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| Effects of thermoelastic coupling on the propagation of body waves in saturated porous media |
| LIU Hongbo1，ZHOU Fengxi1，2，ZHANG Ruiling1，YUE Guodong 1 |
| (1. School of Civil Engineering，Lanzhou University of Technology，Lanzhou，Gansu 730050，China；
2. Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education，Lanzhou University of Technology，Lanzhou，Gansu 730050，China) |
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Abstract Based on the research results of saturated porous medium and considering the influence of thermal effect，the propagation characteristics of body waves in saturated porothermoelastic medium are studied in this paper. The thermoelastic wave equations are established by means of thermal coupling momentum balance equation and seepage continuity equation in porothermoelastic medium and the dual-phase-lag model. By introducing potential functions，the dispersivity characteristic equations of body waves in saturated porothermoelastic medium are derived theoretically. The velocity variation of four body waves(P1 wave，P2 wave，S wave and thermal wave) with thermal physical parameters such as frequency，porosity，permeability coefficient，thermal expansion coefficient，thermal conductivity and phase-lag of heat flux and temperature gradient is analyzed with numerical examples. The results show that the increase of thermal expansion coefficient will cause the increase of wave velocity of P1 wave and P2 wave and the decrease of wave velocity of thermal wave. The increase of thermal conductivity and phase-lag of temperature gradient will only cause the increase of wave velocity of thermal wave，while the increase of phase-lag of heat flux only causes the decrease of wave velocity of thermal wave. The variations of frequency，porosity and permeability coefficient have a great influence on the wave velocity of various thermoelastic waves，which cannot be ignored.
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2020, Vol. 39 
