非线性海床上J型铺管数值分析

Numerical Analysis of J-Lay on a Nonlinear Seabed

随着全球对能源的不断增需,海上油气生产逐渐扩展至深水和超深水区域。在这一应用背景下,型铺管系统在深水区域表现出了天然的适应性。本研究基于Winkler模型和宏单元模型开发了J型铺管法数值模拟方法,利用有限差分法精准模拟了其在非线性海床条件下的力学特性。通过解析解和模型试验对比验证了该方法的可行性。在水深和不同铺设角度变化的研究中,发现水深增加导致管线触地点埋深减小和土体抗力降低,而铺设角度的变化则影响管线的弯矩和土阻力。这些研究结果为J型铺管法在实际深水工程中的应用提供了有益的理论支持和参考。

With the continuous global demand for energy,offshore oil and gas production is gradually expanding into deep and ultra-deep water areas.In this application context,the J-lay system demonstrates inherent adaptability in deepwater regions.This study develops a numerical simulation method for the J-lay technique based on the Winkler and macro-element models.The method utilizes finite difference methods to simulate its mechanical characteristics under nonlinear seabed conditions accurately.Feasibility is validated through a comparison with analytical solutions and model experiments.The research explores the impact of varying water depths and laying angles,revealing that increased water depth results in reduced burial depth and soil resistance near the pipeline touchdown point.Additionally,changes in laying angles affect the pipeline's bending moment and soil resistance.These findings provide valuable theoretical support and references for the practical application of the J-lay laying technique in deepwater engineering.