粘弹塑性土工格栅加筋尾矿流变模型研究
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TU431

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国家自然科学基金(51774163);辽宁省教育厅科研基金(LJYL054);鞍钢科研项目(2018~科A19)


Research on rheological model of tailings reinforced by viscoelasto-plastic geogrids
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    摘要:

    分析土工格栅工程力学特性对加筋尾矿结构变形和长期稳定的影响,基于四参数粘弹塑性模型表征土工格栅长期低应力作用下的力学特性,提出了土工格栅加筋尾矿的流变模型,把加筋复合体受力分析分为两个阶段,分别对应尾矿处于弹性状态和塑性状态,将尾矿产生塑性变形的时间(塑性到达时间)作为两个阶段分界点,并给出了两个阶段的加筋复合体本构关系表达式。研究表明:四参数粘弹塑性模型能够准确反映土工格栅的衰减型蠕变和应力松弛特征;第1阶段,筋材中的应力随时间减小,导致尾矿中的微观应力重新分布,直到尾矿达到屈服条件进入第2阶段,筋材的应力开始保持不变,加筋复合体整体应变由于筋材的蠕变而增加;加筋复合体受力快速由第1阶段过渡到第2阶段,第1阶段变形很小,复合体整体应变主要由第2阶段导致;塑性到达时间受到土工格栅模型参数中Kelvin系数和尾矿强度参数内摩擦角的影响显著。

    Abstract:

    In order to investigate the influence of mechanical properties of geogrids on the deformation and long-term stability of reinforced tailings, a rheological model for tailings reinforced by geogrids has been proposed based on the viscoelasto-plastic model with four parameters for mechanical properties of geogrids under long-term low stress loading condition. In this model, the force analysis of reinforced complexus is divided into two stages, i.e., the elastic and plastic states. The time point when plastic deformation (plastic arrival time) occurs is taken as the dividing point of two stages, and then the constitutive relations of the two stages of reinforced complex are put forward. Results show that the viscoelasto-plastic model with four parameters can accurately reflect attenuated creep and stress relaxation characteristics of geogrids. In the first stage, the stress of geogrids decreases with time, leading to the redistribution of micro-stress in tailings. This continues until the tailing yields and moves into the second stage. In this stage, the overall strain of reinforced composite increases as a result of creep of geogrids. The force of reinforced composite soon changes from first stage to second stage and the overall strain is mainly caused by the second stage. The plastic arrival time is significantly influenced by the Kelvin coefficient of geogrids model parameters and the internal friction angle.

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易富,杜常博,李军,张利阳,张晋.粘弹塑性土工格栅加筋尾矿流变模型研究[J].土木与环境工程学报(中英文),2019,41(6):52-60.

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  • 收稿日期:2019-05-25
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  • 在线发布日期: 2019-12-12
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