摘要
为研究高温作用后硅质砂岩的动态力学性能,采用分离式霍普金森压杆(SHPB)装置系统对硅质砂岩在常温(25℃)以及200、400、600、800℃进行动态冲击压缩实验,研究硅质砂岩经不同高温冷却后的动态力学特性。结果表明:不同高温后硅质砂岩在动态冲击作用下压缩应力-应变曲线有明显的非线性特征;峰值应力、峰值应变与应变率之间呈正相关线性关系;200℃时对峰值应力有加强作用,后随温度的升高对峰值应力有削弱作用,800℃时削弱最明显;200℃时对峰值应变有削弱作用,后随温度的升高对峰值应变增强作用明显;在200~400℃时对弹性模量的影响不大,后随温度的升高呈下降趋势。
In order to study the dynamic mechanical properties of siliceous sandstone after high temperature action,dynamic impact compression experiments of siliceous sandstone at room temperature(25℃)and 200,400,600 and 800℃were carried out by Split Hopkinson Pressure Bar(SHPB).The results show that the compressive stress-strain curves of siliceous sandstones at different high temperatures have obvious nonlinear characteristics under dynamic impact.There is a positive correlation between peak stress,peak strain and strain rate.The peak stress is strengthened at 200℃,and weakened at 800℃with the increase of temperature.The peak strain is weakened at 200℃,and the peak strain is enhanced with the increase of temperature.It has little effect on the elastic modulus at 200~400℃,and then the temperature increased and the temperature decreased.
作者
刘少坤
李清
黄晨
LIU Shao-kun;LI Qing;HUANG Chen(China University of Mining and Technology(Beijing),Beijing 100083,China)
出处
《工程爆破》
CSCD
北大核心
2023年第3期24-30,共7页
Engineering Blasting
