大塔冲高浓度尾矿沉积规律及3号副坝稳定性研究

发布时间：2018-07-11 14:45

本文选题：尾矿库 + 高浓度　；参考：《昆明理工大学》2017年硕士论文

【摘要】：尾矿库是矿山企业安全生产的重中之重,尾矿坝的稳定状况不仅仅关乎到矿山企业能否持续性生产,也关系到周边的生态环境,更关乎到下下游人民群众生命财产安全。但是,随着我国经济的飞速发展,采矿量也越来越多,采矿工业也得到了较大的发展,尾矿库增容使用情况也越来越多。本文以大塔冲高浓度尾矿库为研究对象,分析了堆积尾矿的沉积规律,运用有限元方法对尾矿库不断加高扩容的过程中的稳定性进行分析,并运用不同的有限元软件分析了尾矿库不同工况下的二维、三维稳定性,并得出以下几点结论:(1)通过三次实验数据对比分析,采用高浓度排矿方式时,堆积尾矿在固结程度、抗剪强度指标随着时间变化都有提高的趋势。(2)根据颗粒分析实验数据可以得到大塔冲尾矿坝堆积尾矿颗粒粒径较细,堆积尾矿主要是尾粉土,颗粒级配较好,堆积坝抗液化能力强。(3)根据实验数据分析了大塔冲高浓度尾矿的沉积规律,在水平方向上和低浓度排矿方式的沉积规律相似;但是在垂直方向上采用高浓度排矿方式的沉积规律不太明显。(4)运用MIDAS-GTS建立二维有限元模型,分析了不同工况下的浸润线和堆积坝稳定性。从结果可以看出,随着坝体的加高,尾矿坝浸润线增高,坝体安全系数下降。(5)运用MIDAS-GTS建立三维有限元模型,计算的浸润线与二维计算的浸润线几乎相同。通过稳定性分析的结果,当坝体加高7m、10.5m后正常时期的坝体可以满足使用要求;但是,坝体加高7m、10.5m后洪水期的计算结果显示不满足使用要求,因此在尾矿坝使用过程中一定要注意坝体的排渗措施。
[Abstract]:Tailings reservoir is the most important part of safe production in mining enterprises. The stability of tailings dam is not only related to the sustainable production of mining enterprises, but also related to the surrounding ecological environment, but also to the safety of people's lives and property in the lower and lower reaches. However, with the rapid development of China's economy, the amount of mining is increasing, the mining industry has also been greatly developed, and the capacity and use of tailings reservoir has become more and more. This paper takes Data Chong high concentration tailings reservoir as the research object, analyzes the deposition law of the piled tailings, and analyzes the stability of the tailings reservoir during the process of increasing and expanding by using finite element method. The 2D and 3D stability of tailings under different working conditions is analyzed by using different finite element software. The following conclusions are drawn: (1) through the comparison and analysis of three times of experimental data, the consolidation degree of piled tailings is obtained when high concentration ore discharging method is adopted. The shear strength index has a tendency to increase with time. (2) according to the experimental data of particle analysis, it can be found that the particle size of Data Chong tailings dam is fine, the bulk tailings are mainly silt, and the particle gradation is better. (3) according to the experimental data, the deposition law of Data Chong high concentration tailings is analyzed, which is similar to that of low concentration discharge in horizontal direction. However, the deposition pattern of high concentration ore discharge in vertical direction is not obvious. (4) using MIDAS-GTS to establish a two-dimensional finite element model, the stability of infiltration line and stacking dam under different working conditions is analyzed. It can be seen from the results that with the increase of dam body, the seepage line of the tailings dam increases and the safety factor of the dam decreases. (5) using MIDAS-GTS to establish a three-dimensional finite element model, the calculated infiltration line is almost the same as that calculated in two dimensions. According to the results of stability analysis, the dam body in normal period can meet the requirements when the dam body is raised by 7 m or 10.5m, but the calculation results of flood water period after the height of 7 mm ~ (10. 5 m) show that the dam body does not meet the requirements of application. Therefore, it is necessary to pay attention to the seepage discharge measures during the use of tailings dam.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TD926.4

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