纤维加筋黄土的三轴蠕变试验研究
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P642.3

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国家重点研发计划 2017YFC0504703


Experimental Study on Three Axis Creep of Fiber Reinforced Loess
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National Key R&D Program of China 2017YFC0504703

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    摘要:

    本文进行了纤维加筋黄土的三轴固结排水蠕变试验,通过对初始含水率、加筋率和围压的不同控制,分析了加筋黄土的蠕变特性,得到了以下几点结论:在黄土中掺入玄武岩纤维可以有效改善黄土试样的蠕变情况,蠕变变形的抑制效果与加筋率没有明显单调关系,存在最优加筋率;随着含水率的升高,加筋土的蠕变变形增大,加筋效果降低,偏应力越大该现象越明显;随着围压的增大,加筋黄土的蠕变变形降低,加筋效果增大,偏应力越大,该现象越明显;以Mesri蠕变模型为基准,对试验曲线进行模拟,计算出模型各参数,经验证,纤维加筋黄土的三轴蠕变特性可以用Mesri模型拟合。

    Abstract:

    The triaxial consolidation drainage creep test of fiber reinforced loess is carried out. Through the different control of initial moisture content, reinforcement rate and confining pressure, the creep characteristics of reinforced loess are analyzed, and the following conclusions are obtained: adding basalt fiber into loess can effectively improve the creep of loess samples, and the restraining effect of creep deformation has no obvious monotonous relationship with reinforcement rate, there is an optimal reinforcement ratio; with the increase of water content, the creep deformation of reinforced soil increases, the reinforcement effect decreases, and the larger the partial stress is, the more obvious the phenomenon is; with the increase of confining pressure, the creep deformation of reinforced loess decreases, the reinforcement effect increases, and the larger the partial stress is, the more obvious the phenomenon is; based on the Mesri creep model, the test curve is simulated, and the parameters of the model are calculated. The triaxial creep characteristics of fiber reinforced loess can be fitted by Mesri model.

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汪国刚,骆亚生,李沛达,等. 纤维加筋黄土的三轴蠕变试验研究[J]. 科学技术与工程, 2020, 20(19): 7602-7608.
Wang Guogang, Luo Yasheng, Li Peida, et al. Experimental Study on Three Axis Creep of Fiber Reinforced Loess[J]. Science Technology and Engineering,2020,20(19):7602-7608.

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  • 收稿日期:2020-01-18
  • 最后修改日期:2020-06-23
  • 录用日期:2020-02-21
  • 在线发布日期: 2020-07-28
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