| 刘俊新,袁槐岑,张超,张建新,刘育田,王光进.高应力条件下循环球-偏应力耦合作用对饱和尾粉砂动力特性影响分析[J].水利学报,2021,52(11):1295-1308 |
| 高应力条件下循环球-偏应力耦合作用对饱和尾粉砂动力特性影响分析 |
| Analysis of the effect of cyclic spherical-deviatoric stress coupled with dynamic characteristics of saturated tail sand under high-stress conditions |
| 投稿时间：2021-05-11 |
| DOI：10.13243/j.cnki.slxb.20210431 |
| 中文关键词: 高应力 循环球应力 循环偏应力 耦合作用 尾粉砂 |
| 英文关键词: high stress cyclic spherical stress cyclic deviatoric stress coupling effect tailing sand |
| 基金项目:“十三五”国家重点研发计划项目（2017YFC0804600） |
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| 中文摘要: |
| 受地震作用影响，细粒化高堆尾矿的潜在安全隐患愈加突出。为了探究地震荷载作用对饱和尾粉砂动力特性的影响规律，开展了一系列的循环球应力与循环偏应力的动三轴试验来模拟地震荷载产生的复杂应力条件。系统地研究了在高应力条件下循环球-偏应力耦合作用对饱和尾粉砂累积孔压和累积塑性应变的发展特性。试验结果表明：在单纯循环球应力作用下，饱和尾粉砂产生的累积孔压不足以引起试样发生破坏；与单纯循环偏应力相比，循环球-偏应力的耦合会抑制累积孔压与累积塑性应变的发展。通过对试验结果的分析，建立了满足高应力条件下的饱和尾粉砂累积孔压耦合经验增长模型；同时，并从有效应力路径、颗粒破碎和塑性应变机理的角度揭示了循环球-偏应力的耦合机制。这些研究可为我国的细粒化高堆尾矿坝的抗震研究提供一定的参考。 |
| 英文摘要: |
| Affected by earthquakes, the potential safety hazards of fine-grained and high-stacked tailings more prominent. A series of dynamic triaxial tests of cyclic spherical stress and cyclic deviatoric stress was carried out to explore the influence of seismic loads on the dynamic properties of saturated silt tail, simulating the complex stress conditions caused by seismic loads. The test results show that:Under pure cyclic spherical stress, the accumulated pore pressure generated by saturated tailing silt is not enough to cause damage to the sample; Compared with pure cyclic deviatoric stress, the coupling of cyclic spherical-deviatoric stress can inhibit the development of cumulative pore pressure and cumulative plastic strain. Meanwhile, through the analysis of the test results, an empirical growth model of pore pressure coupling for saturated tailings under high-stress conditions is established. And the coupling mechanism of cyclic spherical-deviatoric stress is revealed from the effective stress path、particle breakage and plastic strain mechanism. These studies can provide a sure reference for the seismic research of fine-grained and high-stacked tailings dam in china. |
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