西太平洋深海沉积物的物理力学性质初探

摘要

Sediment types were determined for 20 columnar sediment samples from the seafloor of western Pacific using the smear identification. Geotechnical test and analysis were conducted for 2 columnar samples on site, with physico⁃mechanical properties obtained, including water content, density, micro penetration resistance and torsion shear strength. Results show that deep⁃sea sediments type, being uniform, is predominately zeolite clay and pelagic clay, which is 10 meters deep from the seafloor in the study area. It is found a good consistency between physico⁃mechanical properties of sediments and sediments type. Due to being effected by sedimentary rate, sediment source and environmental factors, the deep⁃sea sediment appears to have a relatively complex formation regulation for its interior structure, which remains for further discussion.%针对从西太平洋海底获取的20个深海沉积物柱状样品进行了涂片鉴定，确定了沉积物类型；对2个柱状样品进行了现场土力学测试分析，获得沉积物的天然含水率、天然密度、微型贯入阻力和扭力抗剪强度等物理力学性质。结果表明：研究区海底10 m以浅的深海沉积物类型单一，以含沸石粘土和深海粘土为主；沉积物物理力学性质与沉积物类型基本一致，二者之间表现出良好的一致性；但受控于沉积速率、沉积物源及环境因素影响，其内部规律较为复杂，有待进一步探讨。