倾斜荷载下单排刚性桩复合地基极限承载力  被引量:2

Ultimate bearing capacity of single row rigid pile composite foundation under inclined load

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作  者:郑刚[1] 龚立森 周海祚[1] 杨新煜 

机构地区:[1]滨海土木工程结构与安全教育部重点实验室(天津大学)天津大学建筑工程学院,天津300072

出  处:《中国港湾建设》2015年第12期1-6,共6页China Harbour Engineering

摘  要:刚性桩复合地基由于桩体发生破坏而达到地基极限承载力的问题缺乏研究。首先采用有限差分法确定倾斜荷载作用下条形基础刚性桩复合地基破坏面形式,然后通过考虑桩体发生弯曲破坏时对地基承载力的贡献,基于Tresca屈服准则和非对称破坏模式,采用极限分析上限法推导出严格上限解的极限承载力系数,并应用蒙特卡洛随机优化方法给出最优解。分析表明,当刚性桩复合地基桩体发生弯曲破坏时,破坏面随荷载倾斜率和桩间距增加而变浅,随桩径和桩体强度的增加而变深,从而承载力系数随桩体强度和桩径的增大而增大,随桩间距以及荷载倾斜率的增大而减小。在荷载倾斜率确定情况下,给出桩体强度、桩径、桩间距的建议值。The influence of the collapse of the pile on the ultimate bearing capacity of the rigid pile composite foundation has not been investigated deeply. A finite difference method was adopted to study the failure mode of the ground improved by the rigid pile under inclined load. Based on the Tresca yield criterion and non-symmetric failure mechanism was proposed by upper-bound solution, which considered the contribution of the rigid pile. The optimal solution was obtained by the Monte Carlo Method. The results show that the critical failure mode for rigid pile is bending failure. The observed slip surface of the composite ground becomes shallower with the increase of the load inclination ratio and the pile spacing, while it becomes deeper as the pile strength and the pile diameter increase. Correspondingly, bearing capacity coefficient increases with the pile strength and the pile diameter, but decreases with load inclination ratio and the pile spacing. The recommended values of the strength of the pile, the pile diameter and the spacing of the piles were proposed.

关 键 词:刚性桩 复合地基 倾斜荷载 极限分析 破坏模式 

分 类 号:U655.544[交通运输工程—港口、海岸及近海工程] TU473[交通运输工程—船舶与海洋工程]

 

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