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我国近海地震频发,地震作用对海上风电基础与风机结构的稳定性影响大.为了准确有效地计算海上风电结构地震动力响应,该文根据波动理论和斯奈尔定律,推导了基于黏弹性人工边界的三维成层土地震等效节点力计算公式,并验证了其准确性.在此基础上,以福建莆田某风电场地基为例,建立5 MW风机-单桩-成层海床三维一体化数值分析模型,进行了地震作用下的海上风电动力响应分析.研究表明:当地震发生时,地基中不同位置的土体响应不同,对于浅层桩周土体,距离桩基越近,土体加速度响应越小,桩基会对浅层桩周土体的加速度有一定抑制作用;桩基对不同深度的土层剪应变影响也相差较大.对于风机结构而言,最大位移发生在塔架顶部,最大加速度和最大应力发生在塔架中部.
Keyword ：
单桩式海上风电 单桩式海上风电 地震响应 地震响应 成层地基 成层地基 等效节点力 等效节点力 黏弹性人工边界 黏弹性人工边界
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| GB/T 7714 | 陈志波 , 刘海波 , 曹光伟 et al. 基于黏弹性人工边界的成层地基中海上风机地震响应分析 [J]. | 振动与冲击 , 2025 , 44 (3) : 291-300,308 . |
| MLA | 陈志波 et al. "基于黏弹性人工边界的成层地基中海上风机地震响应分析" . | 振动与冲击 44 . 3 (2025) : 291-300,308 . |
| APA | 陈志波 , 刘海波 , 曹光伟 , 何奔 , 曾旭明 , 潘生贵 . 基于黏弹性人工边界的成层地基中海上风机地震响应分析 . | 振动与冲击 , 2025 , 44 (3) , 291-300,308 . |
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An integrated model of an offshore wind turbine (OWT) which incorporates wind turbine-water-pile-soil interactions and cyclic/dynamic behaviour of saturated clays with pore fluid pressure is introduced to study the dynamic behaviour of OWT monopiles in clay. Based on the integrated model, the influences of threedimensional (3D) seawater modelling and operational conditions on monopiles are investigated. The analysis results show that under wind-wave loads, the significant accumulation of excess pore pressure can be observed in the seabed soil, and use of the effective stress method involving excess pore pressure in integrated dynamic analyses of OWTs is essential. Compared to conventional added mass methods, the consideration of the 3D feature of the seawater leads to more intense dynamic responses, such as cumulative displacement, soil damping and pore pressure, and neglecting the 3D nature of seawater is non-conservative for the design of OWT monopile foundations. Furthermore, the value of the soil damping is affected by the actual effective stress state of soil and operational conditions, and using an empirical constant to determine the value of soil damping is questionable for the dynamic analysis of OWTs.
Keyword ：
3D modelling of seawater 3D modelling of seawater Excess pore pressure Excess pore pressure Integrated analysis Integrated analysis Monopile Monopile Operational condition Operational condition OWT OWT
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| GB/T 7714 | Cao, Guangwei , Ding, Xuanming , Chen, Zhibo et al. Dynamic hydro-mechanical response of offshore wind turbine monopiles in clay based on an integrated analysis [J]. | OCEAN ENGINEERING , 2024 , 313 . |
| MLA | Cao, Guangwei et al. "Dynamic hydro-mechanical response of offshore wind turbine monopiles in clay based on an integrated analysis" . | OCEAN ENGINEERING 313 (2024) . |
| APA | Cao, Guangwei , Ding, Xuanming , Chen, Zhibo , Zhou, Peng , Jiang, Chunyong . Dynamic hydro-mechanical response of offshore wind turbine monopiles in clay based on an integrated analysis . | OCEAN ENGINEERING , 2024 , 313 . |
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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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The response characteristics of large-diameter monopiles under lateral loads greatly differ from those of traditional small-diameter piles. By means of transparent soil and centrifuge tests, as well as numerical analyses, the soil flow mechanism and lateral behavior of large-diameter monopiles in soft clay were investigated. The study result reveals that a rotational failure mechanism, different from wedge-full-flow mechanisms, exists in the large-diameter monopile-soil system. For stubby large-diameter monopiles, using the classic wedge-full-flow mechanisms can lead to an overestimation of lateral capability due to its absence in considering the rotational mechanism. In addition, the normalized p-y curves in the rotational soil flow zone are also observed to have larger initial stiffness and attain yield plateau earlier than those in wedge-full-flow zone. Differences in Np values among different centrifuge tests are partly attributed to the different means of obtaining the clay's undrained shear strength. When the undrained strength from consolidated undrained triaxial tests is taken, consistent values of Np originating from different test results are observed. Finally, based on the results from centrifuge tests and well-calibrated numerical analyses, an empirical formulation of Np for large-diameter monopiles in soft clay is proposed.
Keyword ：
Centrifuge test Centrifuge test Large-diameter monopile Large-diameter monopile Lateral behavior Lateral behavior Numerical analysis Numerical analysis Soft clay Soft clay Transparent soil test Transparent soil test
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| GB/T 7714 | Cao, Guangwei , Chian, Siau Chen , Ding, Xuanming et al. Lateral behavior of large-diameter monopiles in clay using transparent soil and centrifuge tests [J]. | ACTA GEOTECHNICA , 2024 . |
| MLA | Cao, Guangwei et al. "Lateral behavior of large-diameter monopiles in clay using transparent soil and centrifuge tests" . | ACTA GEOTECHNICA (2024) . |
| APA | Cao, Guangwei , Chian, Siau Chen , Ding, Xuanming , Chen, Zhibo , Zhou, Peng . Lateral behavior of large-diameter monopiles in clay using transparent soil and centrifuge tests . | ACTA GEOTECHNICA , 2024 . |
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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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The bearing capacity and deformation behavior of coral sand foundations, a geotechnical structure commonly employed in coastal and island construction, are investigated in this study. Coral sand presents unique challenges due to its angularity and crushability, which affect interparticle interactions. Model tests and three-dimensional discrete-continuous coupled numerical simulations are performed to understand these complexities, focusing on the impacts of relative density, footing size and shape, and particle crushing on the foundation performance. The testing and numerical simulation data reveal that the bearing capacity of coral sand foundations significantly improves with increasing relative density and footing size. Compared with square footings, circular footings exhibit superior bearing performance at a 70% relative density. However, increased particle crushing reduces the bearing capacity. These findings are evaluated and compared with the theoretical ultimate bearing capacities. Intense crushing and occlusions are observed directly beneath the footing, with marked increases in particle fragments, microscopic contact forces, and coordination numbers within this core region. Additionally, the deformation analysis reveals a symmetrical failure pattern in the coral sand foundations. This study delves into the microscopic interactions between particle crushing and its influence on the bearing and settlement performance, offering insights into the interplay between crushing, stress, and deformation. © 2024 Elsevier Ltd
Keyword ：
Association reactions Association reactions Bearing capacity Bearing capacity Crushing Crushing Failure (mechanical) Failure (mechanical) Foundations Foundations Numerical models Numerical models Particle size analysis Particle size analysis Sand Sand
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| GB/T 7714 | Luo, Zhaogang , Ding, Xuanming , Zhang, Xihong et al. Experimental and numerical investigation of the bearing capacity and deformation behavior of coral sand foundations under shallow footing loads [J]. | Ocean Engineering , 2024 , 310 . |
| MLA | Luo, Zhaogang et al. "Experimental and numerical investigation of the bearing capacity and deformation behavior of coral sand foundations under shallow footing loads" . | Ocean Engineering 310 (2024) . |
| APA | Luo, Zhaogang , Ding, Xuanming , Zhang, Xihong , Ou, Qiang , Yang, Fengchun , Zhang, Ting et al. Experimental and numerical investigation of the bearing capacity and deformation behavior of coral sand foundations under shallow footing loads . | Ocean Engineering , 2024 , 310 . |
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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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