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Three-dimensional DEM investigation of the stress-dilatancy relation of grain-cementing type methane hydrate-bearing sediment

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Petroleum 2021年第4期7卷 477-484页

作者： An Zhang Mingjing Jiang Wenhao Du School of Civil Engineering Suzhou University of Science and TechnologySuzhouJiangsu215009China Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering Ocean University of ChinaQingdao266000China State Key Laboratory for Disaster Reduction in Civil Engineering Tongji University Shanghai200092China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai200092China Department of Civil Engineering Tianjin UniversityTianjin300072China Tongji Architectural Design(Group)Co. Ltd.No.1230 Siping RoadShanghai200092China

In this study,the Discrete Element Method(DEM)was employed to investigate numerically the effects of hydrate cementation and intermediate principal stress on the stress-dilatancy relation of graincementing type methane hydrate-bearing sediment(MHBS)by conducting a series of conventional and true triaxial tests.A novel 3D thermo-hydro-mechanical-chemical(THMC)contact model for MHBS was employed.The numerical results show that with increasing hydrate saturation and back pressure,or decreasing confining pressure,temperature and salinity,the stress-dilation relation of grain-cementing type MHBS evolves from dilation-dominant to bond-dominant.For the clean sand samples,the relationship between the normalized stress ratio h/Mcr and the dilatancy rate d is close under different intermediate principal stress coefficients.However,for the MHBS samples,this relationship is still affected by the intermediate principal stress coefficient b,due to the effect of hydrate cementation.

关键词： stress-dilatancy Cementation Methane hydrate bearing sediment Discrete element method Intermediate principal stress

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Review of Proposed stress-dilatancy Relationships and Plastic Potential Functions for Uncemented and Cemented Sands

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Journal of Geological Research 2019年第2期1卷 19-34页

作者： Mojtaba Rahimi Department of Mechanical Engineering Khomeinishahr BranchIslamic Azad UniversityKhomeinishahr/IsfahanIran

stress-dilatancy relationship or plastic potential function are crucial components of every elastoplastic constitutive model developed for sand or cemented sand.This is because the associated flow rule usually does not produce acceptable outcomes for sand or cemented sand.Many formulas have been introduced based on the experimental observations in conventional and advanced plasticity models in order to capture ratio of plastic volumetric strain increment to plastic deviatoric strain increment(i.***.dilatancy rate).Lack of an article that gathers these formulas is clear in the literature.Thus,this paper is an attempt to summarize plastic potentials and specially stress-dilatancy relations so far proposed for constitutive modelling of cohesionless and cemented sands.stress-dilatancy relation is usually not the same under compression and extension conditions.Furthermore,it may also be different under loading and unloading conditions.Therefore,the focus in this paper mainly places on the proposed stress-dilatancy relations for compressive monotonic loading.Moreover because plastic potential function can be calculated by integration of stress-dilatancy relationship,more weight is allocated to stress-dilatancy relationship in this research.

关键词： stress-dilatancy Plastic potential function Flow rule dilatancy rate Plasticity Sand Cemented sand

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