Research Of Sliding Risk Of Jack-up Platform In Inhomogeneous Stratum

Jack-up platform has been widely applied in the offshore oil and gas development in our country.However,the safety of jack-up platform often caused by sliding due to the complicated geologic conditions when the platform inserting and loading.As one of the most important factors leading to risk,sliding causes extra horizontal force and sliding bending moment to the platform when the platform inserts and increase the safety of leg structure and even the entire platform structure.The research about sliding problem of jack-up platform is still rare.Aiming at the sliding problem of jack-up platform,with experiment and numerical calculation,this paper puts forward a set of method predicting the risk of jack-up platform sliding and gets the effective conclusions:(1)To establish a set of domestic advanced testing scheme used in spudcan sliding risk in inhomogeneous stratum.The scientific test parameters are designed with the equivalent ratio.Through experiments the influence of various factors to the sliding force and bending moments are revealed.Compared with the results of numerical simulation analysis,the experiment scheme's practical is proved.This provide the basis for future study.(2)A set of numerical model about spudcan sliding is established in the application of CEL method in ABAQUS.The sliding process of jack-up platform's spudcan in various kinds of inhomogeneous stratum can be simulated accurately by that model.So the sliding rules are obtained and its effectiveness is verified by the test method.(3)A decision method of jack-up platform's spudcan sliding is presented under the given geological conditions.And apply the method to determine critical condition of spudcan sliding.