冻融循环作用下尾矿坝的力学响应特征
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TU431

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国家自然科学基金(51504123);辽宁省自然科学基金(20170540417);辽宁省教育厅一般项目(LJYL029)


Study on mechanical response characteristics of tailings dam under freezing thawing cycle
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    摘要:

    寒区冻融环境条件下,尾矿砂的冻融、缩胀、损伤破坏给寒区尾矿坝工程造成极大的危害。为探究冻融循环作用下尾矿坝变形规律,揭示其变形机制。采用自主设计的尾矿坝相似模型试验装置,开展不同冻结温度(-5、-25、-45℃)条件下,尾矿坝的变形规律模型试验。借助土压力、激光位移、孔隙水压力传感器,采用动态数据采集仪采集相关数据,分析冻融循环过程中尾矿坝各关键位置应力、变形、孔隙水压力的动态变化规律。试验结果表明:坝体内应力随冻结温度的降低而增大,在冻融循环前期,尾矿坝各关键位置应力增长速度明显高于冻融循环其他阶段。坝体内孔隙水压力随冻结温度的降低而减小,坝体越深,孔隙水压力的变化幅度越大,周期性更强,也更具有规律性。冻结温度具有明显的位置效应,越靠近尾矿坝边缘,坝体变形量越大,变形速度越快。

    Abstract:

    The freezing and thawing, shrinkage and expansion, and damage of tailings sand can cause great harm to the project of tailing dam in cold regions. In order to explore the deformation characteristics of tailing dam and reveal its deformation mechanism under freeze-thawing, down-scale tailings dam model tests were carried out on a self-designed device under different freezing temperatures (-5, -25, -45℃). The soil pressure, displacement and pore water pressure at each key position of tailing dam during the freeze-thaw cycle were measured by the dynamic data acquisition instrument. The test results show that:the internal stress of the dam increases with decrease of freezing temperature; the stress growth rate in the early stage of freeze-thaw cycleat each key position is higher than that at the other stages. The pore water pressure in the dam decreases with decrease of freezing temperature. The variation range, periodicity and regularity of pore pressure increases with the position depth of the dam. Besides, it is revealed that the freezing temperature has obvious position effect. The closer to the tailings dam edge, the greater the deformation magnifude of dam body and the higher of the deformation rate.

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金佳旭,李世旺,梁冰,张二军,张平怡.冻融循环作用下尾矿坝的力学响应特征[J].土木与环境工程学报(中英文),2019,41(4):19-25.

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  • 收稿日期:2018-11-26
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  • 在线发布日期: 2019-07-27
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