Destroying the undisturbed soil around the existing footprint relieves sliding risk during re-installation close to existing footprint.Physical simulation method was used to study soil-breaking effect of the leg jetting system at the bottom of the pile shoes of a typical jack-up platform.The results show that the leg jetting system can destroy the undisturbed clay around the existing footprint,with the maximum effective soil-breaking radius exceeding 1.5 m,and the maximum jetting depth within 0.2 m.Besides,how the jetting time,jetting pressure and soil shear strength act on the soil-breaking effect was revealed,with an innovative pile pitching process proposed,which can improve the efficiency of re-installation.
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