非线性管土模型在海底管道悬跨疲劳评估中的应用  

Nonlinear Pipe-Soil Interaction Model Application on Pipeline Span Fatigue Assessment

作　　者：王猛[1] Wang Meng(Offshore Oil Engineering Co.Ltd.,Tianjin 300451,China)

机构地区：[1]海洋石油工程股份有限公司,天津300451

出　　处：《海洋工程装备与技术》2020年第5期264-268,共5页Ocean Engineering Equipment and Technology

摘　　要：本文将非线性管土模型应用于海底管道悬跨评估中。对管土模型的关键参数进行了敏感性分析。结果表明,关键参数中的土壤接触力对土壤剪切刚度和吸附力比较敏感,而对无量纲化最大刚度、吸附力衰减长度和再沉降偏移系数不敏感。土壤剪切强度较大时,管道沉降量小,P-y曲线变化范围较窄。非线性土壤在循环载荷作用下发生软化,使跨肩处管道疲劳损伤减小,最大损伤出现在跨中。The nonlinear pipe-soil interaction model is applied to fatigue assessment for free span of offshore pipeline in this paper.Sensitivity analysis of key parameters of the pipe-soil interaction model was carried out.The results show that soil normal force is relative more sensitive to soil shear stiffness and suction resistance ratio,but less sensitive to the normalized maximum stiffness,normalized suction decay distance and repenetration offset after uplift.When the soil shear strength is large,the pipeline settlement is small,and the range of P-y curve vary is narrow bound.The nonlinear soil can be degraded under cyclic load as will results in less fatigue damage of the span shoulder,and the maximum damage occurs in the middle of the span.

关 键 词：自由悬跨 海底管道 非线性管土作用 疲劳 

分 类 号：TE54[石油与天然气工程—油气田开发工程]