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A simple distinct element modeling of the mechanical behavior of methane hydrate-bearing sediments in deep seabed

机译：深海海底含甲烷水合物沉积物力学行为的简单不同要素建模

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摘要

The study on the mechanical behavior of methane hydrate-bearing sediments (HBS) in deep seabed is of great significance for the safe exploitation of methane hydrate in the future. Recent studies have shown that the mechanical behavior of HBS is significantly influenced by methane hydrate since it leads to cementation among soil grains. For better understanding its microscopic mechanical mechanism, this paper presents a simple numerical model of HBS using the distinct element method (DEM). First, a set of tests on two bonded aluminum rods were performed under different loading paths with a specially designed apparatus. Then, a simple bond contact model was proposed based on the experimental data and implemented into our two-dimensional DEM code, NS2D. Finally, a series of drained biaxial compression tests under different confining stresses on HBS samples with different bond strengths, which are used to represent different methane hydrate saturations (Smh), were carried out with this code. By comparing the results of numerical simulations with the experimental data obtained from triaxial compression tests, the study shows that the DEM incorporating the new bond contact model is capable of capturing the main mechanical characteristics of HBS such as the strain softening and dilation. And it can also capture that (a) the peak shear strength increases as Smh or the confining stress increases, while the dilation increases as Smh increases or the confining stress decreases; (b) both the cohesion and friction angle increase with the increasing of Smh. but the influence of Smh on the cohesion is much more significant than on the friction angle.
机译：研究深海海底含甲烷水合物沉积物（HBS）的力学行为，对今后安全开采甲烷水合物具有重要意义。最近的研究表明，HBS的机械性能受甲烷水合物的影响很大，因为它会导致土壤颗粒之间的胶结。为了更好地了解其微观力学机理，本文使用独特元素方法（DEM）提出了一个简单的HBS数值模型。首先，使用专门设计的设备在不同的加载路径下对两个铝制粘合棒进行了一组测试。然后，基于实验数据，提出了一个简单的键接触模型，并将其实现到我们的二维DEM代码NS2D中。最后，使用此代码对具有不同结合强度的HBS样品在不同的限制应力下进行了一系列排水双轴压缩试验，这些试验用来表示不同的甲烷水合物饱和度（Smh）。通过将数值模拟的结果与从三轴压缩测试获得的实验数据进行比较，研究表明，结合了新的粘结接触模型的DEM能够捕获HBS的主要机械特性，例如应变软化和膨胀。并且还可以捕获到：（a）峰值剪切强度随着Smh或围压的增加而增加，而膨胀随着Smh的增加或围压的减小而增加； （b）内聚力和摩擦角均随Smh的增加而增加。但是Smh对内聚力的影响远大于对摩擦角的影响。

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  • 来源
    《Granular matter》 |2013年第2期|209-220|共12页
  • 作者

    M. J. Jiang; Y. G. Sun; Q. J. Yang;

  • 作者单位

    Department of Geotechnical Engineering,College of Civil Engineering, Tongji University,1239 Siping Road, Shanghai 200092, China,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China;

    Department of Geotechnical Engineering,College of Civil Engineering, Tongji University,1239 Siping Road, Shanghai 200092, China,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China;

    Department of Geotechnical Engineering,College of Civil Engineering, Tongji University,1239 Siping Road, Shanghai 200092, China,Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    methane hydrate-bearing sediments; mechanical properties; cementation; contact behaviour; distinct element method;

    机译：含甲烷水合物沉积物;力学性能;胶结;接触行为;区别元法;

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