中文摘要：

利用自主研发的水合物合成与分解一体化三轴实验装置,以中细砂作为水合物赋存介质,在不同有效围压（1 MPa、2 MPa、4 MPa）条件下,对不同水合物饱和度（0%、13.3%、26.6%、39.9%）的松散沉积物进行三轴剪切实验,探讨了水合物饱和度和有效围压对沉积物应力应变曲线形态及不同抗剪强度指标的影响规律,得到不同强度参数的经验模型。结果表明：含甲烷水合物非固结沉积物的应力应变曲线形态是水合物饱和度和有效围压共同作用的结果;抗剪强度、起始屈服强度与水合物饱和度有关,而受温度和有效围压的影响较小;黏聚力和内摩擦角随水合物饱和度的增大而增大。

英文摘要：

A series of triaxial shearing tests of the unconsolidated medium-fine hydrate-bearing sediments with different hydrate saturation（ 0%,13. 3%,26. 6% and 39. 9%） were finished using self-made three-axis experimental device for the synthesis and decomposition of hydrate under different effective confining pressure（ 1MPa,2MPa,4MPa）,the test purpose is to investigate the effects of hydrate saturation and effective confining pressure on the stress-strain curve and shear strength indexes of the sediments,and the empirical models for calculating the triaxial shearing strength indexes of the sediments were obtained. It is shown that the shape of the stress-strain curve of the hydrate-bearing sediments is controlled by the effective confining pressure and the hydrate saturation; the shear strength and initial yielding strength of the hydrate-bearing sediments are related to the saturation of hydrate,while temperature and confining pressure have a little impact on them; the cohesion and internal friction angle of the sediments increase with the increase of hydrate saturation.