| 考虑桩靴贯入对邻近群桩效应影响的分析方法 |
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| 引用本文： | 范怡飞,王建华.考虑桩靴贯入对邻近群桩效应影响的分析方法[J].岩土力学,2020,41(7):2360-2368. |
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| 作者姓名： | 范怡飞 王建华 |
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| 作者单位： | 1. 天津大学 水利工程仿真与安全国家重点实验室，天津 300072；2. 天津大学 岩土工程研究所，天津 300072 |
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| 基金项目： | 国家自然科学基金（No.51579174）。 |
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| 摘 要： | 为考虑钻井船插桩对邻近平台群桩相互作用的影响，以海洋平台群桩设计中使用的修正Poulos法为基础，提出了一种考虑桩靴贯入影响的群桩分析方法。该法基于非线性地基梁模型确定桩靴贯入土层时单桩桩头位移；依据桩同时承受桩头荷载与土体位移时对应的地基反力系数确定土层的弹性模量，进而在Poulos群桩相互作用分析理论框架内，分析桩靴贯入对群桩相互作用的影响，确定桩靴贯入过程中由于群桩相互作用导致的附加桩头位移及相应的群桩桩头位移；依据群桩桩头位移，确定考虑桩靴贯入影响的群桩p-y曲线Y因子及相应的p-y关系。为了说明分析方法的可行性，进行了桩靴贯入砂土时对邻近单桩和群桩相互作用影响的离心模型试验，方法预测与试验结果基本一致，从而验证了方法的合理性。对于文中的工况，桩靴贯入没有导致群桩p-y关系进一步弱化，此时采用桩靴贯入前的群桩p-y关系确定考虑桩靴贯入影响的群桩响应，得到的结果偏安全。
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| 关 键 词： | 修正的Poulos法 群桩效应 Poulos分析法 钻井船插桩 Y因子 |
| 收稿时间： | 2019-10-03 |
| 修稿时间： | 2019-12-30 |
Method to analyze the effect of spudcan penetration on an adjacent pile group |
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| FAN Yi-fei,WANG Jian-hua.Method to analyze the effect of spudcan penetration on an adjacent pile group[J].Rock and Soil Mechanics,2020,41(7):2360-2368. |
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| Authors: | FAN Yi-fei WANG Jian-hua |
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| Institution: | 1. State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, China;
2. Geotechnical Engineering Institute, Tianjin University, Tianjin 300072, China |
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| Abstract: | The modified Poulos method is universally used in design of laterally-loaded pile groups of platforms in current ocean engineering practices. However, given that increasing engineering cases have jack-up rigs with large-diameter spudcan foundations operating near a platform, the effects of spudcan penetration on the adjacent pile group should be evaluated. A pile group analysis method which is able to evaluate the effect of spudcan penetration on the pile group interaction is proposed in this paper. Single pile head deflections under the combined loading of spudcan penetration and the pile head load are firstly analyzed using the nonlinear foundation beam method. Then combining the effects of pile group interaction and nonlinear soil-pile interaction, the additional pile response due to the group effect is calculated through an elastic analysis. Finally, the pile group interaction Y-modifier is obtained by several pilot modifications of p-y curves of the single pile, whose variation during spudcan penetration indicates the effect of the spudcan penetration on the pile group interaction. Centrifuge model tests are conducted in sand to study the effect of spudcan penetration on adjacent a single pile and a pile group, respectively, and the proposed method is verified by comparison with predicted pile head deflections at different stages. In this case, the Y-modifier tends to decrease during spudcan penetration, and it can be inferred that the factor determined in the active loading stage is conservative enough in pile group analysis when considering spudcan penetration. |
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| Keywords: | modified Poulos method pile group analysis Poulos analysis method spudcan penetration Y-modifier |
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