摘要
由于不同粒径颗粒沉积速度不同,尾矿库尾矿沉积分选后,随着距离尾矿库滩顶长度增大,细粒含量不断增多。为探讨细粒含量对尾矿砂动力特性的影响,对不同细粒含量的尾矿砂进行固结不排水振动三轴试验,试验围压为100kPa。试验结果表明,尾矿砂具有统计意义上的自相似性,分维值为2~3,随细粒含量增大,尾矿砂颗粒粒度分布由不均匀到均匀再到不均匀;随细粒含量增多,在相同振次条件下,尾矿砂动剪应力比先减小后增大,振次比相同时,孔压比的增长量先减小后增大,临界细粒含量为27.8%左右。
As different particle sizes had various deposition rates, the fine content of tailings after sediment gradually increased with the increasing distance from the top of the tailings pond. To research the influence of fine content on the dynamic charac- teristics of the tailings, consolidation undrained dynamic triaxial test was conducted on tailings sand with different fine con- tents, and the confining pressure was 100 kPa. The experimental results showed that the tailings sand had a statistical self sim- ilarity, the fractal dimension value was 2~3, and the particle size distribution of tailings sand changed from uneven to uniform and then uneven, with the fine content enlarging. The dynamic shear stress ratio of tailings sand decreased first and then in- creased, when the fine content grew and the vibrations were the same. Under the same vibration ratios, the pore pressure ratio first dropped and then increased, as well as the critical fine content was about 27.8%.
出处
《矿业研究与开发》
CAS
北大核心
2017年第2期70-73,共4页
Mining Research and Development
基金
河南省科技厅计划项目(132102210023)
关键词
细粒含量
尾矿砂
动强度
动孔压
Fine content, Tailings sand, Dynamic strength, Dynamic pore pressure
