original design of Yangtianqing tailings impoundment should therefore be revised for the safety of the tailings impoundment. 相似文献
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尾矿库在渗流条件下的稳定性是影响整个矿山安全的重要因素。本文以国内某上游法堆筑尾矿库为研究对象,采用强度折减法对尾矿库在渗流条件下的稳定性进行了系统的分析,对比了不同失稳判别准则在尾矿库稳定性分析中的适用性和局限性,提出了以初期坝附近尾砂出现指向坝外、向上的变形矢量为标志的"变形矢量图准则"。研究结果表明,基于强度折减法进行尾矿库稳定性分析时,采用"变形矢量图准则"可以更准确高效地获得尾矿库的稳定安全系数。 相似文献