Mechanical Properties of Tailings Sample with Different Moisture Contents under Dry and Wet Cycles
Mechanical Properties of Tailings Sample with Different Moisture Contents under Dry and Wet Cycles
复制标题
不同含水量尾矿样品干湿循环下的力学性能
DOI：
10.1155/2019/9079754
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发表时间：
2019-12
影响因子：
1.8
通讯作者：
Zhang Zhi-jun
中科院分区：
文献类型：
--
作者：
Wu Ling-ling;Guo Yao-hui;Tong Kai-wen;Hu Lin;Yu Qing;Zhang Zhi-jun
由于降水入渗、水分蒸发、湿润线升降等原因，尾矿长期处于周期性吸湿-除湿状态。尾矿在干湿循环过程中物理力学性质变化的机理关系到整个尾矿坝的安全运行。为探索湖南某尾矿库在不同初始含水率条件下尾矿力学行为随干湿循环次数的变化规律，对含水率分别为6.10%、10.40%、14.00%、18.20%、和21.00%的试样在自然干密度下进行0 ~ 6次吸放湿循环后，得到试样的应力-应变关系曲线、孔隙水压力、破坏模式、通过三轴固结不排水剪切试验，测试了试样的抗剪强度和抗剪强度。试验结果表明，随着吸放湿循环次数的增加，尾矿砂样的强度减弱，经过3 ~ 5次循环后强度趋于稳定。另外，含水量较低的试样应力-应变曲线急剧下降。而不同含水量的尾矿砂样在不同干湿循环下的孔隙水压力总体上都呈现先增大后减小的现象。
Due to precipitation infiltration, evaporation of water, and rising and falling of the wetting line, the tailings are in a cyclical moisture absorption-dehumidification state for a long time. The mechanism of change of physical and mechanical properties of tailings during the dry and wet cycle is related to the safe operation of the entire tailings dam. In order to explore the variation of the mechanical behavior of tailings in a tailings pond in Hunan Province with the number of dry and wet cycles under different initial water content conditions, the tailings sand samples with moisture content of 6.10%, 10.40%, 14.00%, 18.20%, and 21.00% were subjected to 0 to 6 times of moisture absorption and desorption cycles at natural dry density, and then, the stress-strain relationship curves, pore water pressure, failure mode, and shear dilatancy of these samples were tested by triaxial consolidation undrained shear test. The test results showed that when the number of moisture absorption and desorption cycles increases, the strength of the tailings sand sample was weakened, and the strength tended to be stable after 3∼5 cycles. In addition, the stress-strain curve of the sample with lower water content dropped sharply. However, the pore pressure of tailings sand samples with different water contents under different wet and dry cycles all showed a phenomenon of increasing first and then decreasing in general.
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DOI：
10.1017/cbo9781139207249.009
发表时间：
2012
期刊：
--
影响因子：
--
作者：
W. Marsden
通讯作者：
W. Marsden
DOI：
--
发表时间：
2010-01
期刊：
--
影响因子：
--
作者：
张芳枝;陈晓平
通讯作者：
张芳枝;陈晓平
影响因子：
9.9
作者：
F. Vaezi G.;R. S. Sanders;J. Masliyah
通讯作者：
F. Vaezi G.;R. S. Sanders;J. Masliyah
影响因子：
13.6
作者：
Rico, M.;Benito, G.;Diez-Herrero, A.
通讯作者：
Diez-Herrero, A.
影响因子：
15.1
作者：
Ofori, Philip;Nguyen, Anh V.;Ozdemir, Orhan
通讯作者：
Ozdemir, Orhan