Article
Engineering, Civil
Titi Sui, B. Mutlu Sumer, V. S. Ozgur Kirca, Stefan Carstensen, Jinhai Zheng, David R. Fuhrman
Summary: This paper presents the results of an experimental investigation on wave-induced liquefaction in the case of multiple wave exposures. The experiments show that the first strongest wave climate leads to liquefaction, regardless of prior wave exposures. It is also found that subsequent wave exposures do not liquefy the soil. Moreover, the dissipation of accumulated pore pressure is slower in uninterrupted wave exposures compared to interrupted ones.
COASTAL ENGINEERING
(2023)
Article
Engineering, Ocean
Chang-Fei Li, Yifa Wang, Fu-Ping Gao, Li-Jing Yang
Summary: This study investigates the spatiotemporal evolution of excess pore pressure in a silty seabed under progressive waves using a physical model in a large wave flume. The study identifies three stages in the process of residual liquefaction and proposes an amplification ratio as a new indicator for the onset of liquefaction. The study also highlights that silt beds are more prone to residual liquefaction compared to sand beds.
APPLIED OCEAN RESEARCH
(2022)
Article
Engineering, Marine
Lihua Wang, Jinfeng Zhang, Dong-Sheng Jeng, Qinghe Zhang, Tongqing Chen
Summary: Scouring and liquefaction are recognized as two major modes of seabed instability around marine structures. Wave experiments were conducted to investigate the dynamic response of a silty seabed. When the seabed was not covered with geotextile, it liquefied under the action of waves, accompanied by sediment incipience and suspension. Experimental results showed that liquefaction and scour promote each other.
Article
Engineering, Marine
Yuan Gao, Jisheng Zhang, Linlong Tong, Yakun Guo, Dennis Lam
Summary: Most previous studies focused on wave-induced pore pressure in sandy seabed liquefaction, while this study investigates the phenomenon in silty seabed. Experimental results show that residual pore pressure is the dominant factor causing liquefaction in silty soil. Buried pipelines experience liquefaction starting at the bottom and propagating vertically. The liquefaction potential is reduced when the pipeline is placed in a trench and backfilled.
Article
Engineering, Marine
Changjing Fu, Jinguo Wang, Tianlong Zhao
Summary: The research focuses on the cnoidal wave theory to describe nearshore wave characteristics. A simplified version of the cnoidal wave theory is presented, along with an analytical solution for pore water pressure and a theory of soil liquefaction caused by waves around buried pipelines. The theoretical results were verified through practical flume tests, demonstrating the feasibility of the proposed analytical method. The theory was further applied to analyze instant liquefaction of the seabed and pipeline stability in the Chengdao oilfield.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Jiangfeng Dong, Jishang Xu, Guangxue Li, Anlong Li, Shaotong Zhang, Jianwei Niu, Xingyu Xu, Lindong Wu
Summary: Seabed liquefaction and sediment resuspension under wave loading are coexisting and interacting processes. The excess pore pressure and wave-induced shear stress play key roles in sediment resuspension in both nonliquefaction and liquefaction scenarios.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Leiye Wu, Deqiong Kong, Bin Zhu, Renpeng Chen, Yunmin Chen
Summary: This paper describes a series of centrifuge tests conducted to investigate the behavior of clayey seabed under wave loading. The tests focused on three different types of soil response, with different levels of consolidation. Various sensors were used to measure pore pressure, soil strength, and motion of the liquefied layer. The study found significant development of residual pore pressure in unconsolidated and normally consolidated soils, while overconsolidated soils showed limited accumulation of residual pore pressure. The findings have important implications for offshore engineering practice.
Article
Engineering, Marine
Zhipeng Wan, Lin Cui, Dong-Sheng Jeng
Summary: The evaluation of wave-induced residual pore pressure in a porous seabed and associated seabed liquefaction is crucial for marine infrastructure design. Existing models for residual liquefaction do not consider the effect of oscillatory pore pressure on pore pressure acceleration, limiting their accuracy. This paper proposes a new model that couples both oscillatory and residual mechanisms, validated through flume and centrifuge tests. The proposed model significantly affects wave-induced seabed liquefaction potential, and a new criterion integrating both mechanisms is also introduced.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Qixiang Wang, Yupeng Ren, Ruichen Cao, Guohui Xu, Xianqing Lv
Summary: This study uses the MIT General Circulation Model (MITgcm) to simulate the pressure of liquefied soil during the initial stage of liquefaction in the Chengdao area of the Yellow River delta. Unlike previous studies, this research employs 32 linear waves as driving factors, which better represents actual wave conditions. By accurately reflecting pressure characteristics induced by wave groups, the study highlights the importance of physical factors in simulation accuracy and reliability. The findings provide valuable information for offshore engineers and researchers of soil liquefaction.
Article
Engineering, Marine
Xu Chen, Dong-Sheng Jeng, Zuodong Liang
Summary: This study investigates the wave-current induced liquefaction around two tandem pipes in a trench, and explores the effect of the horizontal gap ratio on the seabed response. Numerical simulations reveal that the position and configuration of the twin pipelines significantly impact the flow patterns and seabed response.
Article
Engineering, Civil
Jishang Xu, Jiangfeng Dong, Shaotong Zhang, Hongan Sun, Guangxue Li, Jianwei Niu, Anlong Li, Ping Dong
Summary: Wave-induced pore pressure in the seabed can lead to geohazards such as sub-marine landslides. Different components of waves have varying effects on the seabed response, with short waves decaying rapidly and long waves effectively propagating in the seabed. Low-frequency pore pressures propagate twice as effectively as high-frequency pore pressures. The contribution of long waves to cumulative pore pressure increases with soil depth. The use of statistical wave parameters to determine seabed pore pressure responses can underestimate liquefaction risk and lead to unsafe engineering designs.
COASTAL ENGINEERING
(2022)
Article
Engineering, Marine
Jianhong Ye, Kunpeng He
Summary: The study investigated the dynamics characteristics of submarine pipelines under hydrodynamic loading using a numerical model, with a focus on the behavior of the surrounding seabed soil. Results showed that the pipeline floats up due to increased buoyancy, but liquefaction did not occur in the surrounding soil.
Article
Engineering, Marine
Jie Lin, Dong-Sheng Jeng, Hongyi Zhao, Yuan Gao, Junwei Liu, Yakun Guo
Summary: This paper reviews the recent research progress on seabed liquefaction around marine structures under the combined wave and current loading. Two main research approaches are described, followed by a detailed discussion on two available liquefaction mechanisms and criteria. The development of wave and current-induced seabed liquefaction around marine structures is then presented. Furthermore, recently developed protection measures for structures and their surrounding seabed are summarized, and several future research perspectives are suggested.
Article
Geosciences, Multidisciplinary
Xingbei Xu, Guohui Xu, Junjie Yang, Zhongqian Xu, Yupeng Ren
Summary: Seabed liquefaction is an important form of seabed instability caused by storm waves, with pore pressure being a commonly used parameter to identify sediment liquefaction. Monitoring the pressure response of pore water at different depths can reveal the development and rate of seabed liquefaction.
GEO-MARINE LETTERS
(2021)
Article
Construction & Building Technology
Kai Zhao, Shengdong Zhu, Xiaoxiao Bai, Qiuzhe Wang, Su Chen, Haiyang Zhuang, Guoxing Chen
Summary: The paper investigates the significance of ocean environmental loads on seismic interactions between buried immersed tunnels and surrounding soil, proposing a fully coupled nonlinear effective stress analysis framework incorporating factors like ocean waves and currents. The study reveals that continuous disturbance from ocean wave and current has major consequences for seismic soil-structure interactions, highlighting the importance of considering environmental loads in seismic design practices for immersed tunnels.
TUNNELLING AND UNDERGROUND SPACE TECHNOLOGY
(2021)
Article
Engineering, Multidisciplinary
Mozhen Zhou, Qian Fang, Chong Peng
Summary: In this work, a segment-to-segment mortar frictionless contact method for total-Lagrangian smoothed particle hydrodynamics is presented. The method utilizes Lagrangian kernel, kernel gradient correction, and hourglass control to improve accuracy, convergence property, and stability. Two formulations, the node-to-segment and mortar segment-to-segment, are employed to solve contact problems, with different methods used to enforce contact constraints.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Engineering, Geological
Yong-Yong Wang, Song-Kui Sang, Ming-Yi Zhang, Dong-Sheng Jeng, Bing-Xiang Yuan, Zhi-Xiong Chen
Summary: Through laboratory model tests, the study explores the penetration mechanism of jacked piles in homogeneous cohesive soils. It is found that pile diameter and pile end form have significant influence on pile jacking resistance, while the influence of pile length is not obvious.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Environmental
Shaotong Zhang, Jinran Wu, You-Gan Wang, Dong-Sheng Jeng, Guangxue Li
Summary: In this study, water quality monitoring and hydrodynamic observation were conducted in the subaqueous Yellow River Delta in China. The study analyzed the suspended sediment concentration (SSC) time series and used a regression model to predict the SSC with high accuracy. This framework has the advantage of only relying on SSC and can be extended to forecast other signals with different periodicities.
Article
Water Resources
Shu-xin Wei, Zuo-dong Liang, Lin Cui, Hua-ling Zhai, Dong-sheng Jeng
Summary: This study used numerical simulation to analyze the process of seabed liquefaction under wave-current conditions. It was found that in the absence of current, the depth and range of the liquefaction area around the foundation increased and then decreased as the wave propagated. Under current conditions, the liquefaction depth was greater. Additionally, the study found that downstream piles were more prone to liquefaction than upstream piles in the presence of forward current.
WATER SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Zuodong Liang, Dong-Sheng Jeng
Summary: This paper presents a study on the physical processes involved in wave-seabed-mono-pile interactions using a three-dimensional numerical model. The study finds that the characteristics of ocean currents have a significant impact on wave run-up and the distribution of seabed liquefaction around piles. Additionally, the layout of the pile group affects the development of the near-trapping phenomenon. The study also suggests that using protection mattresses around the pile group is an effective option for reducing the potential of seabed liquefaction, which has not been considered in previous studies.
Article
Engineering, Marine
Yaqi Zhang, Jinran Wu, Shaotong Zhang, Guangxue Li, Dong-Sheng Jeng, Jishang Xu, Zhuangcai Tian, Xingyu Xu
Summary: In this study, scour experiments were conducted on both sandy and silty seabeds, and a rich dataset was established by combining data from literature. Based on this, two practical formulas for equilibrium scour depth were obtained using adaptive robust regression. These formulas showed good interpretations in physical meaning and outperformed commonly used models.
Article
Engineering, Marine
Zuodong Liang, Dong-Sheng Jeng, Junwei Liu, Jun Zhang
Summary: A numerical model is proposed in this paper to simulate the soil response around an offshore pipeline system under wave-current induction. Numerical examples show that using concrete mattresses can significantly reduce the liquefaction depth and improve the stability of the nearby seabed.
Article
Engineering, Marine
Linya Chen, Dong-Sheng Jeng
Summary: This study investigates the hydrodynamic response and seabed response around a dumbbell cofferdam under combined wave and current loading. The results show that the current has a significant effect on the dynamic force acting on the cofferdam, the dumbbell cofferdam affects the influence of the current on the pore-water pressures, and the liquefaction zone can be expanded with the superposition of the following current.
Article
Engineering, Civil
Xu Chen, Dong-Sheng Jeng
Summary: Seabed stability around submarine pipelines under wave-plus-current loading is a major concern in offshore projects. This study focuses on the seabed response around tandem pipelines and investigates the effect of gap ratios on the oscillatory response. Numerical examples and analysis reveal that the gap ratio significantly affects the soil response and liquefaction depth is influenced by multiple factors.
INTERNATIONAL JOURNAL OF OFFSHORE AND POLAR ENGINEERING
(2022)
Article
Engineering, Marine
Ling-Yu Xu, Wei-Yun Chen, Kai Zhao, Fei Cai, Jing-Zhe Zhang, Guo-Xing Chen, Dongsheng Jeng
Summary: The study developed a dynamic poro-elastoplastic seabed model and illustrated the elliptical trajectories of soil particles at different depths under progressive waves. The ratio of vertical displacement to horizontal displacement generally decreases with increasing depth in the poro-elastic seabed. Soil particles in the shallow part tend to move downwards before initial liquefaction, while those at lower positions initially move upwards and then downwards.
Article
Engineering, Marine
Xu Chen, Dong-Sheng Jeng, Zuodong Liang
Summary: This study investigates the wave-current induced liquefaction around two tandem pipes in a trench, and explores the effect of the horizontal gap ratio on the seabed response. Numerical simulations reveal that the position and configuration of the twin pipelines significantly impact the flow patterns and seabed response.
Article
Engineering, Marine
Lihua Wang, Jinfeng Zhang, Dong-Sheng Jeng, Qinghe Zhang, Tongqing Chen
Summary: Scouring and liquefaction are recognized as two major modes of seabed instability around marine structures. Wave experiments were conducted to investigate the dynamic response of a silty seabed. When the seabed was not covered with geotextile, it liquefied under the action of waves, accompanied by sediment incipience and suspension. Experimental results showed that liquefaction and scour promote each other.
Article
Engineering, Marine
Zhengxu Li, Dong-Sheng Jeng
Summary: For the design of breakwaters, the evaluation of wave-induced seabed response is crucial. Previous studies were limited to two dimensions, while this study developed a three-dimensional numerical model. The study compared two-layered detached breakwaters with conventional one-layered breakwaters and found that the two-layered breakwater had a greater wave dissipation ability due to a lower transmission rate. The consolidation process was also found to have a significant impact on seabed failure potential, emphasizing the importance of considering it in the design process.
Article
Engineering, Geological
Yifei Liu, Dong-Sheng Jeng, Heping Xie, Cunbao Li
Summary: Particle morphology is a fundamental property of granular geomaterials. This study introduces the Hilbert-Huang transform into morphology analysis and establishes a comprehensive descriptor system based on geometric measure theory. The characterization and corresponding program have the potential to be applied to any irregular geometry.
Review
Geosciences, Multidisciplinary
Runshen Wang, Dominic E. L. Ong, Mohammud I. Peerun, Dong-Sheng Jeng
Summary: The study of soil-structure interface behavior is important for understanding engineering performance and optimizing foundation design. Previous research has shown that surface roughness significantly affects interface shear performance in soil-structure interactions. This study used advanced instruments to investigate material surface roughness and validated a soil shearing model using digital imaging technology. Machine learning and numerical modeling have the potential to further advance research on interface shear mechanisms and enhance understanding of complex soil-structure interactions.
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.