| 砂-粉混合料剪切波速的弯曲元及共振柱试验对比试验研究 |
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| 引用本文： | 景亮,吴琪,方怡.砂-粉混合料剪切波速的弯曲元及共振柱试验对比试验研究[J].震灾防御技术,2020,15(4):696-707. |
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| 作者姓名： | 景亮 吴琪 方怡 |
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| 作者单位： | 1.宁波市轨道交通集团有限公司, 浙江宁波 315000 |
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| 基金项目： | 中央级公益性科研院所基本科研业务专项（ZDJ2018-11） |
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| 摘 要： | 为探讨测试方法、试验条件以及级配特征对砂-粉混合料剪切波速的影响,对具有不同细粒含量FC,相对密度Dr以及初始有效围压$\sigma_{3 \mathrm{c}}^{\prime}$的砂-粉混合料进行弯曲元和共振柱试验。结果表明:当Dr =35%或50%时,剪切波速Vs随FC的增大先减小后增大;当Dr =60%时,Vs随FC的增大而减小;弯曲元试验测得的Vs明显大于共振柱试验测得的Vs,随着FC的增大,弯曲元试验与共振试验得到的Vs差值逐渐减小,而当FC＞20%时,两种试验得到的Vs基本相同。在考虑Vs弥散性之后,不同FC的混合料弯曲元与共振柱试验得到的Vs结果具有较好的一致性。基于Hardin模型建立的砂-粉混合料Vs预测方法具有较好的预测效果。
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| 关 键 词： | 剪切波速 弯曲元试验 共振柱试验 剪切波弥散性 |
| 收稿时间： | 2020/5/14 0:00:00 |
Measurement of Shear Wave Velocity of Sand-Silt Mixtures by Bender Element and Resonant Column Tests |
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| Jing Liang,Wu Qi,Fang Yi.Measurement of Shear Wave Velocity of Sand-Silt Mixtures by Bender Element and Resonant Column Tests[J].Technology for Earthquake Disaster Prevention,2020,15(4):696-707. |
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| Authors: | Jing Liang Wu Qi Fang Yi |
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| Institution: | 1.Ningbo Rail Transit Group Co., Ltd., Ningbo 315000, Zhejiang, China2.Institute of Geotechnical Engineering, Nanjing Tech University, Nanjing 210009, China3.National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing 100085, China |
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| Abstract: | In order to investigate the influence of test method, test conditions and grain size distributions on shear wave velocity of sand-silt mixtures, a series of bender element and resonant column tests were performed on the mixtures with different fines content FC, relative density Dr and initial effective pressure σ''3c. The test results show that when Dr=35% or 50%, Vs decreases first and then increases with FC increasing, and when Dr=60%, Vs decreases with the increase of FC. The Vs measured by the bender element test are larger than that measured by the resonance column test, the difference is gradually reduced with FC increasing, and the Vs obtained by the two tests are basically the same when FC>20%. Based on the theory of Biot two-phase elastic wave propagation, considering the dispersion of shear wave, the shear wave velocity of bending elements of different fine content mixtures are in good agreement with the results of resonant column tests. The Vs prediction method of sand-silt mixture based on Hardin model shows a good prediction effect. |
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| Keywords: | Shear wave velocity Bender element test Resonant column test Dispersion of shear wave |
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