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Keywords = gassy marine clays

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15 pages, 2368 KiB  
Article
A Study on the Creep Characteristics of Gassy Clay Mixed with Silt
by Aiwu Yang, Tianli Liu, Hao Zhang and Boqu Zhang
Appl. Sci. 2025, 15(9), 5106; https://doi.org/10.3390/app15095106 - 4 May 2025
Viewed by 336
Abstract
As the economy evolves, there has been an increasing interest in exploring oceanic resources. However, the complex marine environment poses several geological challenges for offshore engineering endeavors. The presence of gassy soil significantly influences the deformation properties and integrity of the soil, significantly [...] Read more.
As the economy evolves, there has been an increasing interest in exploring oceanic resources. However, the complex marine environment poses several geological challenges for offshore engineering endeavors. The presence of gassy soil significantly influences the deformation properties and integrity of the soil, significantly impacting offshore engineering construction. Triaxial shear tests and creep tests were conducted on gassy clay with silt content, prepared using the laboratory “zeolite method”, to analyze its shear deformation characteristics and long-term resilience. We proposed a prediction model for calculating the long-term resilience of silt-containing clay, accounting for confining pressure and gas content, and verified its efficacy through experimentation. Our findings reveal the following: The stress–strain relationship curve of silt-containing gassy clay is a typical strain hardening curve. The greater the confining pressure or the smaller the gas content, the greater the stress under the same strain and the greater the yield stress; when the gas content is the same, the greater the confining pressure, the greater the long-term strength of the soil; and when the confining pressure is the same, the smaller the gas content, the greater the long-term strength of the soil. The research results can provide theoretical reference for actual complex engineering. Full article
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19 pages, 5425 KiB  
Article
Rheological Behavior of Gassy Marine Clay: Coupling Effects of Bubbles and Salinity
by Zhuanzhuan Zhang, Xionghuan Tan, Lizhong Wang, Gang Cao, Yuan Lin and Yi Hong
J. Mar. Sci. Eng. 2025, 13(1), 139; https://doi.org/10.3390/jmse13010139 - 15 Jan 2025
Viewed by 820
Abstract
Understanding the rheological behavior of marine clay is crucial to analyzing submarine landslides and their impact on marine resource exploitation. Dispersed bubbles in marine clay (gassy clay) and electrolytes in seawater (e.g., NaCl concentration of 0.47 M) significantly impacts rheological properties. Under low [...] Read more.
Understanding the rheological behavior of marine clay is crucial to analyzing submarine landslides and their impact on marine resource exploitation. Dispersed bubbles in marine clay (gassy clay) and electrolytes in seawater (e.g., NaCl concentration of 0.47 M) significantly impacts rheological properties. Under low ionic strength and low pore water pressure conditions, dispersed bubbles have a strengthening effect on the yield stress and the viscosity of clays. This effect turns into a weakening effect when the pore water pressure reaches 300 kPa or the ionic strength exceeds 0.18 M. It was proposed that the effect of bubbles, whether strengthening or weakening, was determined by the size of bubbles with respect to the characteristic size of the particle structure formed by clay particles. A theoretical model was developed, which reasonably captures rheological behaviors of gassy clays. Full article
(This article belongs to the Section Geological Oceanography)
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