Theoretical analysis for thermal consolidation of marine sediments with depth variability subjected to time-dependent loading and heating

Hu，Ming Jun1,2; Feng，Wei Qiang1,3; Yang，Jun2

2023-04-01

10.1016/j.oceaneng.2023.113894

OCEAN ENGINEERING   Impact Factor & Quartile

0029-8018

Because the spatial distribution of energy is restricted, many energies geotechnics would build on marine sediments and the resulting thermal consolidation would pose an inevitable threat to the safety and stability of the project. In this study, a new governing equation for thermal consolidation of saturated marine sediments is proposed, by considering the depth variability of the marine sediment layer and the time-dependent external loading and temperature. The corresponding one-dimensional (1D) analytical solution for thermal consolidation of saturated marine sediments is derived. The average degree of consolidation (U) and the normalized excess pore water pressure (u/u) in the saturated marine sediment layer at different depths and time durations are calculated and compared with the typical loading case. The results show that the loading rate of the external force only affects the amplitude of the excess pore water pressure u and does not affect the proportion of u with depth; the depth variability of bulk modulus has a greater effect on the distribution of U relative to the depth variability of permeability; the depth variability of permeability has a greater effect on the distribution of u/u with depth relative to the depth variability of bulk modulus when U = 50%; the assumption of instant thermal loading will lead to an over-assessment of U and u/u. This study provides useful insights for energy geotechnical engineering design and practice.

Analytical solution Marine sediments Thermal consolidation Time-dependent loading

English

First

ENGINEERING

2-s2.0-85148353656

Scopus

1.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,China
2.Department of Civil Engineering,The University of Hong Kong,Hong Kong,China
3.Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou),China

Hu，Ming Jun,Feng，Wei Qiang,Yang，Jun. Theoretical analysis for thermal consolidation of marine sediments with depth variability subjected to time-dependent loading and heating[J]. OCEAN ENGINEERING,2023,273.

Hu，Ming Jun,Feng，Wei Qiang,&Yang，Jun.(2023).Theoretical analysis for thermal consolidation of marine sediments with depth variability subjected to time-dependent loading and heating.OCEAN ENGINEERING,273.

Hu，Ming Jun,et al."Theoretical analysis for thermal consolidation of marine sediments with depth variability subjected to time-dependent loading and heating".OCEAN ENGINEERING 273(2023).