应用CT技术研究砂岩脆性破坏裂纹扩展规律  

Crack Propagation Law for Brittle Failure of Sandstone Studied by Using CT Technology

作　　者：邓远刚[1] 孟嫣然 杨振琦[1] 胡嘉琪 王述红[1] Deng Yuangang;Meng Yanran;Yang Zhenqi;H u Jiaqi;Wang Shuhong(School o f Resources and Civil Engineering, Northeastern University^ Shenyang 110819, Liaoning, China)

机构地区：[1]东北大学资源与土木工程学院,辽宁沈阳110819

出　　处：《工程与试验》2017年第3期14-18,103,共6页Engineering and Test

基　　金：国家自然科学基金资助项目(51474050;U1602232);地质灾害防治与地质环境保护国家重点实验室项目(SKLGP2014K011);国家级大学生创新创业训练计划资助项目(201610145021)

摘　　要：本文以致密砂岩为研究对象,先对其进行单轴压缩,后应用CT技术对发生脆性破坏后的试件进行扫描,通过分析扫描图像得到其裂纹的扩展规律。研究表明,每一条独立裂纹都以一恒定曲率系数K随层位向试样内部扩散,直至裂纹曲率趋近于无穷。当裂纹扩展达到稳态,若无其他因素影响,则不会再随层位继续扩展。通过分析,定义出岩石脆性破坏状态时的裂纹聚集域和裂纹非聚集域。同时,根据能量守恒定律,得出了衍生裂纹及新次生裂纹产生的判据。In this paper,the tight sandstone is taken as an example,and the sandstone is selected for uniaxial compression test.The CT technology is employed to capture a serial o f sectional images of the brittle failure o f the sandstone,so the crack propagation law is obtained.The research shows that each individual crack w ill propagate within the specimen with layer orientation based on a constant curvature coefficient K,until the crack curvature tends to in fin ity.A fter the crack reaches steady state,if no other influencing factors,the crack w ill no longer propagate with the layer orientation.The domain o f crack aggregation and the non aggregation o f cracks is defined,and the new criterion o f derivative crack and secondary crack is produced.

关 键 词：CT扫描 脆性破坏 曲率系数 致密砂岩 裂纹扩展 单轴压缩 

分 类 号：TU45[建筑科学—岩土工程]