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[1]郅 彬,武李和乐,王 番,等.高应力作用下CFG桩复合地基承载变形机制[J].建筑科学与工程学报,2018,35(04):81-88.
　ZHI Bin,WU-LI He-le,WANG Pan,et al.Bearing Deformation Mechanism of CFG Pile Composite Foundation Under High Stress[J].Journal of Architecture and Civil Engineering,2018,35(04):81-88.
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高应力作用下CFG桩复合地基承载变形机制(PDF)
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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:
35卷
期数:
2018年04期
页码:
81-88
栏目:
出版日期:
2018-07-30

文章信息/Info

Title:
Bearing Deformation Mechanism of CFG Pile Composite Foundation Under High Stress
作者:
郅 彬，武李和乐，王 番，王永鑫，李 戈
西安科技大学建筑与土木工程学院
Author(s):
ZHI Bin, WU-LI He-le, WANG Pan, WANG Yong-xin, LI Ge
School of Architecture and Civil Engineering, Xi’an University of Science and Technology
关键词:
CFG桩复合地基; 高应力试验; 褥垫层; 桩土应力比
Keywords:
CFG pile composite foundation;  high stress test;  cushion;  pile-soil stress ratio
分类号:
-
DOI:
-
文献标志码:
A
摘要:
为探究水泥粉煤灰碎石桩（CFG桩）复合地基在高应力下的承载变形机制，基于西安市高新区拟建场地CFG桩复合地基高应力现场试验建立数值模型并进行分析。结果表明：该场地CFG桩复合地基的极限承载力不小于1 666 kPa；褥垫层在高应力作用下发生破坏，其协调桩土共同作用能力降低；桩顶向上刺入褥垫层，荷载向桩顶集中，致使桩承担上部荷载的96.5%；桩间土发挥作用能力受限，复合地基相当于单桩承载；褥垫层的厚度与桩土应力比的增长呈现负相关；桩间土与桩顶的沉降差随着荷载的增加而增加，且随着褥垫层厚度的增大呈现先增大再减小的趋势；当单桩承载力满足要求时，为保证高应力下桩间土不因荷载过大而造成复合地基的破坏，应适当减小褥垫层的厚度，降低其流动补偿能力；所得结论可为CFG桩复合地基在高层建筑地基处理设计提供参考。
Abstract:
In order to explore the deformation mechanism of cement fly-ash gravel pile (CFG pile) composite foundation under high stress, the numerical model of CFG pile composite foundation was established and analyzed based on the high stress test of planning site in Xian high-tech zone. The results show that the ultimate bearing capacity of CFG pile composite foundation in the site is not less than 1 720 kPa. The cushion layer is damaged under high stress, and the coordination ability about combined action of pile and soil is reduced. The pile top is thrust upward into the cushion layer, and the load is concentrated to the pile top, which causes the pile to bear 96.5% of the upper load. The capacity of soil between the piles is limited, and the composite foundation is equivalent to the single pile bearing. The cushion thickness is negatively correlated with the increase of pile-soil stress ratio. The settlement difference between soil and pile top increases with the increase of load, and the settlement difference increases firstly and then decreases with the increase of cushion thickness. When the bearing capacity of single pile meets the requirements, in order to ensure that the soil between piles under high stress is not damaged due to overloading, the cushion thickness should be reduced and the flow compensation ability should be reduced. The conclusion can provide reference for the design of CFG pile composite foundation in the foundation treatment of high-rise buildings.

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更新日期/Last Update: 2018-07-18