海洋科学2023，Vol.47Issue(10)：25-31,7.DOI:10.11759/hykx20230904004
深水井口导管管土界面摩擦退化试验研究
Experimental study on soil-conductor interface friction deg-radation of wellhead in deepwater
摘要
Abstract
The penetration resistance of a deep-water conductor in clay is closely related to its friction resistance at the conductor-soil interface.During the installation of this conductor,considerable displacement occurs at the soil-pipe interface,causing degradation in the friction at the conductor-clay interface.Conventional shear testing devices cannot accurately describe this degradation mechanism at the conductor-soil interface under large dis-placement shear during the conductor penetration;therefore,in this study,to address this limitation,the GDS mul-tifunctional interface shear testing apparatus was used to conduct large displacement monotonic shear tests under constant stress conditions.The aim was to investigate the influence of normal stress on the degradation mechanism of friction at the conductor-soil interface.The experimental results indicate that during the monotonic shear,the interfacial shear stress initially increases with shear displacement and then decreases,eventually reaching a stable state.The interface exhibits shear stress degradation.With increasing normal stress,the peak stress and residual stress at the interface also increase.The normal displacement of the soil sample increases with shear displacement and normal stress and eventually reaches a stable value.Based on the analysis of the experimental data,a simple method is proposed to calculate the interfacial shear stress with increasing dimensionless displacement considering the shear stress degradation mechanism.Finally,by combining an engineering case study of a conductor at a depth of 80 m,degradation of the interfacial friction is demonstrated to have reduced penetration resistance by 28.48%.关键词
导管/贯入阻力/黏性界面/摩擦退化/界面剪切试验Key words
conductor/penetration resistance/adhesive contact interface/friction degradation/interface shear test分类
海洋科学引用本文复制引用
刘书杰,何连,刘正,包兴先,王腾..深水井口导管管土界面摩擦退化试验研究[J].海洋科学,2023,47(10):25-31,7.基金项目
国家自然科学基金项目(52078483)National Natural Science Foundation of China,No.52078483 （52078483）
