Research on coupled thermo-hydro-mechanical dynamic response characteristics of saturated 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. 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.

Deep-Sea Mining—A Bibliometric Analysis of Research Focus, Publishing Structures, International and Inter-Institutional Cooperation

“…The 'Mining process' subcategory also includes studies on the mechanical properties of the seabed and the breakage characteristics of the ore [73][74][75][76][77]. Zhu et al [76] investigated the stability of heterogeneous sediments when exposed to the load and vibration of the mining vehicle, whereas Dai et al [73] determined the uniaxial and triaxial strengths of seafloor massive sulphide samples to obtain their key mechanical properties in order to simulate the cutting process. Hu [77] studied the use of pulse plasma discharge and experimentally determined the breakdown voltage of artificial crust and bedrock samples.…”

Coupling dynamic response of saturated soil with anisotropic thermal conductivity under fractional order thermoelastic theory

“…Shakeriaski et al [ 31 ] studied the transient response of a porous medium affected by external traction using the G-L theory of thermoelasticity. Zhu et al [ 32 ] studied the thermo-hydro-mechanical coupling of saturated porous deep-sea sediments under the action of mine cart vibration, based on the G-L generalized theory of thermoelasticity and Darcy’s law.…”

Vibrations of composite structures: Finite element and analytical investigation

“…7,[17][18][19][20] On the other hand, in many cases, to reduce the weight of the shells, to provide access to the internal parts or connect other parts to the structure, opening these structures is inevitable. [21][22][23][24] The presence of these openings on the one hand reduces the rigidity of the structure and on the other hand reduces its weight. [25][26][27][28][29] This makes its effects on the vibrational behavior of the shells unpredictable and should be taken into account in the design of such structures.…”