考虑桩基错动的深水张力腿平台动力响应研究  

Dynamic response of deep-water TLP considering pile foundation dislocation

作　　者：余杨[1,2] 张晓铭 李振眠 周俊龙 成司元 崔宇朋 余建星[1,2] 杨政龙[1,2] YU Yang;ZHANG Xiaoming;LI Zhenmian;ZHOU Junlong;CHENG Siyuan;YU Jianxing;YANG Zhenglong(State Key Lab of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China;Tianjin Municipal Key Lab of Port and Ocean Engineering,Tianjin University,Tianjin 300072,China;China Construction Sixth Engineering Bureau Co.,Ltd.,Tianjin 300171,China)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]天津大学天津市港口与海洋工程重点实验室,天津300072 [3]中国建筑第六工程局有限公司,天津300171

出　　处：《振动与冲击》2023年第5期39-46,82,共9页Journal of Vibration and Shock

基　　金：中建股份科技研发课题(CSCEC-2020-Z-21);天津市科技计划项目(20JCQNJC01010);国家自然科学基金面上项目(52071234)。

摘　　要：由于地震、断层、滑坡和沉降等原因,张力腿平台(tension leg platform, TLP)下端的桩基可能发生错动。考虑平台本体有限位移、六自由度运动耦合、瞬时位置和瞬时湿表面、自由表面效应等非线性因素,建立TLP系统的耦合动力学方程。采用变步长龙格库塔算法编写了数值计算程序,得到了波浪作用下平台本体六个自由度运动响应和系泊张力响应。通过文献对比,验证了理论模型和计算程序的正确性。基于南海流花油田一年一遇的设计工况,计算得到桩基下沉0.1 m时16个工况下平台系统的动力响应的时间历程。以正常工况为基准,对比了不同工况中平台本体六个自由度运动、系泊张力的幅值和标准差,研究结果表明:桩基下沉对平台的六自由度响应和张力腿张力幅值产生明显的影响,但不加剧运动响应和张力响应的波动;桩基下沉会破坏平台系统原有的对称性,引起垂荡位移的较大恶化;桩基下沉会引起张力腿张力大幅增大,存在张力腿断裂和系泊失效的风险。Pile foundation at lower end of tension leg platform(TLP) may dislocate due to earthquake, fault, landslide and settlement. Here, considering nonlinear factors, such as, finite displacement of platform body, 6-DOF motion coupling, instantaneous position, instantaneous wet surface and free surface effect, dynamic coupled equations of TLP system were established. The numerical calculation program was compiled by using Runge-Kutta algorithm with variable step length, and 6-DOF motion responses and mooring tension response of TLP body under wave action were obtained. The correctness of the theoretical model and calculation program was verified through literature comparison. Based on the design condition of once a year in Liuhua Oilfield of south China sea, time histories of dynamic response of TLP system under 16 working conditions when pile foundation sinks 0.1 m were calculated. Based on normal working conditions, amplitudes and standard deviations of 6-DOF motions of TLP body and mooring tension under different working conditions were compared. The study results showed that pile foundation sinking has a significant impact on 6-DOF motion responses of TLP and tension amplitude of tension leg, but does not aggravate fluctuation of motion responses and tension response;pile foundation sinking can destroy the original symmetry of TLP system and cause a larger deterioration of heave displacement;pile foundation sinking can cause a large increase in tension of tension leg to have risks of tension leg fracture and mooring failure.

关 键 词：张力腿平台(TLP) 桩基错动 耦合模型 动力响应 系泊失效 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]