摘要
利用SHPB试验设备,研究花岗岩在不同冲击气体压力下的压缩力学性能,讨论岩石类材料的应力-应变特性和破坏过程。结果表明,花岗岩的平均应变率与冲击气体压力有明显相关性,在不同冲击压力下,应变率时间历程曲线明显不同;岩石的应力-应变曲线可分成初始压密、稳定变形、非线性弹性与破坏4个阶段,且冲击气压存在一个使岩石破碎效果明显的合理值;其破坏形式大多以沿轴向的劈裂破坏为主,但在较高的冲击气压作用下,岩石则呈压碎破坏形式。
The dynamic compression mechanical properties of granites under different gas pressures were investigated using Split Hopkinson Pressure Bar（SHPB）,and the stress-strain characteristics and failure process of the rock material were discussed.The testing results showed that there had an obvious fitting relationship between the average strain rate and the impact pressure,and the time-history curves of strain showed significantly difference under various impact pressures;the rock stress-strain curve could be divided into four stages,and the impact pressure had a reasonable value that demonstrated impact on the broken rock;the damage forms of fracturing presented an axial cleaving mode as the major and crushing mode under the high impact pressure.
出处
《工程爆破》
北大核心
2014年第1期1-4,53,共5页
Engineering Blasting
基金
辽宁省高等学校优秀人才支持计划资助项目(LR2011006)
关键词
岩石破碎
SHPB试验
应变率
Fragmentation of rocks
SHPB experiment
Strain rate
