不同应力波形下饱水红砂岩动力学特性
Dynamic Characteristics of Saturated Water Red Sandstone Under Different Stress Waveforms
解北京 1石嘉煜 2梁天宇 1陈铭进 1李晓旭1
作者信息
- 1. 中国矿业大学(北京)应急管理与安全工程学院,北京 100083
- 2. 中国电建集团西北勘测设计研究院有限公司,西安 710065
- 折叠
摘要
应力波幅值及能量耗散时空演化规律在冲击地压等煤岩动力灾害防治工作中往往被忽略,为研究冲击脉冲波形状对岩石的动力学特性影响,利用分离式霍普金森杆实验系统(SHPB),采用多种长度和纺锤形撞击杆(子弹)对干燥和饱和水红砂岩进行不同应变率下的动态压缩实验.结果表明:应力波持续时间对岩石的应变率和动态强度产生显著影响,当撞击杆长度大于300 mm时,应变率-时程曲线产生"双峰"现象,岩石动态强度与持续时间呈线性关系;当应变率小于300 s-1时,透射能随应变率增大而增加,当应变率大于300 s-1,撞击杆长度大于300 mm时,岩石的透射能力随应变率变大而降低;能耗率拟合曲线随应变率增大表现为先增大后降低趋势.
Abstract
The stress wave amplitude value and the space-time evolution law of energy dissipation significantly impact the rock-breaking effect,which is often neglected in preventing and controlling rock burst and coal and rock dynamic disasters.To study the impact of the shape of shock pulse on the dynamic characteristics of rocks,a split Hopkinson bar experimental system (SHPB) was used to conduct dynamic compression tests on dry and saturated red sandstone at different strain rates(128.88 s-1～711.31 s-1) using a variety of length (200,300,400,500 mm) and spindle-shaped impact bars (bullets).Based on the test results,it is found that the duration of the stress wave has a significant impact on the strain rate and dynamic strength of the rock.When the length of the impact bar is greater than 300 mm,the strain rate-time history curve has a "double peak" phenomenon,and the dynamic strength of the rock has a linear relationship with the duration.When (ε·)<300 s-1,the transmission energy increases with the increase of strain rate .When (ε·)>300 s-1 and the length of the impact rod is greater than 300 mm,the transmissivity of the rock decreases with the increase of the strain rate,while the dissipated energy increases with the increase of the strain rate.
关键词
应力波/持续时间/SHPB/动力学/红砂岩Key words
stress wave/length of time/SHPB/dynamics/red sandstone引用本文复制引用
基金项目
国家重点研发计划资助项目(2022YFC2904100)
中央高校基本科研业务费专项资金资助(2023ZKPYAQ04)
安徽省爆破器材与技术工程实验室(AHBP2022A-03)
出版年
2024
NETL
NSTL
万方数据