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第4期 水利 水运 工程学 报 No.4 Dec.2008 双层土体结构对超长桩承载性状的影响 姚 波1,徐 闪2,张齐兴3 (1.浙江省湖州市港航管理局,浙江湖州313000;2.江苏省交通厅苏北航务管理处,江苏淮安223002; 3.河海大学农业工程学院,江苏南京210098) 摘要:利用三维有限元方法,研究了双层地基土中超长桩的承载性状.利用线弹性模型模拟桩身混凝土的应力 应变关系。邓肯.张非线性弹性模型模拟地基土,河海大学薄单元模型模拟桩一土间的非连续变形.计算结果表 . 明,对上硬下软地基土结构,当硬土层厚度不大于桩身人土深度时,随硬土层厚度的增大,桩顶极限荷载、桩侧 极限阻力均呈非线性增大;对上软下硬地基土结构,当软土层厚度不大于桩身人土深度时,随软土层厚度的增 大,桩顶极限荷载、桩侧极限阻力均呈非线性减小;桩身轴力和桩侧阻力沿深度的分布随地基土结构而异,桩侧 摩阻力在硬、软土层分界处有急剧变化现象;超长桩的失稳由桩侧土体的破坏引起. 关 键 词:超长桩;双层地基土;承载性状;桩身轴力;桩侧摩阻力 中图分类号:TU443 文献标识码:A Numericalonbehaviorsof in soil study lengthypile two-layer YAO B01,XUShan2,ZHANG Qi.xin93 BureauHuzhou 31 Administration of City,Huzhou3000,China;2.Subeiof (1.Port.ShippingManagement ProvincialCommunications of NavigationalAffairs,Jiangsu Department,Huaian 21 University,Nanjing0098,China) AgriculturalEngineering,Hohai ona3-dimensionalfiniteelement D behaviorsof in Abstract:Based method(3FEM),the lengthypile two-layer studied.Thestress.strain of concretearesimulatedalinearelastic soilhavebeen relationshipspile by model,and anonlinearelasticmodel Duncan thatofthesoilissimulated and by developedby Chang.Aspecialthin—layer isusedtosimulatethe betweenandsoil.
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