黄河中下游冲积平原深长桩桩侧极限摩阻力研究  

Study on the limit shaft friction resistance of long piles in the middle and lower reaches of the Huanghe River alluvial plain

作　　者：董三升[1] 赵均海[1] 雷自学[1] 

机构地区：[1]长安大学建筑工程学院,陕西西安710061

出　　处：《西安建筑科技大学学报（自然科学版）》2011年第4期507-512,575,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：河南省交通厅基金资助项目(2007P325)

摘　　要：对于黄河中下游冲积平原砂性土层深长桩桩侧极限摩阻力问题,根据该地区的地质特性、采用有限元软件ABAQUS对大量不同参数的深长桩进行了建模分析,结果表明:桩顶荷载与桩侧摩阻力近似呈线性关系,桩长、桩径、桩-土界面条件、桩周土的力学性质等对桩侧摩阻力影响程度不同.根据有限元计算结果推导出了砂性土层深长桩桩侧极限摩阻力的计算公式,用其对工程实例进行验算,并将计算结果与静载试验实测结果进行了对比,二者吻合较好,说明有限元建模方法、参数设置及结论可靠,计算公式较准确.该研究可为该地区深长桩的优化设计提供参考.In order to investigate the limit shaft friction resistance of long piles in the middle and lower reaches of the Huanghe River alluvial plain of sandy soil,finite element software ABAQUS was adopted to simulate long piles with different parameters according to the geological characteristics in the region.The simulated results indicate that the load at the top of a pile is approximately in direct proportion to the shaft friction resistance of the pile;the length and diameter of the pile,the interface condition between pile shaft and surrounding soil,and the mechanical properties of surrounding soil may affect the shaft resistance of the pile to different extents.On the basis of simulation results,formulas for the calculation of limit shaft friction resistances of piles in sandy soil strata were derived and verified with a real project.Comparison of the computed results with those from static loading test showed good agreement between the two,indicating the validity of the finite element simulation method,selection of parameters and conclusions.The study is of reference value in the optimum design of long piles in the region.

关 键 词：深长桩 极限摩阻力 砂性土 有限元 

分 类 号：TU473.12[建筑科学—结构工程]