摘要
为研究循环动荷载作用下岩石的动态变化,利用SHPB装置对长径比为2.0的试件进行冲击作用,分析试件在0.04,0.06,0.08,0.10 MPa气压冲击用下应力-应变曲线、峰值应力、峰值应变变化情况,结果表明:随着冲击气压的增加,试件反应出的峰值应力增加,试件受首次冲击的峰值应变减小。选用0.06 MPa气压对长径比为2.2,2.4,2.6的试件进行循环冲击作用,结果表明:长径比2.0的试件平均峰值应力为70.56 MPa;长径比2.2的试件为71.15 MPa;长径比2.4的试件为83.54 MPa;长径比2.6的试件为91.09MPa,且随着长径比增加,试件所能承受的动荷载次数减少。
In order to study the dynamic change of rock under cyclic dynamic loading, SHPB device was used to conduct the im-pact on the specimens with the length to diameter ratio of 2.0. Then, the stress-strain curve, peak stress and peak strain chan-ges of the specimens at impact pressures of 0.04, 0.06, 0.08, 0.10 MPa were analyzed. The results showed that with the in-crease of the impact pressure, the peak stress of specimen was increased and the peak strain of the first shock was reduced. Cy-clic impact under the pressure of 0.06 MPa was carried out on specimens with length to diameter ratio of 2.2, 2.4 and 2.6. The results showed that the average peak stress was 70.56 MPa during specimens with the length to diameter ratio of 2.0, the aver-age peak stress was 71.15 MPa during specimens with the length to diameter ratio of 2.2, the average peak stress was 83.54 MPa during specimens with the length to diameter ratio of 2.4, and the average peak stress was 91.09 MPa during specimens with the length to diameter ratio of 2.6. And as the diameter ratio increased, the dynamic loading of specimens would decrease.
作者
潘博
郭连军
宁玉滢
徐振洋
PAN Bo;GUO Lianjun;NING Yuying;XU Zhenyang(School of Mining Engineering,University of Science and Technology Liaoning,Anshan,Liaoning 114051,China)
出处
《矿业研究与开发》
CAS
北大核心
2018年第8期39-44,共6页
Mining Research and Development
基金
"十三五"国家重点研发计划项目(2016YFC0801603)
国家自然科学基金面上项目(51574123)
辽宁省自然科学基金项目(20170540456)
辽宁省创新创业训练计划专项经费资助项目(201710146000055)
关键词
工程爆破
SHPB
动荷载
岩石动态响应
Engineering blasting
SHPB
Dynamic loading
Rock dynamic response