Numerical study of pipe-soil interaction under lateral movements on different types of seabed conditions
摘要
The present research examined the seafloor's response to pipe loading circumstances for distinct seabed types. Seabed conditions are crucial in determining the interaction between surface-laid pipelines and soil reaction. This investigation is conducted using various constitutive soil models; however, their responses vary depending on the assumptions and restrictions applied. ABAQUS/Standard was used to assess the soil's resistance to pipeline lateral and axial movement, considering pipe embedment and shear strength characteristics. Linearly elastic, Mohr–Coulomb, and Drucker–Prager soil constitutive models were used to analyze dense sand bottom conditions. The Mohr–Coulomb and modified Cam-Clay failure criteria, incorporating strain rate and softening effects, were assessed for the sandy-clay soil. Each hypothesis responds differently to stress, strain, and displacements under the same loading conditions. The behavioral pattern of seabed soil in dense sand conditions is similar between the Mohr–Coulomb and Drucker–Prager soil models. However, the numerical model shows that the Drucker–Prager criterion overestimates lateral and vertical displacement, while maintaining similar stress levels but a conservative strain rate. For sandy clay seabed, the modified Cam Clay (MCC) soil model incorporates strain rate and soil softening. The idealized Mohr–Coulomb soil model, irrespective of strain rate and soil softening, was used for comparison.