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水合物沉积物力学特性研究是天然气水合物开采领域中的热点问题。为深入了解水合物对沉积物力学特性的影响,在提出一个新的水合物沉积物离散元数值试样制备方法的基础上,模拟了不同水合物饱和度沉积物试样的三轴排水试验,并从其应力-应变关系、体变特性、弹性模量及峰值强度等方面对模拟结果及已有室内三轴试验结果进行了对比,然后利用该方法对具有不同微观胶结参数的水合物沉积物样进行了三轴离散元数值试验。研究结果表明:所提出的离散元模拟方法能较好地反映水合物沉积物的主要力学特性;天然气水合物与土颗粒间胶结性能的改变会对水合物沉积物的力学响应产生一定的影响;水合物沉积物强度和模量的增加是孔隙填充水合物和粒间胶结水合物共同作用的结果。
The study of hydrate sediment mechanical properties is a hot issue in the field of gas hydrate mining. In order to understand the effect of hydrate on the mechanical properties of sediments, a new hydrate sediment discrete element numerical sample preparation method based on the simulation of the different hydrate saturation sediment samples triaxial drainage test, The simulation results and the existing indoor triaxial test results are compared from the aspects of stress-strain relationship, bulk change property, elastic modulus and peak strength. Then the hydrate deposits with different micro-cementation parameters A three-axis discrete element numerical test was performed. The results show that the proposed discrete element simulation method can well reflect the main mechanical properties of hydrate sediments; the change of the cementation property between hydrate and soil particles will have some influence on the mechanical response of hydrate sediments; The increase in hydrate sediment strength and modulus is a result of the combined action of pore-filled hydrate and intergranular cementitious hydrate.