岩石渗流应力耦合特性研究

RESEARCH ON COUPLING CHARACTERISTICS OF FLUID FLOW AND STRESS WITHIN ROCK

综合起来,已有岩石渗流应力耦合特性的研究方法有3种:(1)直接通过渗流应力耦合试验得到渗透系数与应力、应变关系的经验公式;(2)根据已有的耦合试验研究的成果设定耦合特性关系式的函数形式,采用力学方法推导函数式中变量的表达式,确定耦合特性关系式;(3)以各类模拟渗透现象的物理模型为基础,利用力学工具建立耦合关系式。根据这3种研究方法对研究成果进行划分,作了较系统的归纳和介绍,对各类成果的合理性及应用情况进行了评述。最后展望了岩石渗流应力耦合特性方面的研究前景和发展方向。

Based on the review of the current research achievements in the field of coupled fluid flow and stress in rock, the research methods can be boiled down into 3 types. The first is drawing empirical formulas from coupled fluid flow and stress experiments directly. The second is establishing function according to existent empirical formulas, deducing the variable expression in the established functions by mechanical method and then determining the formulas. The third is establishing coupled relational expression by mechanical tool based on various physical models that simulate seepage phenomena. Based on this classification, the current research works are introduced with their rationality and applicability analyzed. Moreover, future development and the possible improvement are briefly discussed. Firstly, in order to fulfill the requirement of engineering application, the research of coupled fluid flow and stress in combination of porous rock and fractured rock and the corresponding numerical model should be developed. Secondly, there is great research space in the field of anisotropic coupled fluid flow and stress in rock and this work is necessary. New coupled triaxial fluid flow and stress experiment equipment should be developed to study the seepage property under true triaxial stress. Thirdly, because of non-reversible characteristics of rock deformation influence rock permeability, it is necessary to enhance the testing study on rock permeability under stress that changes in a non-monotone way. Fourthly, the research of coupled between fluid flow and stress and research of rock failure should be combined. It is very helpful to explore the inherent seepage mechanism that promotes the combination of macro-research and micro-research. Finally, it is important to take physical, mechanical and chemical effects into account in the coupled research because the three effects appear at the same time when water flows in rock.