摘要
以某高速公路高填方路堤中桩基挡墙支挡结构为对象,研究其极限状态及稳定性.基于现场试验监测结果,建立了三维有限差分数值模型.通过对比抗滑桩极限承载力、挡土墙极限位移和基座混凝土极限压应力所对应的路面荷载,提出了桩基挡墙极限状态的确定方法.分析了设计行车荷载下桩基挡墙的稳定性,探讨了填土重度、填土内摩擦角和抗滑桩桩间距等参数对桩基挡墙结构稳定性的影响.研究结果表明:随路面荷载不断增大,桩基挡墙结构首先出现抗滑桩剪切破坏,结构承载力极限状态由抗滑桩抗剪承载力确定;填土重度和内摩擦角对桩基挡墙结构稳定性影响较大,减小桩间距能一定程度上提高支挡结构稳定性.
A series of studies were conducted on the limit state and stability of retaining wall based on anti-slide pile,which was used in a high-fill expressway embankment.A three-dimensional finite difference numerical model was established based on the field measurements.The method of checking the limit state of the retaining structure was proposed by comparing the ultimate strength of the antislide pile,displacement of the retaining wall,and compressive stress of the base.Meanwhile,the stability of the retaining structure suffering the design traffic load was also analyzed,and the effect of some key factors,including the unit weight and internal friction angle of fill,the spacing of the antislide pile,on the stability of retaining structure were further studied.Results show that shear failure of the anti-slide pile appears first in the retaining structure as the load on the pavement increases.The density and internal friction angle of the fill have great effect on the stability of the retaining structure while the reduction of the anti-slide pile spacing could increase the stability of the retaining structure to a limited extent.
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2016年第4期74-78,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51278216)
中国博士后科学基金资助项目(2015M582225)
关键词
桩基挡墙
极限状态
稳定性
现场试验
数值模拟
参数分析
retaining wall based on anti-slide pile
limit state
stability
field test
numerical simulation
parametric study
