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针对南海原状土力学性质的研究对于南海油气资源开发具有重要意义。对南海陆坡区所取的软土试样,通过物理试验和X-射线衍射试验,分析了该土样的物化特性;通过一维固结试验和常规三轴压缩试验,探究了该原状土的压缩及剪切特性;借助扫描电子显微镜,分析了土体的微观结构特征。试验结果显示:该土体为高液限粉土,具有高含水率、高孔隙比和高饱和度的特点;土体的黏土矿物中伊利石含量最高,其胶体活动指数高;土体为欠固结土,在固结试验中表现出一定的结构性,在剪切试验中呈现应变硬化特征;土体微观上呈开放式的絮凝结构,骨架松散,颗粒定向度较低。
The research on the mechanical properties of undisturbed soil in the South China Sea is of great significance to the exploitation of oil and gas resources in the South China Sea. The physical and chemical properties of the soft soil samples taken from the South China Sea slope were analyzed by physical experiments and X-ray diffraction tests. By one-dimensional consolidation tests and conventional triaxial compression tests, Compressive and shear properties of the soil. The microstructure of the soil was analyzed by scanning electron microscopy. The results show that the soil is high liquid limit silt, which has the characteristics of high water cut, high void ratio and high saturation. The content of illite in the soil is the highest and the index of colloidal activity is high. Consolidation soil shows some structure in the consolidation test and shows the characteristics of strain hardening in the shear test. The microstructure of the soil is an open flocculation structure with loose skeleton and low degree of particle orientation.