| 武广高铁CFG桩复合地基工后沉降影响因素 |
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| 引用本文： | 张峰,刘莹,许兆义,李志义.武广高铁CFG桩复合地基工后沉降影响因素[J].西南交通大学学报,2015,28(5):783-788. |
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| 作者姓名： | 张峰 刘莹 许兆义 李志义 |
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| 摘 要： | 为了研究软土地区高速铁路CFG(cement flyash gravel)桩复合地基工后沉降,以武广客专试验段为例,基于有限元理论,借助ABAQUS软件,对多个影响CFG桩复合地基工后沉降的因素进行数值模拟,分析各因素对其沉降的影响程度和规律,确定控制沉降量的主要因素.研究结果表明:增大桩的弹性模量或桩径,桩土应力比均增大;增大垫层厚度,桩土应力比减小;采用钢筋混凝土管桩和CFG桩组合时,在CFG桩桩顶的最大沉降为2.01 mm,与全为管桩的情况相比,不均匀沉降减小了46.5%.
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| 关 键 词： | 软土 复合地基 工后沉降 影响因素 |
| 收稿时间： | 2015-06-03 |
Factors Influencing Subgrade Post-Construction Settlement of CFG Pile Composite Foundation in Wuhan-Guangzhou High-Speed Railway |
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| ZHANG Feng,LIU Ying,XU Zhaoyi,LI Zhiyi.Factors Influencing Subgrade Post-Construction Settlement of CFG Pile Composite Foundation in Wuhan-Guangzhou High-Speed Railway[J].Journal of Southwest Jiaotong University,2015,28(5):783-788. |
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| Authors: | ZHANG Feng LIU Ying XU Zhaoyi LI Zhiyi |
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| Abstract: | In order to study the post-construction settlement of CFG(cement flyash gravel)pile composite foundation of high speed railway in soft soilI areas, finite element numerical simulations were made using ABAQUS software for several factors that influence the post-construction settlement of the CFG pile composite foundation in Wuhan-Guangzhou high-speed railway. On this basis, the influence degree and variation of each factor on the settlement was discussed to determine the main control factors of the settlement. The result shows that an increase in the elastic modulus or pile diameter will result in an increase in the stress ratio of pile to soil, and increasing the cushion thickness will decrease the stress ratio of pile to soil. When a combination of reinforced concrete pipe piles and CFG piles is used, the maximum settlement on the pile top is 2.01 mm, and uneven settlement is decreased by 46.5% compared with that using reinforced concrete pipe piles only. |
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