饱和度对多孔介质中热–水–力耦合响应的影响

以湿-热弹性理论为基础,给出了非饱和多孔介质中热能传输、水分迁移和变形的耦合控制方程,并与已有试验结果进行了对比。模型计算结果与试验结果吻合较好。针对多孔介质中初始饱和度随深度呈不同分布的三维非对称热源问题进行了热–水–力耦合响应分析。分析表明:当初始饱和度沿竖向的梯度变化较小时,重力作用下孔隙水首先由多孔介质上部向下部流动,继而在温度荷载作用下产生回旋流动。当竖向梯度变化较大时,基质吸力作用下孔隙水先由饱和度较高的底部流向饱和度较低的顶部,然后产生回旋流动,且回旋中心位置随竖向梯度的减小逐渐向多孔介质中心位置靠近。

Effect of saturation on thermo-hydro-mechanical coupled responses in porous media

An analytical method is developed for the governing equations for coupling of heat transfer, moisture transfer and deformation in unsaturated porous media based on the theory of wet and thermal elasticity. Compared with the existing experimental results, the calculated results are in good agreement with the experimental ones. The numerical analysis of thermo-hydro-mechanical in porous media is performed, which is a three-dimensional model for asymmetric heat source with different distributions of initial saturation degrees. The results show that when the vertical gradient of the initial saturation is smaller, the pore water is first to flow from the upper part to the lower part of the porous media under the action of gravity. And then the swirling flow is generated under the action of temperature load. On the other hand, when it is larger, the pore water under the action of matrix suction flows from the bottom of the porous media with high saturation to the top of the porous media with low saturation under the effect of matrix suction, and then a swirling flow is produced. With the decrease of the vertical gradient, the center of the swirling gradually moves closer to the center position of the porous media.