摘要
以浙江228国道旗门港特大斜拉桥工程的主塔桩基础为研究对象,运用有限元软件MIDAS-GTS NX对超长桩基础的承载性能进行了分析,并将荷载-位移曲线实测值与理论值进行了对比,验证了数值模拟的正确性。研究结果表明:桩基础以侧摩阻力承载为主,占桩承载的97%左右,但淤泥区桩侧摩阻力基本不发挥承载作用,仅占侧摩阻力承载的2.08%,超长桩主要依靠较好土层的桩侧摩阻力承载。在相同荷载下,桩径与桩长的增大均会减少桩的沉降量,但桩径的改变对沉降的控制效果更明显。在极限荷载下,不同桩径和桩长的超长桩端阻比均小于5%。
Taking the main tower pile foundation of the 228 National Highway Qimen port extra large cablestayed bridge project as research object,the bearing capacity of the super long pile foundation was analyzed with MIDAS-GTS NX software.The measured values of the load-displacement curve were compared with the theoretical values to verify the correctness of the numerical simulation.The research results reveal that the pile foundation is mainly supported by lateral friction,accounting for about 97%of the pile bearing.The lateral frictional resistance of the piles in the silt area does not play a role in bearing capacity,accounting for only 2.08%of the specific gravity of the side frictional load.The super long pile mainly relies on the pile side friction resistance bearing of the better soil layer.Under the same loads,the increases of pile diameter and pile length reduce the settlement of the pile,however,the change of pile diameter has more obvious control effect on settlement.Under the ultimate load,the end-resistance ratios of the ultra-long piles of different pile diameters and pile lengths are less than 5%.
作者
袁榛
梁斌
宋承龙
YUAN Zhen;LIANG Bin;SONG Chenglong(Civil Engineering School,Henan University of Science & Technology,Luoyang 471023,China;The First Engineering Company,China Railway 15th Bureau Group,Xi’an 710018,China)
出处
《河南科技大学学报（自然科学版）》
CAS
北大核心
2019年第5期62-68,M0005,M0006,共9页
Journal of Henan University of Science And Technology:Natural Science
基金
国家自然科学基金项目(U1604135)
河南省科技厅产学研合作基金项目(2015HNCXY011)
关键词
海上淤泥区
斜拉桥
超长桩基础
竖向承载
marine silt area
cable-stayed bridge
super long pile foundation
vertical bearing
