[1]乔卫国,杨麟,李大勇,等.高频振动沉桩的离散元模拟分析[J].西安科技大学学报,2012,(05):604-609.
 QIAO Wei-guo,YANG Lin,LI Da-yong,et al.Numerical analysis of piles driving by high frequency vibration using discrete element method[J].Journal of Xi'an University of Science and Technology,2012,(05):604-609.
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高频振动沉桩的离散元模拟分析(/HTML)
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西安科技大学学报[ISSN:1672-9315/CN:61-1434/N]

卷:
期数:
2012年05期
页码:
604-609
栏目:
出版日期:
2012-10-31

文章信息/Info

Title:
Numerical analysis of piles driving by high frequency vibration using discrete element method
文章编号:
1672-9315(2012)05-0604-06
作者:
乔卫国12杨麟12李大勇12吕言新12李睿12王立华12
1.山东科技大学 土木建筑学院,山东 青岛 266590; 2.山东省土木工程防灾减灾重点实验室,山东 青岛 266590
Author(s):
QIAO Wei-guo12YANG Lin12LI Da-yong12LV Yan-xin12LI Rui12WANG Li-hua12
1.Institute of Civil Engineering and Construction, Shandong University of Science and Technology, Qingdao 266590, China; 2.Shandong Provincial Key Lab of Civil Engineering Disaster Prevention and Control, Qingdao 266590,China
关键词:
高频振动 沉桩 数值模拟 PFC2D 离散元
Keywords:
high frequency vibration pile driving numerical simulation PFC2D discrete element method
分类号:
TU 473
文献标志码:
A
摘要:
应用平面颗粒离散元软件PFC2D对高频振动沉桩过程进行数值模拟分析,在细观颗粒运动层面上研究高频振动沉桩的机理,得到了桩侧摩阻力的分布变化规律,分析了贯入深度和贯入速率随时间变化规律,提出了“贯入平台期”的概念,并从能量传递和能量平衡角度分析了出现的原因,研究总结了桩周土颗粒的运动规律。结果表明:贯入度一定时,侧摩阻力随深度增加,到一定深度趋于定值; 贯入度变化时,同一深度处侧摩阻力随最终贯入度增加而退化。高频振动沉桩贯入速度快,最大贯入速率能达到0.38 m/s,其中贯入平台期的出现是由于振动锤系统传递到桩的能量不足以克服贯入阻力并引起土颗粒共振。高频振动沉桩引起桩周土颗粒运动按区域分布各有特点。
Abstract:
Numerical analysis using the PFC2D software is applied to model the process of piles driving by high frequency vibration to study its mechanism in the microscopic aspect of particle movement. Through the analysis, the distribution and change of side friction are discussed; the variation of depth and velocity during penetration with time are obtained, together with the variation of soil movements around the pile. The concept of penetration stagnation stage is put forward. The results show that the side friction increases with depth and would come to a relatively constant value finally with a certain pentration. In the same depth, the side friction decreases with penetration. Driven by high frequency vibration piles penetrate with high efficiency, and the top penetration rate would reach to 0.38 m/s. The penetration stagnation stage comes up when the kinetic energy of pile delivered from vibration hammer system is insufficient to overcome the penetration resistance and cause the resonance of soil particles. The soil particle movements caused by high frequency vibration have different characteristics in different regions.

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备注/Memo

备注/Memo:
收稿日期:2012-06-10
基金项目:教育部新世纪优秀人才支持计划资助项目(NCET-07-0519); 山东省自然科学基金项目(ZR2009FM071); 山东科技大学研究生科技创新基金项目(YCA110324)
通讯作者:乔卫国(1963-),男,山东荣成人,教授,博导,主要从事岩土加固理论与应用技术的教学、科研工作.
更新日期/Last Update: 1900-01-01