多场耦合多孔复合介质力学行为研究

Due to the unique structure and superior mechanical properties of porous media, the researches on its mechanical behavior are of great significance in practical application and theoretical research. However, it is difficult to solve the problems of multi-physical field coupling of porous materials considering the complexity of its structure and the multi-field coupling effects.. Goal of the present project is to exploit analytical and numerical modelling approaches in connection with experimental work, establish a mechanical model for the interaction among the multi-physical field (fluid, thermal, electric and concentration fields) under complex condition with respect to geochemical, electric and thermal effects; and to analyze the interaction and influence of various environments on porous materials in dynamic equilibrium. Moreover, the mechanical model of porous media or its composites with defects will be constructed, the growth of both interface and matrix cracks will be illuminated. Furthermore, the mutual interference problems among cracks, dislocations and inclusions can be analyzed, and the performance deterioration and failure mechanism of porous materials will be revealed. The present research will promote the development of porous media in the fields of architectural environment engineering and food safety.

由于多孔介质独特的结构和优越的力学性能，对其力学行为的研究无疑在实践应用和理论研究方面具有重要的意义。然而，其结构的复杂性以及具有的多场耦合效应，使得对多孔介质多物理场耦合问题的求解变得十分复杂。. 本项目旨在利用理论和数值建模方法，通过实验分析，考虑多孔介质的化学、电、热等耦合效应，建立复杂工况下渗流场、温度场、电场和浓度场等多物理场相互耦合的力学模型，并分析在相互制约的动态平衡体系状态下，不同的环境对多孔介质的相互作用和影响。同时，构建多孔介质及其复合结构缺陷问题的力学模型，阐明界面和基体裂纹生长规律，分析裂纹、位错和夹杂等相互干涉的问题，揭示多孔介质的性能劣化和破坏失效机理。该研究将推动多孔介质在建筑、环境工程以及食品安全等领域的发展。

基于多孔介质流固耦合方程，利用Stroh公式，获得多孔介质在位错和流源作用下的Green函数解。同时，分析在载荷作用下含孔洞多孔介质的力学行为。利用传递矩阵法，从单层多孔介质过渡到多层多孔介质的研究中，获得复杂工况下多孔复合介质的Green函数解。该研究有助于理解多孔材料及其层状结构变形与损伤演化过程，从而揭示新的物理现象。