岩石动态断裂耗能机制的形貌学分析  

Fractography Analysis on Dynamic Fracture in Rock

作　　者：刘彩平[1] 段庆全[2] 彭瑞东[3] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中国石油大学(北京)机电学院,北京昌平102249 [3]中国矿业大学煤炭资源与安全开采国家重点实验室,北京100083

出　　处：《金属世界》2009年第C00期22-25,共4页Metal World

基　　金：教育部博士点基金新教师项目(编号:20070008014)

摘　　要：为研究岩石动态断裂的耗能机制,本文进行了灰岩试样Ⅰ型断裂的快速加载和准静态加载对比试验。对断口进行了激光表面仪扫描和扫描电镜(SEM)拍摄,分别获得了反映粗糙程度和断裂花样的形貌。用分形几何法定量分析了动静态断口粗糙程度,结合SEM图像形貌,指出了动态冲击与准静态断裂断口粗糙程度和断裂模式的差异,讨论了岩石动态断裂的耗能机制。The rapid loading and quasi-static 3-point bending tests were carried out to make clear the energy dissipation and fracture mechanisms in dynamic fracture process in rock, respectively on drop hammer tester and electro-hydraulic servo testing machine. The texture images of two kinds of fracture by different loading modes were captured by SEM （Scanning Electronic Microscope）. Meanwhile, the rough surface with three dimensional coordinates was obtained by laser profilometer, for which the fractal dimension D was estimated by a kind of improved cubic covering method. With the help of SEM photograph, one can see the deference between the fiacture by two loading modes. Then, it can be concluded that dynamic fracture energy is more than quasi-static fracture energy.

关 键 词：岩石 动态断裂 形貌学 SEM 耗能 分形 

分 类 号：P584[天文地球—岩石学]