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Pore water pressure model for sands reinforced with randomly distributed fibers based on cyclic triaxial tests
Soil Dynamics and Earthquake Engineering ( IF 4 ) Pub Date : 2021-05-23 , DOI: 10.1016/j.soildyn.2021.106812
Jinli Zhang , Zhuangyi Yang , Qing Yang , Gang Li , Jia Liu

In this study, the pore water pressure accumulation laws in sand reinforced with randomly distributed fibers was investigated through cyclic triaxial compression tests. The effects of relative density, cyclic stress ratio, fiber content, and fiber length were examined. The test results showed that reinforcing the sand with randomly distributed fibers effectively delayed the pore water pressure accumulation and significantly increased liquefaction resistance. When the test conditions remained unchanged, the pore water pressure accumulation rate of the fiber-reinforced sand decreased as the fiber length and fiber content increased, and reached the lowest when fiber content reached 0.6% and fiber length attained 12 mm. Whereas, the accumulation rate of fiber-reinforced sand increased as the cyclic stress ratio increased, and reached the highest when relative density reached 30%, followed by 50% and 70%. Based on the test results, a three-parameter pore water pressure model that accounts for the effects of fiber content, fiber length, relative density, cyclic stress ratio, and sand particle diameter was established, and a method for estimating the parameters a and b was recommended. The predictions agreed relatively well with the test results, suggesting that the model is applicable to analysis the pore water pressure development laws in fiber-reinforced sands.



中文翻译:

基于循环三轴试验的随机分布纤维增强砂的孔隙水压力模型

在这项研究中,通过循环三轴压缩试验研究了用随机分布的纤维增强的沙子中的孔隙水压力累积规律。检查了相对密度,循环应力比,纤维含量和纤维长度的影响。测试结果表明,用随机分布的纤维加固沙子可以有效地延迟孔隙水压力的积累,并显着提高抗液化性。当测试条件保持不变时,纤维增强砂的孔隙水压力累积率随纤维长度和纤维含量的增加而降低,当纤维含量达到0.6%且纤维长度达到12 mm时,其孔隙水压力累积率达到最低。纤维增强砂的堆积率随着循环应力比的增加而增加,相对密度达到30%时达到最高,其后分别为50%和70%。根据测试结果,建立了一个三参数孔隙水压力模型,该模型考虑了纤维含量,纤维长度,相对密度,循环应力比和砂粒直径的影响,并估算了参数建议使用ab。预测结果与试验结果相对吻合,表明该模型可用于分析纤维增强砂中孔隙水压力的发展规律。

更新日期:2021-05-24
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