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学者姓名：曹光伟
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Abstract ：
目前现浇X形桩(XCC桩)的研究主要集中于黏土地基，而对于砂土中XCC桩的相关研究却很少；此外，在研究XCC桩贯入问题时，主要分析的是沉桩挤土效应，而忽略了实际工程施工中挤土位移荷载会对邻近既有桩产生附加桩身响应这一关键问题。为此，利用耦合的欧拉-拉格朗日(CEL)大变形数值技术，建立了相邻贯入XCC桩-砂土-既有XCC桩的整体CEL有限元数值模型，并且将数值结果与室内模型试验测量数据进行比较，验证了CEL数值技术在分析相邻XCC桩-土体-既有XCC桩相互作用的可行性和有效性。然后，开展了一系列参数研究，探讨了贯入深度、相邻桩与既有桩的间距、既有桩桩头边界条件等因素对既有桩侧向响应的影响。最后，基于参数分析的结果，编制了一套可用于岩土工程师在设计初期阶段评估相邻XCC桩贯入引起的既有XCC桩最大侧向响应的设计图，以减轻桩基施工带来的相关风险。
Keyword ：
CEL大变形数值技术 CEL大变形数值技术 XCC桩 XCC桩 侧向响应 侧向响应 砂土 砂土 设计图 设计图 路基工程 路基工程
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| GB/T 7714 | 周鹏 , 夏良利 , 刘汉龙 et al. 基于CEL法的砂土中相邻XCC桩贯入对既有XCC单桩影响的研究 [J]. | 中国公路学报 , 2024 , 37 (04) : 141-154 . |
| MLA | 周鹏 et al. "基于CEL法的砂土中相邻XCC桩贯入对既有XCC单桩影响的研究" . | 中国公路学报 37 . 04 (2024) : 141-154 . |
| APA | 周鹏 , 夏良利 , 刘汉龙 , 徐长节 , 崔杰 , 曹光伟 et al. 基于CEL法的砂土中相邻XCC桩贯入对既有XCC单桩影响的研究 . | 中国公路学报 , 2024 , 37 (04) , 141-154 . |
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Abstract ：
目的：在实际工程施工过程中，由于XCC桩属于挤土桩，其安装或沉桩过程将使桩周土体产生变形，而这种挤土荷载（尤其是侧向挤土位移）会对既有桩施加附加的桩身响应，从而导致桩基破坏。本文旨在探讨砂土中相邻XCC桩贯入对既有XCC桩的影响，研究贯入过程中不同土体相对密实度和既有桩截面几何形状的情形下既有桩侧向响应及桩周土体应力的发展规律。创新点：1.探讨了相对密实度和截面几何形状对既有桩侧向响应的影响；2.揭示了贯入过程中既有桩桩周土体应力变化规律。方法：1.基于沉桩加载模型试验系统，开展一系列砂土中相邻XCC桩贯入对既有XCC桩影响的1g模型试验；2.考虑土体相对密实度和既有桩截面几何效应的影响，获得砂土中相邻XCC桩贯入过程中既有XCC桩的侧向响应以及桩周土体应力变化的趋势。结论：1.既有XCC桩侧向响应对相对密实度和截面几何效应的变化很敏感，主要表现为既有XCC桩的弯矩随着它们的增加而增大；2.既有XCC桩周围不同深度的土体径向应力随贯入深度的变化呈现出不同的发展趋势，而且由于既有桩的遮挡效应，土体的径向应力的变化不再表现出“h/R效应”；3.径向应力峰值σ'_(r＿max)/σ'_(v0)随着径向距离r/R的增加而以指数函数的形式减小，松砂中σ'_(r＿max)/σ'_(v0)随r/R的衰减指数要大于中密砂和密砂中的衰减指数。
Keyword ：
XCC桩 XCC桩 侧向响应 侧向响应 径向应力 径向应力 模型试验 模型试验 贯入 贯入
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| GB/T 7714 | 周鹏 , 徐建辉 , 徐长节 et al. 砂土中相邻现浇X形混凝土（XCC）桩贯入对既有XCC桩的影响研究（英文） [J]. | Journal of Zhejiang University-Science A(Applied Physics & Engineering) , 2024 , 25 (07) : 557-573 . |
| MLA | 周鹏 et al. "砂土中相邻现浇X形混凝土（XCC）桩贯入对既有XCC桩的影响研究（英文）" . | Journal of Zhejiang University-Science A(Applied Physics & Engineering) 25 . 07 (2024) : 557-573 . |
| APA | 周鹏 , 徐建辉 , 徐长节 , 曹光伟 , 崔杰 , 丁选明 . 砂土中相邻现浇X形混凝土（XCC）桩贯入对既有XCC桩的影响研究（英文） . | Journal of Zhejiang University-Science A(Applied Physics & Engineering) , 2024 , 25 (07) , 557-573 . |
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At present, research on XCC piles has mainly focused on clay foundations; however, there has been little research on XCC piles in sand. In addition, the compaction effect of a pile had been mainly analyzed when the penetration of the XCC pile was studied, while ignoring the key problem that these compaction displacement loads produce additional pile responses to adjacent existing piles in actual engineering constructions. Therefore, this study adopted a Coupled Eulerian-Lagrangian (CEL) large deformation numerical technique for establishing an integrated CEL finite element numerical model of an adjacent XCC pile-sand-existing XCC pile. The numerical results were compared with the measured data from indoor model tests, which verified the feasibility and validated the CEL numerical technique for analyzing adjacent XCC pile-soil-existing XCC pile interactions. Subsequently, a series of parametric studies were performed to explore the influences of the penetration depth, spacing between adjacent piles and existing piles, and boundary conditions of the existing pile head on the lateral response of the existing pile. Finally, based on the results of the parametric analysis, a set of design charts that can be used by geotechnical engineers to evaluate the maximum lateral response of existing XCC piles caused by the penetration of adjacent XCC piles at the early design stage were developed to mitigate the risks associated with pile foundation construction. © 2024 Chang'an University. All rights reserved.
Keyword ：
Compaction Compaction Geotechnical engineering Geotechnical engineering Numerical methods Numerical methods Piles Piles Risk assessment Risk assessment
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| GB/T 7714 | Zhou, Peng , Xia, Liang-Li , Liu, Han-Long et al. Study on the Influence of Adjacent XCC Pile on Existing XCC Single Pile in Sand Based on CEL Method [J]. | China Journal of Highway and Transport , 2024 , 37 (4) : 141-154 . |
| MLA | Zhou, Peng et al. "Study on the Influence of Adjacent XCC Pile on Existing XCC Single Pile in Sand Based on CEL Method" . | China Journal of Highway and Transport 37 . 4 (2024) : 141-154 . |
| APA | Zhou, Peng , Xia, Liang-Li , Liu, Han-Long , Xu, Chang-Jie , Cui, Jie , Cao, Guang-Wei et al. Study on the Influence of Adjacent XCC Pile on Existing XCC Single Pile in Sand Based on CEL Method . | China Journal of Highway and Transport , 2024 , 37 (4) , 141-154 . |
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