Jack-up Sliding And Its Influence On Platform Structure

The jack-up platform is widely used in offshore oil and gas fields for its economy,high efficiency and flexibility.However,due to the complex geological conditions of seabed and the remaining traces of platform,jack-up platform will have the risk of sliding,and the result will lead to damage to the platform structure.The sliding not only makes the platform bear the additional sliding force and sliding moment,but also makes the inclination angle of the pile leg exceed the safety angle,causing the pile lifting device to be stuck.Therefore it is of great significance to the research of platform sliding.The main contents of this paper are as follows:(1)On the basis of the law of Kulun,considering the factors of the self-weight of the soil in each cracked area and the friction between the side surface of the spudcan and the soil,the paper puts forward a method of calculating horizontal bearing capacity.(2)Based on the CEL model,the finite element model is established,and the sliding characteristics under the influence of single layer sand,single layer clay,double layer soil and old footprint are analyzed.(3)In this paper,the finite element method is used to simulate the platform sliding progress,and the change of the shape and stress distribution is analyzed under the condition of different sliding displacement of the bow,port side and starboard.Through the study of the above,not only the sliding problem of the jack-up plat-form is further understood,but also provides the basis for the research direction and content of the next step.At the same time,it also has important guiding significance for the safe operation of the platform.