Article
Engineering, Marine
Yiliang Yu, Xiaohua Bao, Zhipeng Liu, Xiangsheng Chen
Summary: This study numerically simulated the CST test of a four-pile group in saturated sand soil using a water-soil fully coupled dynamic FE-FD method. The results showed that the interaction between the pile and soil as well as the pile volume effect were the key factors affecting the dynamic response in liquefiable soils.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Geological
Bin Gao, Wenxuan Zhu, Qi Zhang, Guanlin Ye
Summary: This study investigates the performance of offshore wind turbines supported by suction bucket foundation in liquefiable sand under wind and earthquake loads. Various factors affecting the seismic responses of the foundation are analyzed, and the responses of the turbines under wind and earthquake loads are evaluated using several parameters.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2022)
Article
Engineering, Geological
Mohammad Arabpanahan, Seyed Rasoul Mirghaderi, Abdollah Hosseini, Abbas Ghalandarzadeh
Summary: This paper investigates the dynamic behavior of rocking foundation systems with different embedment depths through shake table tests. The results show that rocking isolation can reduce the transferred acceleration to the superstructure under moderate and strong excitations. Additionally, the influence of successive excitations on residual rocking stiffness and other parameters is explored.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Marine
Junwei Liu, Shuiyue Chen, Xin Li, Zuodong Liang
Summary: This study investigates the fluid-seabed-structure interactions around an open-ended pile using a solver established on the open-source CFD platform and Biot's poro-elastic theory. The analysis reveals that the wave period, degree of seabed saturation, and pile diameter significantly affect the development of transient seabed liquefaction depth around the pile. Additionally, the distribution of pore water pressure vs soil depth in the inner zone of the pile presents a V shape rotated 90 degrees counterclockwise.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2021)
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
Chenglin Liu, Titi Sui, Jisheng Zhang, Chi Zhang
Summary: This study developed an integrated numerical model to investigate the dynamic response of the seabed around tripod turbine foundations. The presence of tripods was found to significantly affect the consolidation results of the seabed. The arrangement of the tripods also influenced the wave force acting on the structure, with an asymmetrical 15 degrees arrangement increasing the maximum liquefaction depth of the seabed.
Article
Engineering, Ocean
Lin Cui, Dong-Sheng Jeng, Junwei Liu
Summary: In this study, a 3D model is used to investigate fluid-seabed-structure interactions around offshore detached breakwaters, focusing on long term cyclic loading induced seabed response and liquefaction potential. It is found that longshore currents exacerbate the risk of liquefaction of seabed foundation.
APPLIED OCEAN RESEARCH
(2021)
Article
Engineering, Marine
Tianhao Wang, Qi Zhang, Bin Yan, Wenxuan Zhu, Guanlin Ye
Summary: This study analyzed the effects of pile leg insertion depth and soil shear strength gradient on the bearing capacity of pile leg-mat foundation. The results showed that the pile leg insertion depth significantly enhanced the horizontal bearing capacity of the foundation, while the improvement on vertical and moment bearing capacity was not significant.
Article
Computer Science, Interdisciplinary Applications
Bin Gao, Guanlin Ye, Qi Zhang, Wenxuan Zhu, Lulu Zhang
Summary: This study investigates the seismic response of laterally-loaded suction bucket foundations in random soil using an advanced constitutive model and FE-FD method. The seismic responses are described using Monte Carlo simulation and FE-FD method, and statistics of tilt and liquefaction potential index are investigated. It is found that the underestimation of tilt and liquefaction can be avoided by considering the spatial variability of soil.
COMPUTERS AND GEOTECHNICS
(2023)
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
Richard Asumadu, Jisheng Zhang, Hubert Osei-Wusuansa
Summary: Investigation and analysis of wave-seabed-structure interaction is crucial in marine engineering design and construction. This study establishes an integrated numerical model to simulate the wave-induced oscillatory seabed response around offshore substructure foundations. The model is validated through comparison with previous experimental data, demonstrating its reliability. Results show that liquefaction depth tends to be larger in the offshore and lateral areas of the upstream axillary pile leg.
Article
Engineering, Marine
Weiyun Chen, Yujie Jiang, Lingyu Xu, Chao Liu, Guoxing Chen, Piguang Wang
Summary: Due to their capability of producing clean and green energy, there is an increasing number of offshore wind turbines (OWTs) constructed globally. Many of these structures are located in earthquake-prone areas with the risk of soil liquefaction. This study investigates the dynamic behavior of the hybrid pile-bucket foundation supporting OWTs in liquefiable soils under earthquake loads. Two three-dimensional (3D) numerical models are established to compare the performance of a 5-MW offshore wind turbine supported by a monopile foundation and a pile-bucket foundation in liquefiable soils using the open-source software OpenSees. The results show that the hybrid pile-bucket foundation can significantly decrease the seismic responses of the OWTs and increase the liquefaction resistance of the surrounding seabed, compared with the monopile foundation.
Article
Engineering, Civil
Yang Lu, Feng Xiong, Qi Ge
Summary: A new design philosophy called rocking isolation is proposed for seismic protection of structures by utilizing nonlinear foundation response, which allows structures to rock on their foundation to limit seismic actions. An improved Winkler-based rocking foundation model is introduced to calculate the dynamic response of a rocking isolation system, with enhancements in describing the point-wise constitutive relation between tractions and displacements at the base. The model is calibrated and validated against experimental and numerical simulation data, providing analytical expressions for foundation rocking stiffness and failure envelope.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2021)
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
Construction & Building Technology
Weihong Huang, Jiankun Liu, Heng Wang, Mo'men Ayasrah, Hongsheng Qiu, Zhuofan Wang
Summary: This paper investigates the dynamic response and parameter influence law of an inclined straight pile group foundation under earthquake action. The study finds that the inclination angle of inclined piles has a significant influence on the seismic ability of pile group foundations.
Article
Engineering, Ocean
Shuo Zhang, Guanlin Ye, Chencong Liao, Jianhua Wang
APPLIED OCEAN RESEARCH
(2018)
Article
Engineering, Ocean
Dagui Tong, Chencong Liao, Deng-Sheng Jeng, Jianhua Wang
APPLIED OCEAN RESEARCH
(2018)
Article
Engineering, Ocean
Ya-Guang Wang, C. C. Liao, J. H. Wang
APPLIED OCEAN RESEARCH
(2018)
Article
Engineering, Ocean
H. -Y Zhao, D. -S. Jeng, C. -C. Liao, J. -S. Zhang, Z. Guo, W. -Y. Chen
APPLIED OCEAN RESEARCH
(2018)
Article
Engineering, Marine
Y. -G. Wang, C. C. Liao, J. -H. Wang, W. Wang
Article
Engineering, Ocean
Wei-Yun Chen, Guo-Xing Chen, Wei Chen, Chen-Cong Liao, Hong-Mei Gao
MARINE GEORESOURCES & GEOTECHNOLOGY
(2019)
Article
Engineering, Ocean
C. C. Liao, Yaguang Wang, Jinjian Chen, Qi Zhang
MARINE GEORESOURCES & GEOTECHNOLOGY
(2019)
Editorial Material
Engineering, Ocean
C. C. Liao
MARINE GEORESOURCES & GEOTECHNOLOGY
(2019)
Article
Computer Science, Interdisciplinary Applications
Dagui Tong, Chencong Liao, Jinjian Chen
COMPUTERS AND GEOTECHNICS
(2019)
Article
Environmental Sciences
Dong-Sheng Jeng, Linya Chen, Chencong Liao, Dagui Tong
JOURNAL OF COASTAL RESEARCH
(2019)
Article
Engineering, Geological
Ming-Guang Li, Jin-Jian Chen, Ye-Shuang Xu, Da-Gui Tong, Wei-Wei Cao, Yu-Jin Shi
Summary: This study investigates the effects of groundwater exploitation on land subsidence and infrastructure settlement in Shanghai, China, based on long-term measurement data. The subsidence pattern can be roughly divided into three phases, with subsidence funnels possibly occurring. The towers of Nanpu Bridge may experience the main reason for the bridge's differential settlement within the subsidence funnel.
ENGINEERING GEOLOGY
(2021)
Article
Engineering, Geological
Dagui Tong, Chencong Liao, Jinjian Chen
Summary: A hydro-mechanical model is established to investigate the monopile-seabed interaction in cross-anisotropic sandy seabed under wave loadings, considering the nonlinear behaviors of slip and separation between monopile and soil. The results show that increasing seabed anisotropy leads to a decrease in vertical coefficient of permeability, an increase in vertical elastic modulus and shear modulus, and a decrease in Poisson's ratio. These effects have implications on excess pore water pressure, momentary liquefaction, lateral displacement, bending moment, and wave-induced settlement of monopiles.
GEOMECHANICS AND GEOENGINEERING-AN INTERNATIONAL JOURNAL
(2023)
Article
Engineering, Marine
Linya Chen, Dong-Sheng Jeng, Chencong Liao, Dagui Tong
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2019)
Article
Engineering, Marine
Dagui Tong, Chencong Liao, Jinjian Chen, Qi Zhang
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2018)
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.