摘要
利用三维弹塑性有限元,考虑群桩基础周围外侧土体竖向变形影响范围和桩端土体压缩层厚度的因素,研究分析其对大型哑铃型承台群桩基础承载变形特性的影响,从而研究大型超深群桩基础边界问题以及离心模型试验边界对其承载变形特性的影响。研究表明:群桩基础边界大小由群桩基础变形特性控制,成桥阶段时大型哑铃型承台群桩基础周围外侧土体竖向变形影响范围和桩端土体压缩层影响深度,分别为一倍承台宽度和一倍桩长;设计的离心模型试验边界对群桩基础桩身受力大小与分布影响不大,而对承台沉降和桩端土体整体压缩变形比等变形特性影响较大。
Influence of boundaries of centrifuge model on the behaviour of pile groups with dumbbell shaped pile-cap supporting for a super large bridge was analyzed with 3-D elastic-plastic FEM. It was shown that the influential zone of vertical deformation of soil around pile groups and the influential thickness of compressive stratum under pile tips were approximately equal to the width of pile-cap and pile length respectively under the design load. The influence of boundaries of centrifuge model was small on the distribution and magnitude of the axial forces of pile group, but large on the deformation characteristics.
出处
《岩土工程学报》
EI
CAS
CSCD
北大核心
2007年第2期260-267,共8页
Chinese Journal of Geotechnical Engineering
关键词
边界
群桩基础
离心模型
数值分析
boundary
group piles foundation
centrifuge modeling
numerical analysis
