To compare the bearing capacities of the traditional spudcan and the bucket spudcan, the effects of different-type spudcans on the rigidity of pile legs and the entire bearing capacity were analyzed in detail. Through the loading method of Swipe and constant displacement, this paper plots the spatial failure envelopes of the vertical-horizontal load, verticalmoment load, vertical-horizontal-moment load of the bucket spudcan and traditional spudcan under the mode of composite loading, as well as the spatial failure envelopes of the vertical static load-vertical cycling limit load, vertical static loadhorizontal cycling limit load based on these two spudcans under the mode of cycling loading. Theoretical study showed that the skirt system of bucket spudcan can increase the effective embedded depth, consequently improving the foundation rigidity and entire stiffness of a jack-up drilling platform. It is found that the bearing capacity of the horizontal load and moment load of the new spudcan is increased by at least 10％ than that of the traditional spudcan, especially the horizontal load being up to 20％ in the dyanmic load condition. Under the action of limit storm loading condition including wind, wave and flow loads, the entire bearing capacity of the jackup rig in stiff clay is increased by about 46 ％ with the bucket spudcan foundation compared to the traditional one.%为了比较筒型桩靴和传统典型桩靴装配平台的不同受力性能,详细分析不同桩靴型武对于桩腿刚性度和平台整体承载能力的影响.通过Swipe和固定位移比的加载方法,绘制了复合加载模式下筒型桩靴和传统桩靴基础的垂向荷载-水平荷载、垂向荷载-弯矩荷载、垂向荷载-水平荷截-弯矩荷载受力空间的破坏包络面和循环荷载条件下2种桩靴基础的垂向静荷载-垂向循环极限荷载、垂向静荷载-水平循环极限荷载受力空间的破坏包络面.理论研究表明,筒裙系统可以增加基础的有效埋置深度,从而提高平台基础的固定度和平台整体刚度.筒型桩靴可以把传统桩靴的水平和弯矩承载能力提高10%以上,在动荷载条件下水平承载力可以增长20%以上;在风浪流等极限风暴动荷载作用下,典型的海上自升武钻井平台在较硬黏土中使用筒型桩靴整体承载力比传统桩靴可提高46%.图8参26
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