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| 1 | 基于时程分析法的尾矿坝动力稳定性研究显示文摘以云南省狮子山铜矿的大沙河尾矿库加高扩容工程为背景,为对其扩容前后坝体动力反应和稳定性进行系统研究和合理评估.采用动三轴试验,对库内3种尾矿(尾细砂、尾粉砂和尾粉土)的动强度和动模量与阻尼比进行了测试;综合运用时程分析法、剪应力对比法、有限元极限平衡法和软化模量法,对扩容前后尾矿坝的液化范围、安全系数和坝顶震陷等进行了定量分析,并对常规极限平衡法的局限性和适用条件进行了探讨.研究结果表明:1)尾矿的动剪应力比随围压的增大而有所降低,破坏时动孔隙水压力比随着破坏振次的增加而增大;2)在设置有效的排渗措施的情况下,尾矿坝的液化区域主要位于尾水覆盖区域表层;3)永久变形表现为坝坡上部沉降、下部向下游方向挤出的形式,且加高后坝顶震陷量和震陷率均有所增大.扩容后大沙河尾矿库坝体的动力稳定性有所降低,但仍能满足相关安全控制标准的要求. | 王文松 尹光志 魏作安 张千贵 曹冠森 敬小非 | 2018 | 中国矿业大学学报2018，47，2： | 8 |
| 2 | A column study of the hydro-mechanical behavior of mature fine tailings under atmospheric drying显示文摘In this paper, the hydro-mechanical behavior and physical properties of mature fine tailings(MFT) under atmospheric drying are investigated through a column study. In the study, evaporation takes place in the development of suction in the upper parts of the column and increasing suction leads to higher strength in the tailings. After 5 days, the suction in the first lift is around 17 k Pa in the upper part of the column.When a second lift is added, the first lift initially loses strength but over a 30 days' period, the strength is recovered to its prior value and suction in the second lift reaches 500 k Pa. The vane shear strength values show a substantial increase in the strength of the MFT after 30 days under atmospheric drying and drainage. The 90% strength found in the column exceeds the threshold(5 k Pa). The hydraulic-mechanical properties of the deposited tailings are closely coupled due to several mechanisms, such as evaporation,drainage, self-consolidation, suction and crack development. The findings of this study will provide a better understanding of the placement behavior of multiple lifts of MFT and thus contribute to reclamation design standards and reduce the use of dedicated disposal areas. | Anis Roshani Mamadou Fall Kevin Kennedy | 2017 | International Journal of Mining Science and Technology2017，27，2： | 2 |
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