超长摩擦桩承载性状的有限元法  

FEM for analysis of bearing behaviors of over-length friction piles

作　　者：张齐兴[1] 姚波 俞中奇 

机构地区：[1]河海大学农业工程学院 [2]湖州市港航管理局,浙江湖州313000

出　　处：《河海大学学报（自然科学版）》2007年第6期681-685,共5页Journal of Hohai University(Natural Sciences)

摘　　要：基于三维有限元法,探讨了超长摩擦桩的数值模拟方法,分析了桩土界面单元、地基土单元模型参数对数值计算结果的影响.计算分析结果表明,桩周薄单元和地基土单元的模型参数对超长摩擦桩承载性状的影响很大,若均采用邓肯-张E-ν模型,抗剪强度指标、密度对桩顶极限荷载影响显著,而模量参数主要影响荷载-沉降曲线的斜率及极限荷载时的桩顶沉降量.The numerical simulation methods for over-length friction piles were discussed by use of 3D FEM, and the influences of the model parameters for soil-pile interface elements and foundation soil elements on the numerical results were analyzed. The results show that the model parameters for thin-layer interface elements an are of great influences on the bearing behavior of over-length friction piles. If Duncan ＆ Chang d foundation soil elements ＇s E-v model was adopted to simulate the foundation soil element and thin-layer interface element, the shear strength index and density of foundation soil are of evident effects on the ultimate load at the top of piles, while the modulus parameters mainly affect the slope of the load-settlement curve and the settlement at the top of piles under ultimate load.

关 键 词：超长摩擦桩 有限元法 桩土共同作用 桩土变形非线性 邓肯-张模型 

分 类 号：TU473.1[建筑科学—结构工程]