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长期循环荷载下珊瑚砂累积变形特性试验研究

何绍衡, 刘志军, 夏唐代, 周红星, 于丙琪

何绍衡, 刘志军, 夏唐代, 周红星, 于丙琪. 长期循环荷载下珊瑚砂累积变形特性试验研究[J]. 岩土工程学报, 2019, 41(S2): 161-164. DOI: 10.11779/CJGE2019S2041
引用本文: 何绍衡, 刘志军, 夏唐代, 周红星, 于丙琪. 长期循环荷载下珊瑚砂累积变形特性试验研究[J]. 岩土工程学报, 2019, 41(S2): 161-164. DOI: 10.11779/CJGE2019S2041
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HE Shao-heng, LIU Zhi-jun, XIA Tang-dai, ZHOU Hong-xing, YU Bing-qi. Experimental study on cumulative deformation characteristics of coral sand under long-term cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S2): 161-164. DOI: 10.11779/CJGE2019S2041
Citation: HE Shao-heng, LIU Zhi-jun, XIA Tang-dai, ZHOU Hong-xing, YU Bing-qi. Experimental study on cumulative deformation characteristics of coral sand under long-term cyclic loading[J]. Chinese Journal of Geotechnical Engineering, 2019, 41(S2): 161-164. DOI: 10.11779/CJGE2019S2041
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长期循环荷载下珊瑚砂累积变形特性试验研究  English Version

  • 1. 浙江大学滨海和城市岩土工程研究中心,浙江 杭州 310058;
    2.中交交通基础工程环保与安全重点实验室,广东 广州 510230

基金项目: 国家自然科学基金项目（51208294,51378463）; 中央高校基本科研业务费专项资金资助项目（2018QNA4033）
详细信息
    作者简介:

    何绍衡(1995— ),男,博士研究生,主要从事珊瑚砂静动力特性方面的研究。E-mail: heshaoheng@zju.edu.cn。

    通讯作者:

    何绍衡，E-mail：heshaoheng@zju.edu.cn

Experimental study on cumulative deformation characteristics of coral sand under long-term cyclic loading

  • 1. Research Center of Costal and Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;
    2. CCCC Key Lab of Environmental Protection & Safety in Foundation Engineering of Transportation, Guangzhou 510230, China;

摘要

    摘要
  • 摘要: 对取自南海的珊瑚砂进行等向和K0固结的三轴排水剪切试验,发现固结路径对珊瑚砂的剪切行为有显著影响。在此基础上,采用K0固结条件,设计一系列不同围压和循环动应力比的长期排水循环加载三轴试验,研究得到珊瑚砂具有门槛颗粒破碎循环动应力比,安定性理论可用于解释不同动应力比长期循环加载下珊瑚砂的累积变形发展模式。基于静力和动力试验结果,引入相对偏应力水平,建立能反映初始固结状态和循环动应力比的珊瑚砂排水循环加载轴向残余累积应变显式计算模型,对预测循环荷载下珊瑚砂地基长期沉降有积极意义。
    Abstract: The drained triaxial shear tests on isotropic and K0 consolidation of coral sand samples taken from the South China Sea reveal that the consolidation path has a significant effect on the strength characteristics of the coral sand. On this basis, using the K0 consolidation condition, a series of long-term drained cycle triaxial tests with different confining pressures and cyclic dynamic stress ratios are carried out. The results show that the coral sand has a threshold cyclic dynamic stress ratio, which makes its particles obviously broken. The stability theory can be used to explain the cumulative deformation development patterns of the coral sand under long-term cyclic loading with different dynamic stress ratios. Based on the results of static and dynamic test results, the relative deviator stress level is introduced to establish an explicit model for the axial residual cumulative deformation of the coral sand, which can reflect the initial consolidation state and cyclic dynamic stress ratio of the coral sand under drained cyclic loading. The proposed model is of positive significance for predicting the long-term settlement of the coral sand foundation under cyclic loading.
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    • 参考文献(7)
  • [1] 王刚, 查京京, 魏星. 循环三轴应力路径下钙质砂颗粒破碎演化规律[J]. 岩土工程学报, 2019: 1-6.
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    [5] 何绍衡, 郑晴晴, 夏唐代, 等. 考虑时间间歇效应的地铁列车荷载下海相软土长期动力特性试验研究[J]. 岩石力学与工程学报, 2019, 38(2): 353-364.
    (HE Shao-heng, ZHENG Qing-qing, XIA Tang-dai, et al.Experimental study on long-term dynamic characteristics of marine soft soils under metro train loads considering time intermittent effect[J]. Chinese Journal of Rock Mechanics and Engineering, 2019, 38(2): 353-364. (in Chinese))
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    (WU Ting-yu, GUO Lin, CAI Yuan-qiang, et al.Deformation behavior of K0-consolidated soft clay under traffic load-induced stress paths[J]. Chinese Journal of Geotechnical Engineering, 2017, 39(5): 859-867. (in Chinese))
    [7] 姚兆明, 黄茂松. 循环荷载下饱和软黏土的累积变形显式模型[J]. 岩土工程学报, 2011, 33(3): 325-331.
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出版历程
  • 收稿日期:  2019-04-27
  • 发布日期:  2019-07-19

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