水环境下泥岩崩解过程的CT观测与数值模拟研究

CT observation and numerical simulation of mudrock disintegrating process in water environment

为认识泥岩崩解过程,首先探讨采用X-光计算机断层扫描(CT)观测泥岩崩解过程,揭示了泥岩的崩解机制是最初的微小裂缝为水渗透进入泥岩提供了最初路径,渗入泥岩的水导致黏土矿物质膨胀,而碳酸盐离子溶液会破坏泥岩的整体性,降低泥岩的局部承载能力,导致宏观裂纹发展和泥岩崩解。为全面描述泥岩的崩解机制,建立了一个体现渗透系数与材料塑-拉应变之间关系的本构模型,通过数值方法再现了泥岩崩解过程,为进一步认识和防治泥岩崩解灾害提供关键依据。

For knowing the disintegration process of the mudrock, we discussed that the mudlock disintegration process had been detected by the X-ray Computerized Tomography （CT） . The observation indicated that the disintegrating mechanism of this material under water environment is that the micro fractures firstly provide the initial path for the water to seeping into the unloaded mudrock, the seeped water would induce the swe｜｜ing of clay minerals and ion solution of carbonate, damage the integrity of the mudrock, reduce its bearing capacity, and resuhantly lead to extension of cracks. A numerical model, which builds the relationship between permeability coefficient and material plastic-tension strain, was developed to describe the mudrock＇s disintegrating process. This study presents experimental and numerical hints for disaster prevention of water- sensitive mud rock.