铁道科学与工程学报2017，Vol.14Issue(8)：1632-1638,7.
循环荷载作用下超长桩动力特性研究
Study on the dynamic characteristics of super-long pile under cyclic loading
摘要
Abstract
On the basis of considering the strength weakening of pile foundation under dynamic action, the feasibility of applying the strength reduction method in FLAC3D was validated by fitting the numerical simulation results and experimental results. The numerical simulation model of super-long pile under cyclic loading was established. The dynamic characteristics of super-long pile were analyzed from the aspects of frequency, load amplitude, load amplitude, cycle times, ratio of pile to soil stiffness and pile length. The numerical analysis shows that higher frequency and lower amplitude of load result in smaller accumulated settlement of super-long pile top. The constant load of the cyclic load has little influence on the dynamic settlement of the super-long pile. The settlement of pile top gradually increases with the cyclic loading times, and tends to be stable with the increase of the number of cycles. Higher ratio of pile to soil stiffness and shorter pile length result in bigger accumulated settlement of super-long pile top.关键词
循环荷载/超长桩/土体强度弱化/强度折减法Key words
cyclic loading/super-long pile/soil strength weakening/strength reduction method分类
建筑与水利引用本文复制引用
汪优,秦志浩,汤明明..循环荷载作用下超长桩动力特性研究[J].铁道科学与工程学报,2017,14(8):1632-1638,7.基金项目
国家自然科学基金资助项目(51308552) （51308552）
湖南省高校创新平台开放基金资助项目(14K105) （14K105）
