Deep-Sea Sediment Creep Mechanism and Prediction: Modified Singh–Mitchell Model Under Temperature–Stress–Time Coupling
2026
Yan Feng | Qiunan Chen | Lihai Wu | Guangping Liu | Jinhu Tang | Zengliang Wang | Xiaodi Xu | Bingchu Chen | Shunkai Liu
With the advancement in deep-sea resource development, the creep behavior of deep-sea remolded sediments under coupled temperature, confining pressure (&sigma:3), and stress effects has become a critical issue threatening engineering stability. The traditional Singh&ndash:Mitchell model, limited by its neglect of temperature effects and prediction of infinite strain, struggles to meet deep-sea environmental requirements. Based on low-temperature, high-pressure triaxial tests (with temperatures ranging from 4 to 40 °:C and confining pressures ranging from 100 to 300 kPa), this study proposes a modified model incorporating temperature&ndash:stress&ndash:time coupling. The model introduces a hyperbolic creep strain rate decay function to achieve strain convergence, establishes a saturated strain&ndash:stress exponential relationship, and quantifies the effect of temperature on characteristic time via coupling through the Arrhenius equation. The modified model demonstrates R2 values >: 0.96 for full-condition creep curves. The results show several key findings: a 10 °:C increase in temperature leads to a 30&ndash:50% growth in the steady-state creep rate: a 100 kPa increase in confining pressure enhances long-term strength by 20&ndash:30%. 20 °:C serves as a critical temperature point. At this point, strain amplification reaches 2.1 times that of low-temperature ranges. These experimental findings provide crucial theoretical foundations and technical support for incorporating soil creep effects in deep-sea engineering design.
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