Collision Analysis Between Spudcan and Seabed During the Process of Jack-up Platform Lowering Jack-up Legs  

作　　者：LE Cong-huan LI Yan-e HUANG Lei REN Jian-yu DING Hong-yan ZHANG Pu-yang 

机构地区：[1]State Key Laboratory of Hydraulic Engineering Simulation and Safety,Tianjin University,Tianjin 300072,China [2]School of Civil Engineering,Tianjin University,Tianjin 300072,China [3]China Classification Society(CCS),Tianjin 300457,China

出　　处：《China Ocean Engineering》2021年第5期779-788,共10页中国海洋工程（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Grant No.51779171);the Tianjin Municipal Natural Science Foundation(Grant No.18JCYBJC22800)。

摘　　要：In the leg-lowering process,the offshore jack-up platform is in a floating state,and the spudcan may collide with the seabed due to the platform motion in waves,thereby threatening the safety and stability of the platform.This paper first analyzed the hydrodynamic response of a jack-up platform under different sea states.Then a finite-element model was established which considered the material and geometrical nonlinearity in the structure and the nonlinear interaction between soil and structure to investigate the collision response between the spudcan and seabed during lowering jack-up legs.The results show that the dynamic response of the platform decreases and gradually tends to be stable as the wave period increases.The motion response of the platform reach the largest value when the wave period is 8 s and the wave direction is 0°.The collision angle between the spudcan and seabed has a large influence on the collision response,while the velocity of leg-lowering has little influence on the collision response.The collision response is also significantly affected by soil conditions.For clay,the increase in undrained shear strength and Young’s modulus will increase the impact force.

关 键 词：jack-up platform SPUDCAN COLLISION dynamic response 

分 类 号：P75[天文地球—海洋科学]