Thermo-hydro-mechanical nonlocal response on porous deep-sea sediments under vibration of mining vehicle

Abstract

The excessive deformation of deep-sea sediments caused by the vibration of the mining machine will adversely affect the efficiency and safety of mining. This paper reports the study of coupled thermo-hydro-mechanical problem for saturated porous deep-sea sediments, subjected to the vibration of the mining vehicle. Based on nonlocal Moore–Gibson–Thompson thermoelastic theory and Darcy’s law, the model for thermo-hydro-mechanical dynamic response for saturated porous deep-sea sediments under the vibration of mining vehicle is established. Analytical solutions for vertical displacement, excess pore water pressure, vertical stress, temperature and the change in the volume fraction field have been obtained on implementing the normal mode analysis, and the numerical results have been depicted graphically. The result provides the direction on how the vibration frequency and the loading amplitude can affect the physical quantities of the foundation of the seabed. The influence of nonlocality and memory effect on the seabed is also reported.