桩靴支护结构对桩端极限承载力的影响  

The effect of optimized structures on the spudcan bearing capacity

作　　者：张兆德[1,2] 吕国兴[1,2] 张心[1,2] 

机构地区：[1]浙江海洋学院船舶与海洋工程学院,浙江舟山316022 [2]浙江省近海海洋工程技术重点实验室,浙江舟山316022

出　　处：《中国舰船研究》2016年第2期66-71,共6页Chinese Journal of Ship Research

基　　金：国家自然科学基金资助项目(51179173;51379189)

摘　　要：以渤海湾"胜利五号"自升式作业平台桩基贯入工程实例为基础,优化自升式平台桩靴支护结构位置,采用有限元数值模拟位置优化后的桩端极限承载力,并与实际桩端承载进行比较。优化结果表明:沿桩靴径向和垂向优化发现桩端极限承载力由内向外是先增大、后减小,支护结构在r'/r=0.6,h/H=0.4处优化达到预期效果;合理优化桩靴支护结构的位置可以改变桩靴上端面土体流动方向,减小土体对桩靴上端面冲量及桩靴上、下端面土体流速差,稳定贯桩过程,能够增加桩端极限承载力。Based on the engineering practice about the pile-soil penetration interaction of Shengli No.5Jack-up in Bohai Bay, a numerical model for the pile-soil penetration process is established to investigatethe bearing capacity of an optimized spudcan structure which is then compared to that of the real spudcan.The results show that the spudcan bearing capacity first increases and then decreases from inside to outsidealong the radial and vertical optimized position. At the radial r＇/r=0.6 position and vertical h/H=0.4 posi-tion, the optimized structure satisfies expectation. It is concluded that the supports in reasonable positionscan increase the spudcan bearing capacity and maintain the stability of the penetration process by changingthe flow mechanism of soil, which decreases the impulse and velocity deficit of the soil at the top and bot-tom of the spudcan.

关 键 词：自升式平台 桩靴 极限承载力 支护 数值模拟 

分 类 号：U674.381[交通运输工程—船舶及航道工程] TU473.11[交通运输工程—船舶与海洋工程]