弱胶结类岩石细观结构参数与其宏观力学行为的关联性研究进展

Progress on the Association between Mesostructural Parameters and Macromechanical Behaviors of Weakly Cemented Rocks

弱胶结类岩石主要为颗粒和胶结物质由压实或胶结作用而成,具有多尺度性、多相性以及复杂性,其细观结构的颗粒和胶结物质的物理特性、胶结特性以及颗粒和胶结物质构成的结构系统对其宏观力学性能有重要的影响。梳理了弱胶结类岩石宏细观研究的整体分析思路,总结了现有研究弱胶结类岩石细观结构的实验测试技术及其细观结构参数的定量选取和表征方法。列举了采用数值计算来研究细观结构参数单一变量对宏观力学性质的研究成果。为表征弱胶结砂岩细观结构的演化特征,提出了弱胶结类岩石模型建立时必须遵循的基本原则。在研究总结的基础上,揭示了弱胶结类岩石受力条件下细观结构演化过程中颗粒接触特征的演化过程。寻求以测试技术手段为基础的细观结构演化过程中临界特征提取与判别方法,以期为研究弱胶结类岩石细观构造的定量参数与宏观力学行为的关联性奠定基础。

Weakly cemented rocks(WCRs) primarily comprise grains and cementing materials which were formed due to effects of compaction and cementation with the characteristics of multiscale,heterogeneity and complexity. Their macromechanical behaviors of the cemented rocks are greatly influenced by physical properties,cementation characteristics and the structural system consisting of the microscopic grains and cementing materials. In this research,an analysis idea of the macro-,and meso-,structures of WCRs is generally demonstrated. Furthermore,existing experimental techniques for researching the mesostructure of WCRs and methods of quantitatively selecting mesostructural parameters are summarized. Additionally,previous studies on the influence of single variable for mesostructural parameters on macromechanical behaviors of WCRs are also reviewed. It is proposed that the basic principles have to follow when WCRs model was established for characterizing the macrostructural evolution of WCRs;Based on this aforementioned,the evolution of grain-to-grain contact characteristics was revealed in the evolution of mesostructure for WCRs under stress state;It aims to proposing a method for extracting and determining critical characteristics of evolving mesostructure via measurement techniques,to lay a foundation for the research on the association between quantitatively measured mesostructural parameters and macromechanical behaviors of WCRs.