小打鹅尾矿库筑坝尾矿的动力学特性试验研究

发布时间：2018-05-19 22:31

  本文选题：采矿工程 + 尾矿　； 参考：《岩石力学与工程学报》2017年S1期

【摘要】：以小打鹅尾矿库筑坝尾矿为研究对象,对尾粉砂和尾粉土2种尾矿,在自然固结和机械碾压2种密度条件下,进行动三轴试验的对比研究,获得2种尾矿的动力学特性。在动三轴试验前,对试验试样的粒度大小和颗粒形貌等进行详细测试,使研究成果更有针对性。结果显示:尾矿中黏粒组分非黏土矿物,黏粒组分的增多不能提高尾矿的动强度。不同围压下的2种尾矿的动剪应力比τ_d/σ_(3c)归一性均较好。破坏时的动孔隙水压力比μ_d/σ_(3c)随破坏振次N_f增大而增大,动应力对其的影响较小。动内摩擦角φ_d随破坏振次N_f的增加而降低,有效动内摩擦角φ'_d的变化受动孔隙水压力μ_d的影响。最大动弹性模量E_(d0)随围压和固结比的增大而增大,而最大阻尼比λ_(max)随围压和固结比的增大而有所减小。相比于尾粉砂,尾粉土的动强度与动弹性模量明显较低。机械压密后,2种尾矿的动力学特性均有所提高,且尾粉土的提高效果更为显著。
[Abstract]:The dynamic triaxial tests of two kinds of tailings, silt and silt, were carried out under the conditions of natural consolidation and mechanical compaction. The dynamic characteristics of the two kinds of tailings were obtained. Before the dynamic triaxial test, the particle size and morphology of the test samples were measured in detail, which made the research results more targeted. The results show that the dynamic strength of the tailings can not be improved by the increase of the clay component in the tailings, and the increase of the clay components can not improve the dynamic strength of the tailings. The dynamic shear stress ratio 蟿 d / 蟽 C of two tailings under different confining pressures is better. The dynamic pore water pressure ratio 渭 _ (d / 蟽) _ (3c) increases with the increase of the failure vibration degree N _ (F), but the dynamic stress has little effect on the dynamic pore water pressure. The dynamic internal friction angle 蠁 _ d decreases with the increase of the failure vibration degree N _ f, and the change of the effective dynamic internal friction angle 蠁 _ d is affected by the dynamic pore water pressure 渭 _ d. The maximum dynamic elastic modulus (E _ S _ 0) increases with the increase of confining pressure and consolidation ratio, while the maximum damping ratio 位 _ (max) decreases with the increase of confining pressure and consolidation ratio. Compared with silt, the dynamic strength and dynamic elastic modulus of tailing silt are obviously lower. The dynamic characteristics of two kinds of tailings are improved after mechanical compaction, and the effect of silt is more obvious.
【作者单位】： 重庆大学煤矿灾害动力学与控制国家重点实验室;重庆大学资源及环境科学学院;西南石油大学油气藏地质及开发工程国家重点实验室;东京大学土木工程系;
【基金】：国家自然科学基金资助项目(51304170,51404049)~~
【分类号】：TV649
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本文编号：1911980