CT实时观察下泥岩遇水软化过程的机理  

Mechanism of Water-Weakening Process of Mudrock Observed Using Real-Time CT

作　　者：杨成祥[1] 宋磊博 王刚[1] 龚彦华[1] 

机构地区：[1]东北大学深部金属矿山安全教育部重点实验室,辽宁沈阳110819

出　　处：《东北大学学报（自然科学版）》2015年第10期1461-1465,共5页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金重点资助项目(11232014);中央高校基本科研业务费专项资金资助项目(N120701001)

摘　　要：利用CT断面成像技术(X-ray CT)实时观察水-岩作用过程中泥岩细观结构的动态软化过程.通过对不同浸水时间泥岩试样的实时扫描观察,获得水作用下泥岩内部裂隙的时空演化特点,如初始裂隙效应、网状扩展行为、空间非均匀分布和典型活跃期.据此得出水-岩作用过程中泥岩遇水软化微观结构演化的三个环节:首先历史成岩过程形成的细观裂隙为后来的水分子侵入泥岩提供了初始通道;接着侵入的水分子通过物理和化学作用导致泥岩中黏土矿物的体积膨胀和可溶碳酸盐溶解;最后是不利的黏土矿物体积膨胀和可溶碳酸盐溶解衍生的力学效应导致裂纹的扩展和相互连通.The computerized tomographic scanner （CTS）was used to investigate the dynamic weakening process of the mudrock meso-structure when interacting with water.A series of real-time scanning tests were performed on the mudrock specimen soaked for different time.The space-time evolution characteristics of water-induced cracks inside mudrock,including the original fracturing effect,netty extension behavior,spatial nonuniformity distribution and active period of reaction,were exposed dynamically by CTS.The water-weakening process of the mudrock meso-structure can be divided into the following steps：firstly,inherent micro fractures provide the initial path for water to invade into unloaded mudrock;then the incursive water induces the volume increase of clay minerals and ion solution of carbonate through physical and chemical reactions;finally,the adverse mechanical impact derived from the volume expansion and solution of carbonate leads to the propagation and connection of cracks.

关 键 词：工程地质 泥岩 遇水软化 CT 观测 机理 

分 类 号：TU458[建筑科学—岩土工程]