红层软岩软化的微–细–宏观界面关联过程与跨尺度级联效应

Micro-meso-macro interface correlation processes and cross-scale cascade effects in red-bed soft rocks softening

红层软岩灾变与水–岩界面作用过程密切相关,研究微–细–宏观关联过程与级联效应对于揭示其灾变机制具有重要意义。目前对软岩软化的研究主要集中于细宏观水–岩界面的表观特征,微–细–宏观界面关联特性及其跨尺度级联效应仍需进一步研究。针对这一问题,通过对软岩软化界面反应过程的微观化学反应、细观物理特性与宏观力学作用进行分析,建立水–岩界面的关联过程。依据能量流理论与级联概念,对软岩破坏的跨尺度级联效应进行分析。结果表明,水溶液阳离子浓度、软岩颗粒骨架外孔隙的占有比例和软岩崩解物质量3个因素,可以很好地阐述水–岩界面的关联过程。软岩软化过程中微–细–宏观级联因子均呈现逐级递增的趋势。解决了红层软岩软化水–岩界面关联过程的不完善与级联效应的跨尺度问题,为揭示软岩软化的深层次机制提供参考。

The water-rock interaction at micro-meso-macro interface is closely related to the catastrophic changes in red-bed soft rocks.The study of the correlation process and cross-cascade effect at micro-meso-macro interface of water-rock interaction is of great significance to reveal the catastrophic mechanisms of soft rocks under water reaction.At present,the research on soft rock softening mainly focuses on the external characteristics of the meso-macro interface and its cascade effect.The correlation properties and cross-scale cascade effect of micro-meso-macro interface in red-bed soft rocks are in the exploration stage and still need further improvement.To address this problem,in this study,the correlation process of water-face interaction within red-beds soft rock is established by the analysis of micro-scale chemical reaction,meso-scale physical properties and macro-scale mechanical action of interface reaction process during soft rock softening.Based on the energy flow theory and the concept of cascade,the cross-scale cascade effect during the failure process of soft rocks was analyzed.The results show that the correlation process of water-rock interface can be well explained by three factors as follow:the cation concentration of aqueous solution,proportion of pores outside the framework of soft rock particles as well as quality of soft rock disintegration.During the softening process of soft rock,the micro and macro cascade factors show a gradual increasing trend.The imperfect correlation process of water-rock interface and cross-scale problem of cascade effect during the process of soft rock softening was solved and the references for revealing the deep mechanism of soft rock softening was also provided.