上拔荷载作用下挤扩支盘桩颗粒流数值模拟  

Numerical Simulation on Particle Flow of Squeezed Branch Pile under Uplift Loading

作　　者：周喻[1] 李健[1] 吴顺川[1,2] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083

出　　处：《路基工程》2011年第3期13-15,共3页Subgrade Engineering

基　　金：2006年教育部新世纪优秀人才支持计划(NCET-06-0084)

摘　　要：基于颗粒流理论,采用PFC2D程序,研究粘土地基中挤扩支盘桩受上拔荷载时,荷载-桩体位移关系、土体变形破坏情况及地基位移场分布。结果表明:荷载与桩体位移变化曲线分为初始弹性阶段、中间塑性阶段和破坏阶段;土体破坏产生的滑裂面主要从下部支盘的端部沿斜上方向地表发展;土体颗粒受影响区域为倒钟形。Based on particle flow theory,load-pile displacement relationship,soil deformation and distribution of foundation displacement field when squeezed branch pile under uplift loading in clay foundation are studied using PFC2D program.The results show that load-pile displacement curve is classified into initial elastic stage,intermediate plastic stage and failure stage.Sliding face caused by soil failure is mainly from the tip of lower branch into ground surface along oblique direction.Soil particles are affected within inverted bell-shaped area.

关 键 词：上拔荷载 挤扩支盘桩 颗粒流理论 PFC2D 

分 类 号：TU473.1[建筑科学—结构工程]