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摘要: 基于在自行改进设计的水下土体剪切界面摩擦力测定装置进行的室内试验结果,对不同粒组、含水率及剪切速率条件下土体剪切界面抗剪强度和摩擦力进行了研究。试验结果表明,不同土体间剪切界面抗剪强度和摩擦力与土体颗粒粒组、含水率相关性表现不同。随着含水率的增加,粉砂抗剪强度和摩擦力呈增加趋势,细砂、中砂抗剪强度和摩擦力受含水率变化影响较小。土体颗粒粒组不同,抗剪强度和摩擦力有明显差异,表现在粉砂大于细砂和中砂,小于黏粒含量较高的粉土,细砂和中砂的差别较小。试验条件下得到的粉砂、细砂、中砂土体与粉质土底床间的水下剪切界面摩擦力值在0.2~1.0 kPa区间,并结合海洋地质实例说明界面摩擦力的应用。Abstract: Using an improved self-designed apparatus for measuring the friction of shearing interface of underwater soils in the laboratory,we studied the relation of the interfacial shear strength and the interfacial friction of the soil with different particle size,water content and shear rates. The results show that the interfacial shear strength and the interfacial friction of the sandy silt are positively correlated with water content, and there is no significant changes in fine grained sand and medium sand with different water content. We also investigated the interfacial shear strength and the interfacial friction with the particle size of the soils, and found that the shear strength and interfacial friction change in an order of silty soil > sandy silt> fine sand ≈ medium sand. The values of friction of shearing interface underwater between various kinds of soils and silty soil-bed were 0.2-1.0 kPa and the application of interface friction force in the case of marine geological conditions are also discussed.
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Key words:
- friction /
- shear strength /
- particle size /
- water content /
- shear rate
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