基于FLAC3D盘径比对挤扩支盘桩承载性状的影响研究  

STUDY ON INFLUENCE OF PLATE-PILE DIAMETER RATIO ON BEHAVIOR OF SQUEEZED BRANCH PILES BASED ON FLAC3D

作　　者：向劲东 彭社琴[1] 郑卫锋 孙珍茂[3] XIANG Jin-dong;PENG She-qin;ZHENG Wei-feng;SUN Zhen-mao(College of Environment and Civil Engineering,Chengdu University of Technology,610059,Chengdu,China;China Electric Power Research Institute,100085,Beijing,China;Sichuan Electric Power Design Consulting Co.,Ltd.,610041,Chengdu,China)

机构地区：[1]成都理工大学环境与土木工程学院,成都610059 [2]中国电力科学研究院有限公司,北京100085 [3]四川电力设计咨询有限责任公司,成都610041

出　　处：《建筑技术》2020年第8期971-975,共5页Architecture Technology

基　　金：国家重点研究发展计划(2011CB013501)。

摘　　要：挤扩支盘桩依靠其成本低、承载力相对高、抗拔抗压性能好等特点在非岩质地基中应用日渐广泛。基于FLAC3D数值模拟软件,通过改变支盘桩的特征变量——盘径比(D/d),研究支盘桩在下压荷载下的沉降变形、桩身轴力、桩侧摩阻力、支盘阻力的变化和桩周土的变形,结果表明盘径比越大支盘桩的抵抗沉降的能力越强;盘径比的改变会影响桩侧、承力盘及桩端承载能力的发挥,进而很大程度地影响支盘桩承载性状。Because of the low cost,relatively high bearing capacity and uplift and compression resistance,squeezed branch pile is widely used in non-rock foundation.Based on FLAC3D numerical simulation software,this paper studies the settlement and deformation of squeezed branch piles,the changes of pile shaft force,pile side friction and branch-plate bearing resistance,and the deformation of soil around piles by changing D/d,a characteristic variable of squeezed branch piles.The numerical analysis results show that the larger the plate-pile diameter ratio,the stronger the resistance of the piles to resist settlement.The change of the D/d ratio will affect the bearing capacity of the pile side,the bearing plate and the pile end,and furthermore,greatly affect bearing behavior of the squeezed branch pile.

关 键 词：支盘桩 盘径比 数值模拟 承载性状 

分 类 号：TU473[建筑科学—结构工程]