脆性岩石中裂纹速度效应的试验研究

Experimental Study on Velocity Effects in Dynamic Fracture of Brittle Rock

为考察岩石材料中与裂纹速度变化相关的系列现象,对两类岩石I型断裂梁式试样进行了落重加载试验,同时利用高速摄影记录试样表面的变化情况。之后,借助激光表面仪和扫描电镜等实验技术获得了断口和试样表面的细观结构信息。利用现象学方法分析了高速断裂中裂纹速度效应与岩石断裂模式和断裂耗能的关系。

To investigate the phenomena of the fracture velocity in rocks materials,the weight-drop tests of two rocks samples with I-type initial crack are carried out.Meanwhile,high-speed photography is used to record crack tip position in surface.And the Scanning Electronic Microscope（SEM） and Laser Profilometer are adopted to obtain the specific structural information from cross-fracture and sample surface.Then,the relationship of the fracture velocity in rapid crack with the rock crack mode and energy consumption is analyzed by the phenomenology method.