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Volume 36 Issue 9
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JIANG Ming-jing, PENG Di, SHEN Zhi-fu, ZHANG Wang-cheng, ZHU Fang-yuan. DEM analysis on formation of shear band of methane hydrate bearing soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1624-1630. DOI: 10.11779/CJGE201409008
Citation: JIANG Ming-jing, PENG Di, SHEN Zhi-fu, ZHANG Wang-cheng, ZHU Fang-yuan. DEM analysis on formation of shear band of methane hydrate bearing soils[J]. Chinese Journal of Geotechnical Engineering, 2014, 36(9): 1624-1630. DOI: 10.11779/CJGE201409008
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DEM analysis on formation of shear band of methane hydrate bearing soils

  • 1. Deptartment of Geotechnical Engineering, Tongji University, Shanghai 200092, China;
    2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;
    3. State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China

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  • Received Date: February 11, 2014
  • Published Date: September 21, 2014
    Graphical Abstract
    • Abstract
  • Methane hydrate (MH) decomposition and mining will worsen the mechanical behavior of methane hydrate bearing soil (MHBS) and cause a series of geotechnical problems. Therefore, in order to facilitate safe exploitation of MH, it is crucial to understand the strength and deformation characteristics of MHBS. Based on the bond model of MHBS, the distinct element method (DEM) is used in planar biaxial compression tests to analyze the formation of shear band as well as some micro and macro variables of MHBS within and outside the shear band. The results show that methane hydrate increases the strength of MHBS and leads to strain-softening behavior; the shear band is fully developed after the peak stress, accompanied by massive bond breakage and localization of other micro variables; the micro and macro variables within and outside the shear band differ. Besides, with the increase of axial strain, the micro structure of MHBS changes.
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    • References (17)
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