小打鹅尾矿库筑坝尾矿的动力学特性试验研究

doi:10.13722/j.cnki.jrme.2016.0177

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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t_d/s_3c归一性均较好。破坏时的动孔隙水压力比μ_d/s_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j_d随破坏振次N_f的增加而降低，有效动内摩擦角j¢_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l_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。

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	尹光志1
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	王文松1
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	曹冠森1
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	张千贵1
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	陈宇龙4

关键词 ：采矿工程, 尾矿, 动三轴试验, 动强度, 动孔隙水压力, 动弹性模量, 阻尼比

Abstract：

A dynamic triaxial test of tailing slity sand and silt was conducted in order to investigate the dynamic characteristics of Xiaodae tailings and compare the different behaviors of these two tailings. The main experimental conditions consider natural consolidation and mechanical compaction. To make the research results more convincing，the particle size distribution and micro morphology of the tailings were both tested in detail. The results demonstrate that：the clay particles of tailings with less clay mineral cannot enhance dynamic strength. The dynamic shear stress ratio t_d/s_3c under different confining stresses can be normalized well. The increase of dynamic pore water pressure is influenced by vibration time primarily rather than magnitude of dynamic stress. The dynamic internal friction angle j_d decreases with the increase of failure vibration time，and the dynamic effective internal friction angle j_d is ruled by the increase of dynamic pore water pressure. The maximum dynamic elastic modulus E_d0 increases with the increase of confining pressure or consolidation ratio，whereas the maximum damping ratio l_max changes oppositely with these two factors. In contrast to tailing slit sand，tailing silt has the lower dynamic strength and dynamic elastic modulus. The mechanical compaction is more effective for tailing silt，which is beneficial to the dynamic characteristics of both tailings.

Key words： mining engineering tailings dynamic triaxial test dynamic strength dynamic pore water pressure dynamic elastic modulus damping ratio

引用本文:

尹光志1，2，王文松1，2，魏作安1，2，曹冠森1，2，张千贵1，3，陈宇龙4. 小打鹅尾矿库筑坝尾矿的动力学特性试验研究[J]. 岩石力学与工程学报, 2017, 36(S1): 3121-3130.
YIN Guangzhi1，2，WANG Wensong1，2，WEI Zuoan1，2，CAO Guansen1，2，ZHANG Qiangui1，3，CHEN Yulong4. Experimental study on the dynamic characteristics of embankment tailings from Xiaodae tailings pond. , 2017, 36(S1): 3121-3130.

链接本文:

https://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2016.0177 或 https://rockmech.whrsm.ac.cn/CN/Y2017/V36/IS1/3121

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