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Coupled CFD-DEM method for undrained biaxial shear test of methane hydrate bearing sediments

机译：CFD-DEM耦合方法用于含甲烷水合物沉积物的不排水双轴剪切试验

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摘要

Methane hydrate (MH), a potential source of future energy, is extensively deposited in marine sediments. It is essential to understand the mechanical properties of methane hydrate bearing sediments (MHBS) for applications relevant to mining and geotechnical engineering. This study aims to investigate the undrained shear strength of MHBS through coupled computational fluid dynamics and discrete element method (CFD–DEM) numerical approach. The Tait’s fluid state equation is implemented into the Navier–Stokes equation-based CFD, while the DEM is used to model granular particle system of MHBS. The CFD–DEM tool is first verified by two typical geomechanics problems where analytical solutions are available. The simulations show that the stress–strain behavior of MHBS depends on temperature, back pressure and MH saturation, as observed in reported experimental results. The presence of MH alters the hardening response of clean sand into softening response due to the bonding effects of MH. The friction angles and cohesions described by total stress and effective stress both increase as the back pressure and MH saturation increase or the temperature drops. There is significant localization in MH bond breakage events but no localization effect is observed in fluid flow and excess pore pressure distribution. This is because fluid is mostly controlled by the boundary conditions instead of specific fluid–particle interactions locally in the simulated quasi-static loading.
机译：甲烷水合物（MH）是一种潜在的未来能源，广泛沉积在海洋沉积物中。对于与采矿和岩土工程有关的应用，必须了解含甲烷水合物的沉积物（MHBS）的机械性能。本研究旨在通过耦合计算流体动力学和离散元方法（CFD–DEM）数值方法研究MHBS的不排水剪切强度。 Tait的流体状态方程式已在基于Navier-Stokes方程的CFD中实现，而DEM用于建模MHBS的颗粒系统。 CFD–DEM工具首先通过两个典型的地质力学问题进行了验证，这些问题可以使用分析解决方案。仿真表明，如报道的实验结果所示，MHBS的应力-应变行为取决于温度，背压和MH饱和度。 MH的存在由于MH的结合作用而将清洁砂的硬化反应转变为软化反应。总应力和有效应力所描述的摩擦角和内聚力都随着背压和MH饱和度的增加或温度的降低而增加。在MH键断裂事件中存在明显的局部化，但在流体流动和过大的孔隙压力分布中未观察到局部化作用。这是因为在模拟准静态载荷中，流体主要由边界条件控制，而不是局部由特定的流体-粒子相互作用控制。

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  • 来源
    《Granular matter》 |2018年第4期|63.1-63.10|共17页
  • 作者

    Mingjing Jiang; Zhifu Shen; Wei Zhou; Marcos Arroyo; Wangcheng Zhang;

  • 作者单位

    Department of Civil Engineering Tianjin University|State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University|Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University|Department of Geotechnical Engineering College of Civil Engineering Tongji University;

    Institute of Geotechnical Engineering Nanjing Tech University;

    State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University|Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education Tongji University|Department of Geotechnical Engineering College of Civil Engineering Tongji University;

    Department of Geotechnical Engineering and Geosciences Universitat Politècnica de Catalunya;

  • 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; Undrained shear test; Coupled CFD–DEM method; Excess pore pressure;

    机译：含甲烷水合物的沉积物;不排水的剪切试验;CFD-DEM耦合方法;孔隙压力过大;

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