2D numerical study of wave and current-induced oscillatory non-cohesive soil liquefaction around a partially buried pipeline in a trench

OCEAN ENGINEERING

卷:135

Article

Duan, Lunliang¹  Liao, Chencong²  Jeng, Dongsheng^1,3  Chen, Linya¹ 

[1] Southwest Jiaotong Univ, Sch Civil Engn, Chengdu 610031, Peoples R China

[2] Shanghai Jiao Tong Univ, Dept Civil Engn, Shanghai 200240, Peoples R China

[3] Griffith Univ, Griffith Sch Engn, Gold Coast Campus, Southport, Qld 4222, Australia

关键词: Wave-current interactions;    Porous seabed;    Liquefaction;    Partially buried pipeline;    Critical backfill thickness;   

DOI  :  10.1016/j.oceaneng.2017.02.036

来源: Elsevier

【 摘 要 】

This paper proposes a two-dimensional (2D) coupled model for wave and current-seabed-pipeline interactions to examine oscillatory non-cohesive soil liquefaction around a partially buried pipeline in a trench. Unlike previous studies, two new features are included in this model: (1) wave-current interactions around the pipeline; and (2) fully coupled processes for the wave and current-seabed-pipeline system. In this study, the Reynolds Averaged Navier-Stokes (RANS) equations are applied to simulate the flow field around the pipeline, and Biot's poro-elastic theory for porous media is imposed to govern the soil response due to the wave-current loading. After being validated using data available in the literature, the 2D model is used to investigate the effects of the current velocity, the soil properties, and the wave characteristics on oscillatory non-cohesive soil liquefaction. Using the model, a function for the critical backfill thickness and the wave steepness under various flow and soil conditions is proposed to facilitate engineering practice.

【 授权许可】

Free