| 褥垫层对CFG桩复合地基加固作用的分析研究 |
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| 引用本文： | 郭海庆,杨毅,王振宇.褥垫层对CFG桩复合地基加固作用的分析研究[J].三峡大学学报(自然科学版),2013,35(2):56-60. |
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| 作者姓名： | 郭海庆 杨毅 王振宇 |
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| 作者单位： | 河海大学土木院岩土工程科学研究所,南京 210098;河海大学岩土力学与堤坝工程教育部重点实验室,南京 210098 |
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| 基金项目： | 国家自然科学基金项目资助，水利部公益性行业科研专项经费项目资助 |
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| 摘 要： | 褥垫层的设置对CFG（水泥粉煤灰碎石桩）复合地基的沉降特性有着较大影响，本文以广梧高速公路十八合同段k131＋010的CFG复合地基为实例，通过对褥垫层的作用机理进行详细讨论，得出最小褥垫层厚度公式，并运用三维有限差分程序FLAC-3D模拟了在不同褥垫层参数下CFG桩复合地基的沉降量及桩土应力比值．通过对模拟结果的分析表明，合理的褥垫层设计对桩土共同承担荷载起着重要的调节作用，可减少用桩数量，提高地基加固的效果．
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| 关 键 词： | 褥垫层参数 CFG桩复合地基 三维有限差分程序FLAC-3D 数值模拟 |
Analysis of Effect of Cushion on CFG Pile Composite Foundation Reinforcement |
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| Guo Haiqing
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Yang Yi
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Wang Zhenyu.Analysis of Effect of Cushion on CFG Pile Composite Foundation Reinforcement[J].Journal of China Three Gorges University(Natural Sciences),2013,35(2):56-60. |
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| Authors: | Guo Haiqing Yang Yi Wang Zhenyu |
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| Institution: | 1,2(1.Geotechnical Research Institute,Hohai Univ.,Nanjing 210098,China;2.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering,Hohai Univ.,Nanjing 210098,China) |
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| Abstract: | The cushion has a great effect on the settlement characteristics of the cement fly-ash gravel（CFG） pile composite subgrade. With the background of the 18th Contract Section k131 ＋010 CFG -pile composite subgrade of Guang-Wu Expressway, this paper discusses the working mechanism of cushion; and then a mini- mum cushion thickness formula is obtained~ using the three-dimensional finite difference software FLAC-3D, the CFG-pile composite subgrade settlement characteristics and pile-soil stress ratio under the different cush- ion＇s parameters are analyzed. The analytical results show that a reasonable cushion plays an important role in regulating the corporation of pile and earth undertaking the load; it also can decrease the number of piles and improve the effect of foundation reinforcement. |
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| Keywords: | cushion＇s parameters CFG pile composite subgrade three-dimensional finite difference soft- ware FLAC-3D numerical simulation |
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