循环温度荷载作用下饱和多孔介质热-水-力耦合响应

对半无限体表面作用简谐循环温度荷载下,饱和多孔介质热-水-力耦合响应的一维情形进行研究,给出内部温度、孔压和位移等的解析表达式。分析了半无限体温度响应由瞬态到准稳态的演化过程以及准稳态条件下温度、孔压和位移等的波动特征。研究表明:随着温度荷载作用时间的增长,热力学响应以波的形式向深处传导和扩散并趋于准稳态过程;随着介质深度的增加,热力学响应的波动幅值不断减小,而其相位相应滞后;随着介质透水性质的增强,孔压沿深度的分布趋于均匀化;当介质深度超过一个波长后,其热力学响应值几乎为零。

THERMO-HYDRO-MECHANICAL RESPONSES OF SATURATED POROUS MEDIA UNDER CYCLIC THERMAL LOADING

An analytical method is developed for the thermo-hydro-mechanical responses of a semi-infinite saturated porous medium subjected to one-dimensional harmonic thermal loading. The expressions for temperature, pore pressure and displacement fields are deduced. The processes of temperature responses from instantaneous state to quasi-steady state are discussed. The fluctuation characteristics of temperature, pore pressure and displacement in quasi-steady state are analyzed. The studies show that the thermal mechanical response is gradually conducted from the surface to deep layer with elapsed time, and fmally reaches a quasi-steady state. The amplitudes of the thermal responses decrease with increasing depth; however, the corresponding phases are delayed. The pore pressure distributions with depth become more uniform with increasing permeability. When the depth is greater than a wavelength, the values of thermal responses approach zero.