大直径扩底桩竖向承载力影响因素分析-《郑州大学学报(工学版)》

文章信息/Info

Title:: Factors for Vertical Bearing Capacity of Large-diameter Belled Piles

Author(s):: ZHANG Qi; LI Kunxuan; WANG Junlin; 1. Water Resources Research Institute of Henan Provinee,Zhengzhou 450003 ,China; 2. $ehool of Water Conservaney and Envi.ronment,Zhengzhou University,Zhengzhou 450001，China

Keywords:: pipe-soil interaction model; vertical bearing capacity; influence factor; finite element method

摘要:: 运用国际上通用的大型有限元软件ANSYS建立了桩-土作用的有限元模型,结合某工程实例,分析了大直径扩底桩竖向承载力的影响因素.通过把模拟结果与桩基静载荷试验对比,得出有限元结果与实测值接近；然后采用有限元方法模拟分析了不同扩底直径、扩底高度和桩长对大直径扩底桩竖向承载力的影响.结果显示,大直径扩底桩的竖向承载力随着扩底直径的增加而提高,当D/d大于2时,承载力的增长幅度开始变缓；承载力随着扩底高度的增加而提高,但是增长幅度比较缓和；承载力随着桩长的增加而提高,但桩长增大到一定程度时,承载力的增长幅度变得缓慢起来.

Abstract:: This paper applies intemational general large-scale finite element sotware ANSYS to establish thefinite element model of pile-soil interaction, with a project example, the influence factors for vertical bearingcapacity of large-diameter belled conerete piles are analyzed. Through comparing the simulated results withfield test results, it gets the results of finite is close to the measured value; and then different pile length.belled diameter and belled height influenee on the vertical bearing capacity are simulated and analyzed by thefinite element method. The results show that the belled diameter is larger, the vertical bearing capacity ishigher, the growth is slower when D/d is greater than 2; the belled height is larger, the vertical bearing ca-pacity is higher, but the growth is slow; the length of pile is longer, the vertical bearing capacity is higher,but the growth is slower when the length increase to a certain degree.