[1]任华锋.饱和松软土刚性桩复合地基失稳变形特性研究[J].高速铁路技术,2022,13(06):1-5.[doi:10.12098/j.issn.1674-8247.2022.06.001
]
REN Huafeng.Study on the Instability and Deformation Characteristics of Rigid Pile Composite Foundation in Saturated Mollisol[J].HIGH SPEED RAILWAY TECHNOLOGY,2022,13(06):1-5.[doi:10.12098/j.issn.1674-8247.2022.06.001
]
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饱和松软土刚性桩复合地基失稳变形特性研究()
《高速铁路技术》[ISSN:1674-8247/CN:51-1730/U]
- 卷:
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13卷
- 期数:
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2022年06期
- 页码:
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1-5
- 栏目:
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理论探索
- 出版日期:
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2022-12-20
文章信息/Info
- Title:
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Study on the Instability and Deformation Characteristics of Rigid Pile Composite Foundation in Saturated Mollisol
- 文章编号:
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1674—8247 (2022) 06—0001—05
- 作者:
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任华锋
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中铁二院工程集团有限责任公司,成都610031
- Author(s):
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REN Huafeng
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China Railway Eryuan Engineering Group Co. ,Ltd. ,Chengdu? 610031 ,China
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- 关键词:
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饱和松软土; 刚性桩复合地基; 离心模型试验; 数值仿真; 失稳变形
- Keywords:
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saturated mollisol; rigid pile composite foundation; centrifugal model test; numerical simulation; unstable deformation
- 分类号:
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U461.1
- DOI:
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10.12098/j.issn.1674-8247.2022.06.001
- 文献标志码:
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A
- 摘要:
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刚性桩复合地基常用于深厚软土地区,其失稳变形特性是饱和松软土复合地基设计考虑的关键因素之一。本文通过室内离心模型试验和数值仿真,分析了柔性荷载作用下刚性桩复合地基的沉降、变形规律及基桩稳定性,试验结果表明:当桩间距由3m增大到6m时,路基中心沉降及坡脚外侧隆起量均超过15mm,地基变形系数达到0.8,外侧刚性桩均出现断裂现象,复合地基发生失稳,建议桩间距控制在4m以内。
- Abstract:
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Rigid pile composite foundation is often used in deep soft soil areas,and its instability and deformation characteristics are one of the key factors in the design of composite foundations in saturated mollisol. This paper analyzes the settlement,the law of deformation,and pile stability of rigid pile composite foundations under flexible load through an indoor centrifugal model test and numerical simulation. The test results show that:when the pile spacing is increased from 3 m to 6 m,the settlement of the subgrade center and the uplift outside the slope toe exceed 15 mm,the deformation coefficient of the foundation reaches 0. 8,with the outer rigid piles broken,and the composite foundation is unstable. It is recommended that the pile spacing be controlled within 4 m.
参考文献/References:
[1] 郑俊杰,彭小荣. 桩土共同作用设计理论研究[J]. 岩土力学,2003,24(2): 242 - 245. ZHENG Junjie,PENG Xiaorong. Study on Design Theory of Pile-Soil Cooperative Work[J]. Rock and Soil Mechanics,2003,24(2):242 - 245.
[2] 徐至钧,王曙光. 水泥粉煤灰碎石桩复合地基[M]. 北京:机械工业出版社,2004. XU Zhijun,WANG Shuguang.Cement Fly Ash Gravel Pile Composite Foundation[M].Beijing: Machinr Press ,2004.
[3] 王炳龙,宫全美. CFG桩复合地基设计参数对地基沉降影响的数值分析[J]. 铁道建筑,2009,49(7): 24 - 26. WANG Binglong,GONG Quanmei.Numerical Analysis of the Influence of Design Parameters of CFG Pile Composite Foundation on Foundation Settlement [J]. Railway Engineering,2009,49(7): 24 - 26.[4] 丁桂伶,王连俊,刘升传,等. 刚性和柔性载荷试验中高速铁路CFG桩复合地基沉降变形特性对比分析[J]. 铁道标准设计, 2008,52(5): 1 - 3. DING Guiling,WANG Lianjun,LIU Shengchuan,et al. Comparative Analysis of Settlement and Deformation Characteristics of CFG Pile Composite Foundation of High-speed Railway in the Rigid and Flexible Load test[J]. Railway Standard Design,2008,52(5): 1 - 3.
[5] 刘吉福. 路堤下复合地基桩、土应力比分析[J]. 岩石力学与工程学报,2003,22(4): 674 - 677. LIU Jifu. Analysis on Dile-Soil Stress Ratio for Composite Ground under Embankment[J]. Chinese Journal of Rock Mechanics and Engineering,2003,22(4): 674 - 677.
[6] 刘杰,张可能. 柔性基础下群桩复合地基荷载传递规律及计算[J]. 岩土力学,2003,24(2): 178 - 182. LIU Jie,ZHANG Keneng. Load Transfer Law and Deformation of the Pile Group Composite Foundation under the Flexible Foundation[J]. Rock and Soil Mechanics,2003,24(2): 178 - 182.
备注/Memo
- 备注/Memo:
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收稿日期:2022-07-07
作者简介:任华锋(1980-),男,高级工程师。
更新日期/Last Update:
2022-12-20