Abstract Thermal problems may be encountered in offshore engineering applications, such as pipeline engineering activities and submarine nuclear waste storage. However, few studies have focused on the behaviours of marine sediment involved temperatures, especially under long-term low cyclic loads. In this study, a series of undrained temperature-controlled triaxial tests were carried out to study the thermal effects on the dynamic properties of marine sediment from the South China Sea (SCS) under long-term low cyclic loading. The experimental tests were performed at different temperatures and cyclic stress ratios (CSRs). The dynamic deformation, pore pressure and degradation of the strength of the samples were measured and analyzed. Two modified models for predicting the pore pressure and degradation of marine sediment are presented based on the experimental data. The results indicate that the temperature-induced pore pressure increases with increasing temperature as a power function without draining and loading. The axial strain, loading-induced pore pressure and degradation index decrease with increasing temperature. The CSRs have a substantial influence on the axial strain and loading -induced pore pressure.

中文翻译：

---

长期低循环应力下海洋沉积物动力特性的热效应

摘要 海洋工程应用中可能会遇到热问题，例如管道工程活动和海底核废料储存。然而，很少有研究关注与温度有关的海洋沉积物的行为，特别是在长期低循环载荷下。在这项研究中，进行了一系列不排水温控三轴试验，以研究长期低循环载荷下南海海洋沉积物（SCS）动力特性的热效应。实验测试在不同温度和循环应力比 (CSR) 下进行。对样品的动态变形、孔隙压力和强度退化进行了测量和分析。基于实验数据，提出了两种用于预测海洋沉积物孔隙压力和退化的修正模型。结果表明，在没有排水和加载的情况下，温度引起的孔隙压力随着温度的升高而增加，作为幂函数。轴向应变、加载引起的孔隙压力和退化指数随着温度的升高而降低。CSR 对轴向应变和加载引起的孔隙压力有重大影响。