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Article
Engineering, Marine
Chenguang Liu et al.
Summary: As a new type of mineral resource, gas hydrate has attracted significant global attention. This seismic detection method is an important means of identifying gas hydrate by detecting abnormal phenomena such as BSR, blank zones, velocity anomalies, and polarity inversion. The current methods cannot meet the needs of shape and structure detection of gas hydrate deposits buried deep beneath the seabed in the South China Sea. With support from China's National Key R&D Program, breakthroughs in key technologies, such as ultra-high-energy plasma sources, small-group-interval high-resolution seismic streamers, and distributed three-dimensional seismic acquisition have been achieved. The seismic profile obtained in the north of the South China Sea demonstrates deep penetration with a depth of nearly 1000 m at 1500 m depth and vertical resolution better than 1.5 m, thus fulfilling the requirements for high-resolution exploration of gas hydrate resources.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Engineering, Marine
Ziyu Wang et al.
Summary: This study conducted a long-term cyclic loading test on calcareous sand from an island reef in the South China Sea under conditions of unequal consolidation and drainage. The axial cumulative strain and dynamic characteristics of the sand samples were studied, and a model prediction formula was established. The results showed that the axial cumulative strain and dynamic elastic modulus increased with increasing vibration times of cyclic load, while the dynamic damping ratio decreased. Several factors such as dynamic stress amplitude, load frequency, confining pressure, consolidation stress, compactness, and moisture content influenced the axial cumulative strain, elastic modulus, and damping ratio. The research findings are significant for understanding the long-term deformation and dynamic response of coral sand subgrade soil under cyclic vibration loads.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Peng Yu et al.
Summary: The study found that under cyclic shear in offshore structures, the shear stress at the silt-steel interface softens, and the overall deformation shows shear shrinkage. Additionally, with an increase in shear amplitude, as well as in normal stress and roughness, the interfacial shear strength increases.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Li Pang et al.
Summary: This paper explores the effect of an undrained clay slope on the initial stiffness of p-y curves for laterally loaded piles. Nonlinear models and analysis methods are proposed to determine the reduction factor for the undrained clay slope. Through finite-element analysis and semi-empirical methods, the paper derives the nonlinear formulations for the initial stiffness of hyperbolic p-y curves affected by the undrained clay slope. Compared with other studies, the results of this paper's model are more accurate and can be applied to a wider range of cases.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Qizhi Chen et al.
Summary: Difficulties related to seepage in deep-buried tunnels are common in tunnel design and construction. Most solutions assume the surrounding rock mass is homogeneous, but this study proposes analytical solutions considering anisotropic flow with a grouting ring. The solutions are verified using numerical simulations and parameter analysis. Results show that the seepage field in deep-buried circular tunnels is non-uniform and elliptical, and the permeability coefficient of the lining structure significantly affects the hydraulic head. The size of the grouting ring also has a significant impact on the grouting effect.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Review
Engineering, Marine
Zhigang Shan et al.
Summary: This article focuses on the evolution of submarine landslide disasters and proposes three stages of submarine landslide evolution. The evolution process of submarine landslide disasters is revealed through in-situ investigation, physical simulation, and numerical simulation. Additionally, the article points out current research deficiencies and future development directions in the field of submarine landslides.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Yujing Jiang et al.
Summary: This study investigates the effect of dynamic loading on the mechanical properties of gas-hydrate-bearing sediments using numerical tests and particle flow code. The loading frequency has a small effect on the stiffness, but a significant effect on the peak strength. The peak strength increases and then decreases with the increase in loading frequency. Under the same loading frequency, the peak strength increases with the increase in loading amplitude, while the stiffness decreases. The maximum shear expansion of the specimen is influenced by the movement of the phase change point and the rearrangement of particles.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Ying Yang et al.
Summary: The study focuses on the physical and mechanical properties of marine soil in the Shenhu sea area of the South China Sea, identifying it as high-plasticity silt with high water content and compressibility. A new stress-strain-normalized condition is proposed based on a hyperbola function, introducing the concept of a standard normalized factor. The research results can contribute to the design and construction of offshore engineering projects.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Chenzhe Li et al.
Summary: This study used a novel approach to analyze the hydrochemistry characteristics and health risks of groundwater in the Guangdong coastal areas, considering factors such as rock weathering, seawater intrusion, and anthropogenic inputs. The results showed that the groundwater had a high concentration of total dissolved solids and weakly alkaline quality. Most of the samples were acceptable for drinking, but there were unacceptable risks and higher health hazards for children in certain areas. The study suggests that attention should be paid to groundwater salinization and nitrate pollution when improving groundwater quality and exploring sustainable utilization of groundwater resources.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Zhongde Gu et al.
Summary: This study investigated the effect of temperature on the undrained shear strength of deep-sea clay. The results showed that as the temperature decreased, the clay strength increased. This research provides valuable information for correcting laboratory test results and improving parameter accuracy for ocean engineering.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Mujun Chen et al.
Summary: This study utilizes the XGBoost algorithm to establish a machine learning model for predicting the sound speed of seafloor sediments based on the data from typical samples collected in the East China Sea. The model incorporates five physical parameters and optimizes the hyperparameters to enhance prediction accuracy. The results demonstrate that the model achieves high accuracy in predicting seafloor sediment sound speed.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Jingqiang Wang et al.
Summary: The acoustic characteristics of three fine-grained sediments in the South China Sea were measured and analyzed. It was found that the dispersion of sound speed is linearly related to frequency, while attenuation follows nonlinear frequency dependence. The dispersion characteristics of the sediments were compared with published literature and found to be consistent. Coarse particles show significant dispersion, while fine particles exhibit weak dispersion. The Biot-Stoll model was found to accurately predict the frequency-dependent characteristics of sound attenuation in a high-frequency band.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Weiqi Fu et al.
Summary: The rheological properties of CO2 hydrate slurry were experimentally studied using a new flow loop. The slurry was found to be a powerlaw fluid with strong shear-thickening behavior. The increase in volumetric hydrate concentration not only increased the apparent viscosity, but also enhanced the non-Newtonian behavior.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Marine
Qingfeng Hua et al.
Summary: Based on data acquired during China's 10th Arctic Scientific Expedition Cruise in 2019, a sediment wave field was found on the western slope of the Chukchi Rise, Arctic Ocean, consisting of several parallel sediment waves with wavelengths ranging from 700 m to 3400 m and wave heights from 12 m to 70 m. The genesis of these sediment waves is attributed to the interaction between the bottom current and seafloor morphology.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
