Discussion on punch-through calculation method of jackup

Jackup installation is often faced with potential punch-through problems, which could produce fatalities on the legs or jacking systems.Thus it is essential to perform installation safety assessment on site specifically before deployment.Based on research of punch-through calculation methods in home and abroad, investigations on shear force of the firm layer, ultimate bearing capacity and safety factor are discussed.An analysis flow chart for potential punch-through site is also proposed.Finally, this analysis method is illustrated with HYSY9××installation as an example.