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针对孔隙填充型水合物的赋存形态,提出了一种新的制备孔隙填充型能源土试样的数值成样方法.孔隙填充型水合物的砂性能源土试样是由砂粒和水合物颗粒混合而成的特殊的散粒体材料,具有明显的非连续特征.在土骨架的孔隙中,将水合物块体视为由颗粒通过强胶结作用凝聚而成的团簇整体,随机填充生成不同水合物饱和度的沉积物试样,开展能源土宏观力学特性的离散元固结排水三轴压缩试验模拟,并从应力应变、体变、接触组构等方面进行分析.结果表明,水合物饱和度的增大对低饱和度的孔隙填充型能源土试样的初始弹性模量和强度影响较小.有效围压相同时,孔隙填充型能源土试样的体积剪缩量随着水合物饱和度的增大而减小;而水合物饱和度相同时,能源土试样强度及体积剪缩量随着有效围压的增大而增大.能源土试样的剪胀角随有效围压的增大而近似线性减少,随水合物饱和度的增大而趋于线性增大.颗粒间接触方向随着轴向应变的增大而朝竖直方向偏转.
Aiming at the occurrence mode of pore-filled hydrate, a new method for preparing sample of pore-filled energy source soil is proposed.The sand-filled energy soil sample of pore-filled hydrate is composed of sand and hydrate particles Mixed special granule material, with obvious non-continuous features in the soil skeleton of the pores, the hydrate blocks as aggregates of particles formed by the strong agglomeration of aggregates, randomly filled to generate different Hydrate saturation sediment sample, carry out triaxial compression test of discrete element consolidation drainage of macroscopic mechanical properties of energy source soil, and analyze from the aspects of stress and strain, volume change and contact structure.The results show that hydrate saturation The increase of degree has little effect on the initial elastic modulus and strength of low-saturation pore-filled energy soil samples.When the effective confining pressure is the same, the volumetric shrinkage of pore-filled energy soil samples increases with the hydrate saturation While the hydrate saturation is the same, the strength and volumetric shear strength of the energy soil increases with the increase of the effective confining pressure.The dilatancy angle of the energy soil sample increases with the effective confining pressure Increase and approximate Of reduction, it tends to increase linearly with an increase in saturation hydrate. Interparticle contact direction with increasing axial strain is deflected toward the vertical direction.