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. Combined with the deep-sea environment, the coupled thermo-hydro-mechanical problem for saturated porous deep-sea sediments subject to the vibration of the mining vehicle is investigated. Based on the Green-Lindsay (G-L) generalized thermoelastic theory and Darcy’s law, the model of thermo-hydro-mechanical dynamic responses for saturated porous deep-sea sediments under the vibration of the mining vehicle is established. We obtain the analytical solutions of non-dimensional vertical displacement, excess pore water pressure, vertical stress, temperature, and change in the volume fraction field with the normal mode analysis method, and depict them graphically. The normal mode analysis method uses the canonical coordinate transformation to solve the equation, which can quickly decouple the equation by ignoring the modal coupling effect on the basis of the canonical mode. The results indicate that the vibration frequency has obvious influence on the vertical displacement, excess pore water pressure, vertical stress, and change in volume fraction field. The loading amplitude has a great effect on the physical quantities in the foundation, and the changes of the physical quantities increase with the increase in loading amplitude.
Highlights
With the rapid development of the world economy, people have higher and higher requirements for the quality of material life, and the mineral resources on the land can no longer meet the growing needs of human beings[1,2,3,4]
The analytic solution to the problem is obtained by using the normal mode analysis method, and the influence of the load frequency and load amplitude of the mining machine on the vertical displacement, vertical stress, excess pore water pressure, temperature, and change in volume fraction field is analyzed
This paper studies the thermal-hydro-mechanical coupling problem when the surface of the saturated porous seabed sediment is subject to the vibration of the mining machine
Summary
With the rapid development of the world economy, people have higher and higher requirements for the quality of material life, and the mineral resources on the land can no longer meet the growing needs of human beings[1,2,3,4]. Guo et al.[28] studied the influence of the L-S generalized thermoelasticity theory and G-L generalized thermoelasticity theory on thermal-hydro-mechanical coupling problems. Lu et al.[31] studied the effects of temperature on the stress, displacement, and pore water pressure of saturated porous foundations on the basis of the generalized thermoelastic theory. In this study, based on the G-L generalized thermoelastic theory and Darcy’s law, the thermal-hydro-mechanical coupled dynamic response of saturated porous deep-sea sediments under the vibration of the mining machine is studied. The analytic solution to the problem is obtained by using the normal mode analysis method, and the influence of the load frequency and load amplitude of the mining machine on the vertical displacement, vertical stress, excess pore water pressure, temperature, and change in volume fraction field is analyzed. The solution provided in this paper is applicable in deep-sea mining and has guiding significance for optimizing the mining system
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