Ocean Engineering最新文献_第6页

Explainable dual-point near-bit diagnostics for deepwater drilling anomalies: A deployable two-stage MI-AHP framework 可解释的深水钻井异常双点近钻头诊断：可部署的两级MI-AHP框架

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124710

Jiahao Zhan , Jun Li , Gonghui Liu , Hongwei Yang , Chao Wang , Biao Wang , Zhenyu Long

As deepwater drilling advances into increasingly narrow pressure margins, the available response time to well-control anomalies diminishes to just a few minutes. Conventional surface-only monitoring techniques often experience signal delays and attenuation along the drillstring, which hampers the early detection of disturbances near the drill bit. This study introduces a dual-point near-bit diagnostic framework designed to provide early anomaly warnings. Specifically, two downhole measurement locations are utilized to capture both synchronous responses and the transmission characteristics between points. A data-driven multi-indicator analytic hierarchy process (MI-AHP) is applied to derive interpretable feature weights by integrating multiple importance metrics obtained from an offline random forest model, facilitating efficient linear scoring. To address class imbalance, a two-stage cascade model is implemented: the first stage discriminates anomalies from seven normal conditions, while the second stage classifies four distinct anomaly types (kick, lost circulation, washout, and bit sticking). The proposed system was validated on data from fifteen deepwater wells, encompassing 1586.3 h and 22 anomaly events, achieving a Macro-F1 score of 93.4% for normal condition recognition, 91.2% for anomaly detection, and 89.8% for anomaly classification. Deployment on an ARM Cortex-M4 embedded platform requires only 78 ms and 125 KB of memory, supporting real-time downhole operation. In independent well testing, the system attained a Macro-F1 score of 90.5% with a false positive rate below 0.6%, successfully detecting a kick event 36 min prior to conventional surface-based identification methods.

随着深水钻井进入越来越窄的压力范围，对井控异常的可用响应时间缩短到几分钟。传统的地面监测技术通常会经历沿钻柱的信号延迟和衰减，这阻碍了对钻头附近干扰的早期检测。本研究引入了一个双点近钻头诊断框架，旨在提供早期异常预警。具体来说，利用两个井下测量位置来捕获同步响应和点之间的传输特性。采用数据驱动的多指标层次分析法（MI-AHP）对离线随机森林模型中得到的多个重要指标进行综合，得到可解释的特征权重，实现高效的线性评分。为了解决类不平衡问题，采用了两阶段的级联模型：第一级将异常从7种正常情况中区分出来，而第二级将4种不同的异常类型（井涌、井漏、冲蚀和卡钻）进行分类。该系统在15口深水井的数据上进行了验证，包括1586.3小时和22个异常事件，正常状态识别的Macro-F1得分为93.4%，异常检测得分为91.2%，异常分类得分为89.8%。在ARM Cortex-M4嵌入式平台上部署只需要78毫秒和125 KB内存，支持实时井下操作。在独立的井测试中，该系统的Macro-F1得分为90.5%，假阳性率低于0.6%，比传统的地面识别方法提前36分钟成功检测到井涌事件。

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引用次数: 0

Dynamic coupling mechanism and parametric study of mooring chain–seabed interaction based on a global-to-local nested modeling approach 基于全局到局部嵌套建模方法的系泊链-海床相互作用动力学耦合机理及参数化研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124701

Xiang Li , Qilin Yin , Kejiang Li , Zhiming Yuan , Yijun Zhou

In deepwater mooring systems, the dynamic interaction between anchor chains and the seabed is critical for controlling chain displacement and mooring anchor capacity, yet its complexity poses significant challenges for accurate simulation. This paper proposes a ‘global-to-local’ nested modeling framework to analyze chain-soil interaction under realistic ocean loads. First, a coupled model of floater-mooring-seabed is established, incorporating the influence of seabed soil properties on the mooring system. Then, using the time-varying loads at the truncation points of the coupled model as boundary conditions, a refined chain-soil model is developed using the coupled Eulerian-Lagrangian (CEL) method, defining the soil deformation patterns and chain configuration, displacement, and tension evolution of the chain during dynamic mooring. Consistency in load-displacement responses between models validates the feasibility of the nested modeling approach. Parametric studies show that the strain rate effect significantly enhances soil resistance and governs soil deformation patterns, while changes in soil ductility and sensitivity also considerably affect the trenching development and system response. This study provides a reliable numerical tool and theoretical basis for the accurate assessment of dynamic responses and safe design of deepwater mooring systems.

在深水系泊系统中，锚链与海底的动态相互作用是控制锚链位移和锚泊锚承载力的关键，但其复杂性给精确模拟带来了重大挑战。本文提出了一个“全局到局部”嵌套建模框架来分析现实海洋载荷下的链-土相互作用。首先，建立了浮子-系泊-海底耦合模型，考虑了海底土体特性对系泊系统的影响；然后，以耦合模型截断点处的时变载荷为边界条件，采用耦合欧拉-拉格朗日（CEL）方法建立了精细化的链-土模型，定义了动力系泊过程中土体的变形模式以及链的构型、位移和张力演化。模型间荷载-位移响应的一致性验证了嵌套建模方法的可行性。参数化研究表明，应变率效应显著增强了土体抗力，控制了土体变形模式，而土体延性和敏感性的变化也显著影响沟槽发育和系统响应。该研究为深水系泊系统动力响应的准确评估和安全设计提供了可靠的数值工具和理论依据。

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引用次数: 0

Anomaly diagnosis of dynamic cable state based on LSTM-SAE 基于LSTM-SAE的电缆动态状态异常诊断

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124652

Xu Zhang , Haowen Yao , Haolang He , Yurun Zhu , Jiayi Wang

Dynamic cables, a key component connecting floating platforms to static submarine cables, have significant economic implications for offshore wind projects when they fail. Therefore, accurate assessment of the operational status of dynamic cables and timely identification of potential faults are of great significance for ensuring the safe operation of offshore wind farms. In response to the technical challenge of the difficulty in detecting early micro-damage to dynamic cables, this study proposes a dynamic cable structural anomaly diagnosis method and diagnostic framework that integrates long short-term memory network (LSTM) and stacked auto-encoder (SAE). Based on real-time monitoring data, an extremum prediction algorithm is used to establish a dynamic threshold determination mechanism. Based on Marine environmental parameters, platform six-degree-of-freedom motion and dynamic cable tension information, a dynamic cable tension prediction model was constructed. According to the error between the true value and the predicted value, the abnormal diagnosis index of the dynamic cable in the normal state was calculated using the SAE method, and the diagnosis threshold was determined accordingly. Based on the real-time diagnostic indicators during the operation of the dynamic cable, the status of the dynamic cable is judged. This method can be used to accurately diagnose the status of dynamic cables when the degree of damage reaches more than 4%. The research results can effectively enhance the safety and reliability of the operation and maintenance of dynamic cables of floating wind turbines and provide theoretical basis and technical support for preventive maintenance.

动态电缆是连接浮动平台和静态海底电缆的关键部件，当它们发生故障时，对海上风电项目具有重大的经济影响。因此，准确评估动力电缆的运行状态，及时发现潜在故障，对于保证海上风电场的安全运行具有重要意义。针对动力电缆早期微损伤难以检测的技术挑战，本研究提出了一种长短期记忆网络（LSTM）和堆叠自编码器（SAE）相结合的动力电缆结构异常诊断方法和诊断框架。基于实时监测数据，采用极值预测算法建立动态阈值确定机制。基于海洋环境参数、平台六自由度运动和索张力动态信息，构建了索张力动态预测模型。根据真实值与预测值之间的误差，采用SAE方法计算动态电缆在正常状态下的异常诊断指标，并据此确定诊断阈值。根据动态电缆运行过程中的实时诊断指标，判断动态电缆的状态。该方法可在损伤程度达到4%以上时准确诊断动力索的状态。研究成果可有效提高浮式风力发电机组动索运行维护的安全性和可靠性，为预防性维护提供理论依据和技术支持。

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引用次数: 0

LADRC-based wake tracking control via sideslip angle estimation for AUVs following the trajectories of near-surface targets 基于ladrc的近水面目标尾迹跟踪控制

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-21 DOI: 10.1016/j.oceaneng.2026.124680

Weichao He , Zhaochen Meng , Yuanzheng Li , Peng Xu , Xingfu Wan , Jianhua Liu , Hao Jin , Kecheng Zhang , Guangming Xie , Minyi Xu

Autonomous underwater vehicles (AUVs) face considerable challenges in tracking the trajectories of near-surface targets due to nonlinear couplings, environmental disturbances, and pronounced sideslip effects, all of which significantly degrade the stability and accuracy of their control systems. In this paper, a wake-tracking control method is proposed for AUVs following the trajectories of surface targets. The controller integrates sideslip angle estimation with active disturbance rejection. A reduced-order extended state observer is constructed to estimate the real-time sideslip angle, representing the deviation between the vehicle's heading and its actual motion direction caused by wake-induced disturbances. Furthermore, a sideslip-estimation-based line-of-sight (LOS) guidance law is developed to generate coordinated yaw angle and surge velocity commands, thereby improving both directional control and speed regulation during wake tracking. Two linear active disturbance rejection controllers are subsequently designed to achieve decoupled and robust control of the yaw and surge channels. Simulation results demonstrate that the proposed method surpasses conventional LOS guidance and PID controllers integrated with disturbance observers in trajectory accuracy, lateral deviation suppression, convergence rate, and energy efficiency, thereby enabling stable and reliable wake tracking for AUVs in complex near-surface marine environments.

由于非线性耦合、环境干扰和明显的侧滑效应，自主水下航行器（auv）在跟踪近水面目标轨迹方面面临着相当大的挑战，这些都会显著降低其控制系统的稳定性和精度。本文提出了一种跟踪水面目标轨迹的水下机器人尾迹跟踪控制方法。该控制器将侧滑角估计与自抗扰相结合。构造了一个降阶扩展状态观测器来估计实时侧滑角，侧滑角表示尾迹干扰引起的车辆航向与实际运动方向之间的偏差。此外，提出了一种基于侧滑估计的视距制导律，生成协调的偏航角和浪涌速度命令，从而改善尾迹跟踪过程中的方向控制和速度调节。随后设计了两个线性自抗扰控制器，以实现对偏航和浪涌通道的解耦和鲁棒控制。仿真结果表明，该方法在弹道精度、横向偏差抑制、收敛速度和能量效率等方面均优于传统的LOS制导和PID控制器集成扰动观测器，能够实现复杂近水面海洋环境下auv稳定可靠的尾迹跟踪。

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引用次数: 0

An energy recovery device with variable damping for the Wave-Adaptive vehicle vibration control 一种用于车辆波动自适应振动控制的变阻尼能量回收装置

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-22 DOI: 10.1016/j.oceaneng.2026.124725

Penglei Ma , Lei Zhang , Bowen Qiao , Jing Cao , Bohuan Tan , Donghong Ning

This study presents the design of an electromagnetic variable damping (VD) device for wave-adaptive vessels, with the dual objectives of suppressing hull platform vibrations and demonstrating energy recovery (ER) capability. In contrast to conventional wave-adaptive vessel designs that predominantly employ springs and dampers, the proposed variable damping device is implemented as a linear motor equipped with resistance adjustment capability. By dynamically regulating the resistance of an external variable resistance module connected to the linear motor, the equivalent electromagnetic force generated by the VD device can be controlled in real time. Experimental tests validate the proposed model and accurately identify its key parameters. Subsequently, the variable damping device was integrated into a quarter-scale ship test platform to assess its feasibility. The wave-induced displacement of the ship raft, derived from hydrodynamic analysis, was applied as the excitation input. Experimental results demonstrate the device's outstanding performance: under a 60 kg hull load, the platform displacement is reduced by more than 60% compared to the excitation level, and the acceleration is decreased by 72.5%. The system achieves an electromagnetic power of 66.7 W, an output power of 35.2 W, and an electromagnetic efficiency of 0.547. This device not only broadens the application scope of variable dampers but also extends the research domain of semi-active control, showing significant potential in the field of vibration control.

本研究提出了一种用于波浪自适应船舶的电磁可变阻尼（VD）装置的设计，具有抑制船体平台振动和展示能量回收（ER）能力的双重目标。与传统的主要采用弹簧和阻尼器的波浪自适应船舶设计不同，所提出的可变阻尼装置是作为具有阻力调节能力的线性电机来实现的。通过动态调节与直线电机相连的外部可变电阻模块的电阻，可以实时控制VD装置产生的等效电磁力。实验验证了该模型的有效性，准确地识别了模型的关键参数。随后，将可变阻尼装置集成到1 / 4船舶试验平台中，以评估其可行性。采用由水动力分析得到的筏板波浪引起的位移作为激励输入。实验结果证明了该装置的优异性能：在60kg船体载荷下，平台的位移比激励水平降低了60%以上，加速度降低了72.5%。系统电磁功率为66.7 W，输出功率为35.2 W，电磁效率为0.547。该装置不仅拓宽了可变阻尼器的应用范围，而且拓展了半主动控制的研究领域，在振动控制领域显示出巨大的潜力。

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引用次数: 0

Impact load identification for stiffened ship hull plates using TSVD-GCV regularization 基于TSVD-GCV正则化的加劲船体板冲击载荷识别

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-23 DOI: 10.1016/j.oceaneng.2026.124530

Yahui Fu , Li Guo , Xinyi Yu , Yuchao Yuan , Wenyong Tang

Identification of transient impact loads on stiffened ship hull plates is critical for structural safety assessment, yet this is typically an ill-posed inverse problem. This paper proposes a time-domain load identification method based on the unit impulse superposition principle. A numerical-experimental hybrid strategy is employed, where impact tests on a stiffened plate model were systematically designed and conducted to acquire real strain responses, combined with the transfer matrix constructed via finite element simulations. To address the ill-posedness inherent in the inverse process, the Truncated Singular Value Decomposition (TSVD) method with the Generalized Cross-Validation (GCV) criterion is adopted. Furthermore, the influence of the calculation time step is investigated by defining a dimensionless ratio of the time step to the load rise time, and the optimal ratio balancing accuracy and stability is identified. Crucially, to mitigate the spatial correlation of structural responses, a sensor placement optimization strategy based on breaking spatial symmetry is proposed. By reducing information redundancy and the condition number of the transfer matrix, this asymmetric arrangement significantly enhances numerical stability. Experimental validation demonstrates that the proposed method achieves high accuracy in reconstructing the time histories of impact loads at different locations.

加强型船体板上瞬态冲击载荷的识别是结构安全评估的关键，但这通常是一个病态逆问题。提出了一种基于单位脉冲叠加原理的时域载荷识别方法。采用数值-实验混合策略，系统地设计并进行了加筋板模型的冲击试验，以获取真实应变响应，并结合有限元模拟构建的传递矩阵。为了解决逆过程固有的病态性，采用了基于广义交叉验证准则的截断奇异值分解（TSVD）方法。此外，通过定义时间步长与负载上升时间的无因次比值，研究了计算时间步长对负载上升时间的影响，确定了最优的比例平衡精度和稳定性。为了减轻结构响应的空间相关性，提出了一种基于打破空间对称性的传感器布局优化策略。通过减少传递矩阵的信息冗余和条件个数，这种不对称排列方式显著提高了数值稳定性。实验验证表明，该方法在重建不同位置的冲击载荷时程时程时具有较高的精度。

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引用次数: 0

Study on the enhancement of wave energy capture performance of Savonius hydrokinetic turbines using rear-mounted curved deflectors 后置弯曲导流板提高萨伏纽斯水轮机波浪能捕获性能的研究

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-23 DOI: 10.1016/j.oceaneng.2026.124622

Fengshen Li , Weixin Yang , Renwei Ji , Claes Eskilsson , Hanbin Gu , Congjie Ren , Ruiyin Song

Savonius-type hydrokinetic turbines (SHTs), recognized for their self-starting capability and structural simplicity, have recently been explored as candidates for wave energy conversion (WEC). However, their inherently low energy capture efficiency (ECE) remains a significant barrier to practical application. To address this challenge, a rear-mounted curved deflector—specifically designed to accommodate the circular or elliptical trajectories of wave-induced flows—was investigated for its potential to enhance SHT performance in complex wave environments. A combination of wave flume experiments and computational fluid dynamics (CFD) simulations was employed to systematically assess the influence of deflector parameters, including horizontal offset (x/D), vertical submergence (y/D), and coverage angle (0°–72°), on flow modulation and turbine torque. Results indicate that the rear-mounted deflector increases the maximum energy conversion efficiency by 31.7% across a range of wave conditions, demonstrating robust adaptability. Mechanistic analysis further reveals that maintaining the integrity of the terminal deflector section is essential for sustaining Venturi-induced pressure gains and reverse vortex shielding. These findings not only demonstrate the effectiveness of rear-mounted deflector configurations but also provide practical design guidance, supporting the advancement of SHTs as a promising new approach to wave energy conversion.

savonius型水动力涡轮机（SHTs）因其自启动能力和结构简单而被认可，最近被探索作为波浪能转换（WEC）的候选。然而，它们固有的低能量捕获效率（ECE）仍然是实际应用的重大障碍。为了应对这一挑战，研究人员研究了一种专门设计用于适应波浪诱导流动的圆形或椭圆形轨迹的后置弯曲偏转器，以提高其在复杂波浪环境下的SHT性能。采用波浪水槽实验和计算流体动力学（CFD）模拟相结合的方法，系统地评估了偏转板参数(包括水平偏移量（x/D）、垂直淹没度（y/D）和覆盖角（0°-72°）对流动调制和涡轮扭矩的影响。结果表明，后置偏转板在一系列波浪条件下的最大能量转换效率提高了31.7%，具有较强的适应性。机理分析进一步表明，保持末端偏转段的完整性对于维持文丘里诱导的压力增益和反向涡屏蔽至关重要。这些发现不仅证明了后置偏转板配置的有效性，而且提供了实用的设计指导，支持sht作为波能转换的新方法的发展。

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引用次数: 0

Prediction of FOWT mooring tension during non-stationary typhoon transit: a Transformer based framework with Bayesian optimization 非静止台风过境时fot系泊张力预测：基于变压器的贝叶斯优化框架

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-21 DOI: 10.1016/j.oceaneng.2026.124758

Gang Ma , Hairui Jiang , Hailong Chen , Ke Sun , Jianhua Zhang , Huaisong Yang

The dynamic evolution of typhoons is marked by pronounced non-stationarity and extreme nonlinearity, featuring rapid wind speed fluctuations that critically threaten the structural integrity of Floating Offshore Wind Turbines (FOWT). Conventional steady-state simulations frequently inadequately represent the transient coupling effects induced by a rapidly transiting typhoon. Therefore, a 12-h non-stationary typhoon model is developed to explicitly capture the continuous “approach-peak-decay” lifecycle, thereby ensuring physical consistency in the simulated aerodynamic load response. Furthermore, a deep learning framework is developed to collaborate Transformer architecture with Gaussian process-based Bayesian optimization (GP-BO) strategy. The framework leverages mooring tension response data generated throughout the entire non-stationary typhoon transit to train and construct a high-precision surrogate model. Comparative analysis with the traditional Long Short-Term Memory with Self-Attention mechanism (LSTM-SA) model demonstrates that the established predictive model exhibits exceptional generalization capability, enabling accurate prediction of dynamic responses under previously unencountered sea conditions, with a correlation coefficient exceeding 0.90 against true values. This research provides a highly efficient and reliable surrogate modeling approach for the real-time safety monitoring and design optimization of FOWT mooring systems under extreme meteorological conditions.

台风的动力演化具有明显的非平稳性和极端非线性特征，风速的快速波动严重威胁着海上浮式风力发电机组的结构完整性。传统的稳态模拟往往不能充分反映快速移动的台风所引起的瞬态耦合效应。因此，开发了一个12小时的非平稳台风模型，以明确捕获连续的“接近-峰值衰减”生命周期，从而确保模拟的气动载荷响应的物理一致性。此外，还开发了一个深度学习框架，将Transformer架构与基于高斯过程的贝叶斯优化（GP-BO）策略协同使用。该框架利用在整个非静止台风过境过程中生成的系泊张力响应数据来训练和构建高精度代理模型。与传统的LSTM-SA （Long - short Memory with Self-Attention mechanism）模型的对比分析表明，所建立的预测模型具有出色的泛化能力，能够准确预测以前未遇到的海况下的动态响应，与真实值的相关系数超过0.90。该研究为极端气象条件下FOWT系泊系统的实时安全监测和设计优化提供了一种高效可靠的代理建模方法。

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引用次数: 0

PSO algorithm -improved particle breakage model for calcareous sands based on breakage energy 基于破碎能量的粒子群算法改进钙质砂颗粒破碎模型

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-19 DOI: 10.1016/j.oceaneng.2026.124698

Wei Li , Wenpeng Liu , Junbiao He , Jingli Chen , Alisher Imanov , Nan Zhang

Establishing appropriate breakage constitutive models to predict soil behaviors of calcareous sand holds significant importance for marine geotechnical engineering. However, the majority of existing breakage constitutive models employ the breakage index derived from changes in particle size distribution. This method cannot capture the continuous evolution of particle breakage. To address this issue, this paper calculated the particle breakage energy

E_{B}

of calcareous sand based on the stress-dilatancy breakage model framework to characterize particle breakage. The Particle Swarm Optimization (PSO) algorithm was used to rapidly calibrate the initial friction angle

ϕ_{f}

. The

ϕ_{f}

and

E_{B}

were incorporated into the extended modified Mohr-Coulomb model considering particle breakage (MMC-PB). A nonlinear evolution equation was proposed to simulate the hardening-softening behavior of soil. This paper established a novel PSO-improved breakage model for calcareous sand based on particle breakage energy (PSO-MMC-PBE). The model was implemented in the finite element (FE) software ABAQUS to simulate the triaxial compression of calcareous sand and compared with test results. The comparison results show that this model can effectively simulate the stress-strain behavior of calcareous sand and capture the micro-breakage process. The model provides a potential approach for the numerical assessment of the stability of structures on calcareous sand.

建立合适的断裂本构模型来预测钙质砂的土性，对海洋岩土工程具有重要意义。然而，现有的破坏本构模型大多采用由粒径分布变化得出的破坏指数。这种方法无法捕捉到颗粒破碎的连续演化过程。针对这一问题，本文基于应力-剪胀破坏模型框架计算钙质砂的颗粒破碎能EB，表征颗粒破碎。采用粒子群优化（PSO）算法快速标定初始摩擦角；考虑颗粒破碎的扩展修正Mohr-Coulomb模型（MMC-PB）中加入了f和EB。提出了一个非线性演化方程来模拟土体的硬化-软化行为。本文建立了一种基于颗粒破碎能的PSO-MMC-PBE模型。利用有限元软件ABAQUS对钙质砂的三轴压缩进行了模拟，并与试验结果进行了比较。对比结果表明，该模型能有效地模拟钙质砂的应力-应变行为，捕捉到细碎过程。该模型为钙质砂土结构稳定性的数值评价提供了一种可能的方法。

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引用次数: 0

A theoretical approach for axial compressive analysis of helical piles supporting offshore jacket structures 支撑海上导管结构的螺旋桩轴压分析的理论方法

IF 5.5 2区工程技术 Q1 ENGINEERING, CIVIL

Ocean Engineering

Pub Date : 2026-04-30 Epub Date: 2026-02-20 DOI: 10.1016/j.oceaneng.2026.124602

Xiaodong Shao , Wenbing Wu , Xiaodong Gao , Meijuan Xu , Yunpeng Zhang , M. Hesham El Naggar , Hao Liu

Helical piles are extensively employed to support offshore jacket structures and withstand lateral loads through a push-pull mechanism. Nevertheless, there is still a dearth of research on their compressive capacity associated with settlement, especially for multi-helix piles. This limitation impedes the advancement of response-based design methodologies. To address this gap, this study presents a comprehensive unified theoretical framework for analyzing the axial compressive response of multi-helix piles associated with both individual bearing mode and cylindrical shear mode. The analysis framework is based on two key components: (1) a multi-fictitious soil pile model that model effectively integrating the two distinct bearing mechanisms, and (2) a semi-analytical solution for helical pile response derived using the transfer matrix method. Validation against several reported cases demonstrates that the proposed method provides a reliable tool for predicting the axial compressive behavior of helical piles across diverse scenarios, ensuring its applicability to practical engineering design. Furthermore, parametric studies offer valuable insights into the factors influencing pile response and provide practical guidelines for optimizing helix spacing design. This study contributes to advancing the understanding of helical pile behavior and supports the development of more efficient and reliable design methodologies for offshore helical piles.

螺旋桩广泛用于支撑海上导管架结构，并通过推拉机构承受侧向载荷。然而，对其抗压能力与沉降关系的研究仍然缺乏，特别是对多螺旋桩的抗压能力的研究。这种限制阻碍了基于响应的设计方法的发展。为了解决这一问题，本研究提出了一个全面统一的理论框架来分析多螺旋桩在个体承载模式和柱剪模式下的轴压响应。该分析框架基于两个关键组成部分：(1)有效整合两种不同承载机制的多虚拟土桩模型；(2)利用传递矩阵法导出螺旋桩响应的半解析解。对几个已报道的案例的验证表明，所提出的方法为预测螺旋桩在不同情况下的轴压行为提供了可靠的工具，确保了其在实际工程设计中的适用性。此外，参数化研究对影响桩响应的因素提供了有价值的见解，并为优化螺旋间距设计提供了实用指导。该研究有助于提高对螺旋桩行为的理解，并支持开发更有效和可靠的海上螺旋桩设计方法。

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引用次数: 0