基于FLAC^(3D)的大直径钢管桩竖向承载特性分析  

Simulation of Vertical Capacity of Large-Diameter Steel Pipe Pile Based on FLAC^(3D)

作　　者：陈阳[1] 丰土根[2] Chen Yang Feng Tugen(Key Laboratory for Geotechnical Engineering of Ministry of Water Resources,Hohai University,Nanjing 210098,China Geotechnical Research Institute,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [2]河海大学岩土工程研究所,南京210098

出　　处：《河南科学》2016年第11期1845-1851,共7页Henan Science

基　　金：国家自然科学基金资助项目(51009054);教育部科学技术研究重点项目(109077);江苏省科学基金资助项目(BK2010513);中央高校基本科研业务费专项资金资助(2014B04914)

摘　　要：为研究不同桩径对大直径钢管桩竖向承载性能的影响,选取某海上风电钢管桩基础,采用FLAC3D软件对其进行分析,研究2.0~5.0 m直径钢管桩在加载过程中桩身内力的变化情况,揭示了2.5 m直径桩基的竖向承载性能发挥特点和桩-土相互作用情况;得出当直径小于4.0 m时,桩径的增大对钢管桩竖向承载力的影响较大,对桩侧土体正应力、桩外壁与内壁侧模阻力随桩径变化影响不明显;当桩径大于4.0 m时,承载力提高效果不甚明显,而桩-土相互作用出现一定差异,最后将承载力计算结果与规范所得结果进行对比,指出现有规范的局限性.In order to find the influence of different diameters to capacity of steel pipe pile with large diameter,acertain offshore wind farm project is chosen,and the software FALC3D is used to simulate steel pipe pile foundation withlarge diameter from 2.0 m to 5.0 m under different loading levels. The results find the performance of verticalbearing characteristics diameter and pile- soil interaction of pile with 2.5 m under different loading level,andshowthat when the diameter is less than 4.0 m,the increase of pile diameter has great influence on the verticalbearing capacity of steel pipe pile and has little effect on the normal stress and skin friction outside and inside pile.When the diameter larger than 4.0 m,is also shows the increase of pile diameter has little influence,but it has someeffect on the normal stress and skin friction. At last,the results of bearing capacity from numerical simulation andcodes are compared,and limitations of the existing codes are pointed out.

关 键 词：数值模拟 钢管桩 大直径 竖向承载性能 

分 类 号：TU473.1[建筑科学—结构工程]