摘要
为研究巷道围岩在高应变率作用下的破坏特征,利用大直径分离式霍普金森杆(SHPB)加载系统,对岩样进行冲击压缩试验,探究岩石试样在大直径SHPB冲击作用下的动态响应特征和规律,研究结果表明:波形整形器采用橡胶垫片可以有效改善波形形状,减少波形弥散;岩石试样的动力增强系数与应变率提高系数呈正相关关系,具有显著的应变率敏感性特点;随着应变率的增加,破碎块度平均尺寸和能量利用率均降低;大直径SHPB冲击作用下,岩石试样的能量利用率较低,最高仅为10.10%。
In order to study the failure characteristics of surrounding rock of deep roadway under high strain-rate loading,impact compression tests of rock samples was carried out using a large diameter split Hopkinson pressure bar(SHPB)loading system.The dynamic response characteristics and laws of rock specimens under the impact of large diameter SHPB were studied.The experimental results indicate that,as a wave shaper,the rubber sheet can effectively improve waveform shape and reduce wave dispersion.The strain rate sensitivity of the rock specimens is very obvious,because its dynamic enhancement coefficient has a positive correlation with the strain rate increase coefficient.Both the average size of fragmentation and energy utilization ratio decrease with the increase of the fragmentation rate.Under the impact of the large-diameter SHPB,the energy utilization ratio of rock specimens is relatively low,and the highest is only 10.10%.
作者
蒋志坚
孙赑
平扬
朱珍德
JIANG Zhijian;SUN Bi;PING Yang;ZHU Zhende(Shenzhen Water Planning and Design Institute Co.,Ltd.,Shenzhen 518001,China;Harbin Institute of Technology(Shenzhen),Shenzhen 518055,China;Key Laboratory of Ministry of Education of Geomechanics and Embankment Engineering,Hohai University,Nanjing 210098,China)
出处
《采矿与岩层控制工程学报》
北大核心
2021年第4期30-36,共7页
Journal of Mining and Strata Control Engineering
基金
国家重点基础研究发展计划(973)资助项目(2015CB057903)
国家自然科学基金资助项目(51579081)。
关键词
大直径SHPB
动态响应
应变率效应
破坏形态
能量利用率
large diameter SHPB
dynamic response
strain rate effect
failure mode
energy utilization ratio
