| 陈敬松,张家生,孙希望.饱和尾矿砂动强度特性试验结果与分析[J].水利学报,2006,37(5):603-607 |
| 饱和尾矿砂动强度特性试验结果与分析 |
| Experimental study on dynamic strength of saturated tailings |
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| DOI： |
| 中文关键词: 动三轴试验 动剪应力比 固结应力比 固结围压 抗震性能 |
| 英文关键词: saturated tailings dynamic triaxial test cyclic stress ratio consolidated stress ratio confining pressure aseismic resistance |
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| 中文摘要: |
| 本文通过对饱和尾矿砂的动三轴液化试验，研究了尾矿砂在往返加荷条件下的动强度特性。对试验结果进行分析可得：动应力幅值对试样的轴向动应变影响显著；动剪应力随固结围压增加而增加，但固结围压对动剪应力比的影响不大；固结应力比对饱和砂土液化或动强度的影响不是单一的增大或减小，在同一密度、同一固结围压条件下均显示出固结应力比为1.5时的动剪应力比大于固结应力比为1.0和2.0时的动剪应力比；密度对尾粉砂的抗液化强度影响很大，因此可以通过提高尾矿料的密实度来增大尾矿坝的抗震性能。 |
| 英文摘要: |
| The dynamic characteristics of saturated tailings under cyclic loading are studied by triaxial tests. The results show that the dynamic stress level has strong effect on dynamic axial strain. The dynamic strength of saturated tailings increases with the confining pressure, but the confining pressure has little effect on cyclic stress ratio. The dynamic strength of tailings is not only simply increases or decreases with consolidated stress ratio. When the consolidated stress ratio is equal to 1.5 the cyclic stress ratio is higher than that of the ratio equal to 1.0 or 2.0. The density has important effect on the resistance of liquefaction characteristics of tailings, so that the enhancement of density of tailings dam can greatly improve its aseismic capability. |
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