动态压缩试验中煤系砂岩的应变率效应问题  

Strain Rate Effect Problem of Coal-Derived Sandstone in Dynamic Compression Test

作　　者：牛龙华 Niu Longhua(School of Civil Architecture,Anhui University of Science and Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《科学技术创新》2022年第22期111-114,共4页Scientific and Technological Innovation

摘　　要：为了定量分析特定环境中煤系砂岩在冲击荷载作用下的应变率效应,采用分离式霍普金森压杆试验装置对砂岩开展动态压缩试验。试验表明:其峰值应力和应变、耗能密度都具有明显的应变率效应;另外其破碎程度随着应变率的增加而逐渐变大,由劈裂破坏过渡到粉碎性破坏。In order to quantitatively analyze the strain rate effect of coal-bearing sandstone under impact loading in a specific environment,dynamic compression tests were conducted on sandstone using a detached Hopkinson compression bar test apparatus.The tests showed that:its peak stress and strain,energy dissipation density have obvious strain rate effects;in addition,its fragmentation degree gradually becomes larger with the increase of strain rate,and transitions from cleavage damage to crushing damage.

关 键 词：能量耗散 应变率 破碎程度 

分 类 号：TU45[建筑科学—岩土工程]